scholarly journals Transcriptomic responses to thermal stress and varied phosphorus conditions in Symbiodinium kawagutii

2018 ◽  
Author(s):  
Liying Yu ◽  
Senjie Lin ◽  
Huan Zhang
Keyword(s):  
Cell Wall ◽  
Catalytic Activity ◽  
Heat Stress ◽  
Thermal Stress ◽  
Molecular Mechanisms ◽  
Bioinformatic Analysis ◽  
Rna Seq ◽  
Significant Differential Expression ◽  
Phosphate Deprivation ◽  
Transcriptomic Responses

Symbiodinium species are essential symbionts of tropical reef-building corals and the disruption of their symbiosis with corals as a consequence of seawater warming and other stress conditions leads to the globally widespread coral bleaching. As coral reefs live in the oligotrophic environment, Symbiodinium photosynthesis can also face nutrient stress. How metabolic pathways in Symbiodinium respond to thermal stress and phosphate depletion is poorly understood and underexplored for many species. Here we conducted RNA-seq analysis to investigate transcriptomic responses to thermal stress, phosphate deprivation and glycerol-3-phosphate (Gro3P) replacement in S. kawagutii. RNA-seq and bioinformatic analysis were conducted for the above-mentioned three treatments and a control. We identified 221 (2.04%) genes showing no significant differential expression among all conditions, and defined them as “core” genes of S. kawagutii, which mostly were in the Gene Ontology terms of catalytic activity and binding. Using algorithms edgeR and NOIseq in combination, we identified a set of differentially expressed genes (DEGs) for each treatment relative to the control. Under heat stress 357 (4.42%) DEGs were found, with predicted roles in active molecular (protein-protein/RNA/DNA) interaction, cell wall modulation and transport (including nutrients, iron, and oxygen). About as many DEGs (396, 4.73%) were identified under P deprivation while nearly double of that (671, 8.05%) were detected under Gro3P utilization; in both cases most of the DEGs were up-regulated and predicted to function in photosystem and defensome. Further KEGG pathway comparison revealed different molecular responses between phosphate deprivation and Gro3P utilization. Catalytic activity and binding seem to be two important core functions in S. kawagutii. The most significant transcriptional response in S. kawagutii to heat stress was regulation of molecular interaction, cell wall modulation, and transport of iron, oxygen, and major nutrients, suggesting that this species uses a unique mechanism to cope with heat stress, possibly conferring thermal tolerance. The greatest transcriptomic impact of phosphate deprivation and Gro3P replacement were the up-regulation of photosystem and defense. This study provides new clues about molecular mechanisms underpinning responses in Symbiodinium to temperature and nutrient stresses, which will generate new hypotheses and set a new framework for future investigations.

scholarly journals Transcriptomic Responses to Thermal Stress and Varied Phosphorus Conditions in Fugacium kawagutii

2019 ◽  
Vol 7 (4) ◽  
pp. 96 ◽  
Author(s):  
Senjie Lin ◽  
Liying Yu ◽  
Huan Zhang
Keyword(s):  
Heat Stress ◽  
Thermal Stress ◽  
Molecular Mechanisms ◽  
Organic Phosphorus ◽  
Phosphorus Deficiency ◽  
Dual Algorithm ◽  
Quantitative Expression ◽  
Wide Range ◽  
Transcriptomic Responses ◽  
Major Nutrients

Coral reef-associated Symbiodiniaceae live in tropical and oligotrophic environments and are prone to heat and nutrient stress. How their metabolic pathways respond to pulses of warming and phosphorus (P) depletion is underexplored. Here, we conducted RNA-seq analysis to investigate transcriptomic responses to thermal stress, phosphate deprivation, and organic phosphorus (OP) replacement in Fugacium kawagutii. Using dual-algorithm (edgeR and NOIseq) to remedy the problem of no replicates, we conservatively found 357 differentially expressed genes (DEGs) under heat stress, potentially regulating cell wall modulation and the transport of iron, oxygen, and major nutrients. About 396 DEGs were detected under P deprivation and 671 under OP utilization, both mostly up-regulated and potentially involved in photosystem and defensome, despite different KEGG pathway enrichments. Additionally, we identified 221 genes that showed relatively stable expression levels across all conditions (likely core genes), mostly catalytic and binding proteins. This study reveals a wide range of, and in many cases previously unrecognized, molecular mechanisms in F. kawagutii to cope with heat stress and phosphorus-deficiency stress. Their quantitative expression dynamics, however, requires further verification with triplicated experiments, and the data reported here only provide clues for generating testable hypotheses about molecular mechanisms underpinning responses and adaptation in F. kawagutii to temperature and nutrient stresses.

scholarly journals Transcriptomic responses to environmental change in fishes: Insights from RNA sequencing

FACETS ◽  
2017 ◽  
Vol 2 (2) ◽  
pp. 610-641 ◽  
Author(s):  
Rebekah A. Oomen ◽  
Jeffrey A. Hutchings
Keyword(s):  
Climate Change ◽  
Rna Sequencing ◽  
Molecular Mechanisms ◽  
Environmental Variability ◽  
Global Climate ◽  
Genetic Research ◽  
Model Organisms ◽  
Rna Seq ◽  
Transcriptomic Responses ◽  
Ecological Importance

The need to better understand how plasticity and evolution affect organismal responses to environmental variability is paramount in the face of global climate change. The potential for using RNA sequencing (RNA-seq) to study complex responses by non-model organisms to the environment is evident in a rapidly growing body of literature. This is particularly true of fishes for which research has been motivated by their ecological importance, socioeconomic value, and increased use as model species for medical and genetic research. Here, we review studies that have used RNA-seq to study transcriptomic responses to continuous abiotic variables to which fishes have likely evolved a response and that are predicted to be affected by climate change (e.g., salinity, temperature, dissolved oxygen concentration, and pH). Field and laboratory experiments demonstrate the potential for individuals to respond plastically to short- and long-term environmental stress and reveal molecular mechanisms underlying developmental and transgenerational plasticity, as well as adaptation to different environmental regimes. We discuss experimental, analytical, and conceptual issues that have arisen from this work and suggest avenues for future study.

scholarly journals Antioxidant Enzymes and Heat Shock Protein Genes from Liposcelis bostrychophila Are Involved in Stress Defense upon Heat Shock

Insects ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 839
Author(s):  
Ze Qing Miao ◽  
Yan Qing Tu ◽  
Peng Yu Guo ◽  
Wang He ◽  
Tian Xing Jing ◽  
...  
Keyword(s):  
Antioxidant Enzymes ◽  
Heat Stress ◽  
Thermal Stress ◽  
Heat Shock ◽  
Oxidative Damage ◽  
High Temperatures ◽  
Defense Mechanisms ◽  
Molecular Mechanisms ◽  
Instar Nymph ◽  
Liposcelis Bostrychophila

Psocids are a new risk for global food security and safety because they are significant worldwide pests of stored products. Among these psocids, Liposcelis bostrychophila has developed high levels of resistance or tolerance to heat treatment in grain storage systems, and thus has led to investigation of molecular mechanisms underlying heat tolerance in this pest. In this study, the time-related effects of thermal stress treatments at relatively high temperatures on the activities of antioxidant enzymes, including superoxide dismutase (SOD), catalase (CAT), peroxidases (POD), glutathione-S-transferases (GST) and malondialdehyde (MDA), of L. bostrychophila were determined. Thermal stress resulted that L. bostrychophila had a significantly higher MDA concentration at 42.5 °C, which indicated that the heat stress increased lipid peroxidation (LPO) contents and oxidative stress in this psocid pest. Heat stress also resulted in significant elevation of SOD, CAT and GST activities but decreased POD activity. Our data indicates that different antioxidant enzymes contribute to defense mechanisms, counteracting oxidative damage in varying levels. POD play minor roles in scavenging deleterious LPO, while enhanced SOD, CAT and GST activities in response to thermal stress likely play a more important role against oxidative damage. Here, we firstly identified five LbHsps (four LbHsp70s and one LbHsp110) from psocids, and most of these LbHsps (except LbHsp70-1) are highly expressed at fourth instar nymph and adults, and LbHsp70-1 likely presents as a cognate form of HSP due to its non-significant changes of expression. Most LbHsp70s (except LbHsp70-4) are significantly induced at moderate high temperatures (<40 °C) and decreased at extreme high temperatures (40–45 °C), but LbHsp110-1 can be significantly induced at all high temperatures. Results of this study suggest that the LbHsp70s and LbHsp110 genes are involved in tolerance to thermal stress in L. bostrychophila, and antioxidant enzymes and heat shock proteins may be coordinately involved in the tolerance to thermal stress in psocids.

Molecular mechanisms for magnesium-deficiency-induced leaf vein lignification, enlargement and cracking in Citrus sinensis revealed by RNA-Seq

2020 ◽  
Author(s):  
Xin Ye ◽  
Hui-Yu Huang ◽  
Feng-Lin Wu ◽  
Li-Ya Cai ◽  
Ning-Wei Lai ◽  
...  
Keyword(s):  
Cell Wall ◽  
Citrus Sinensis ◽  
Molecular Mechanisms ◽  
Magnesium Deficiency ◽  
Lignin Biosynthesis ◽  
Common Elements ◽  
Rna Seq ◽  
Transcript Levels ◽  
Mg Deficiency ◽  
Leaf Vein

Abstract Citrus sinensis (L.) Osbeck seedlings were fertigated with nutrient solution containing 2 [magnesium (Mg)-sufficiency] or 0 mM (Mg-deficiency) Mg(NO3)2 for 16 weeks. Thereafter, RNA-Seq was used to investigate Mg-deficiency-responsive genes in the veins of upper and lower leaves in order to understand the molecular mechanisms for Mg-deficiency-induced vein lignification, enlargement and cracking, which appeared only in the lower leaves. In this study, 3065 upregulated and 1220 downregulated, and 1390 upregulated and 375 downregulated genes were identified in Mg-deficiency veins of lower leaves (MDVLL) vs Mg-sufficiency veins of lower leaves (MSVLL) and Mg-deficiency veins of upper leaves (MDVUL) vs Mg-sufficiency veins of upper leaves (MSVUL), respectively. There were 1473 common differentially expressed genes (DEGs) between MDVLL vs MSVLL and MDVUL vs MSVUL, 1463 of which displayed the same expression trend. Magnesium-deficiency-induced lignification, enlargement and cracking in veins of lower leaves might be related to the following factors: (i) numerous transciption factors and genes involved in lignin biosynthesis pathways, regulation of cell cycle and cell wall metabolism were upregulated; and (ii) reactive oxygen species, phytohormone and cell wall integrity signalings were activated. Conjoint analysis of proteome and transcriptome indicated that there were 287 and 56 common elements between DEGs and differentially abundant proteins (DAPs) identified in MDVLL vs MSVLL and MDVUL vs MSVUL, respectively, and that among these common elements, the abundances of 198 and 55 DAPs matched well with the transcript levels of the corresponding DEGs in MDVLL vs MSVLL and MDVUL vs MSVUL, respectively, indicating the existence of concordances between protein and transcript levels.

scholarly journals Tissue-Specific Transcriptome Analysis Reveals Lignocellulose Synthesis Regulation in Elephant Grass (Pennisetum purpureum Schum.)

2020 ◽  
Author(s):  
Wenqing Zhang ◽  
Shengkui Zhang ◽  
Xianqin Lu ◽  
Can Li ◽  
Xingwang Liu ◽  
...  
Keyword(s):  
Cell Wall ◽  
Candidate Genes ◽  
Molecular Mechanisms ◽  
Developmental Stages ◽  
Lignin Content ◽  
Pennisetum Purpureum ◽  
Cellulose Synthesis ◽  
Elephant Grass ◽  
Rna Seq ◽  
Lignin Synthesis

Abstract Background: The characteristics of elephant grass, especially its stem lignocellulose, are of great significance for its quality as feed or other industrial raw materials. However, the research on lignocellulose biosynthesis pathway and key genes is limited because the genome of elephant grass has not been deciphered.Results: In this study, RNA sequencing (RNA-seq) combined with lignocellulose content analysis and cell wall morphology observation using elephant grass stems from different development stages as materials were applied to reveal the genes that regulate the synthesis of cellulose and lignin. A total of 3852 differentially expressed genes (DEGs) were identified in three periods of T1, T2, and T3 through RNA-seq analysis. Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis of all DEGs showed that the two most abundant metabolic pathways were phenylpropane metabolism, starch and sucrose metabolism, which were closely related to cell wall development, hemicellulose, lignin and cellulose synthesis. Through weighted gene co-expression network analysis (WGCNA) of DEGs, a ‘blue’ module highly associated with cellulose synthesis and a ‘turquoise’ module highly correlated with lignin synthesis were exhibited. A total of 43 candidate genes were screened, of which 17 had function annotations in other species. Besides, by analyzing the content of lignocellulose in the stem tissues of elephant grass at different developmental stages and the expression levels of genes such as CesA, PAL, CAD, C4H, COMT, CCoAMT, F5H and CCR, it was found that the content of lignocellulose was related to the expression level of these structural genes.Conclusions: This study provides a basis for further understanding the molecular mechanisms of cellulose and lignin synthesis pathways of elephant grass, and offers a unique and extensive list of candidate genes for future specialized functional studies which may promote the development of high-quality elephant grass varieties with high cellulose and low lignin content.

scholarly journals Bioinformatic analysis deciphers the molecular toolbox in the endophytic/pathogenic behaviour in F. oxysporum f. sp. vanillae - V. planifolia Jacks interaction

2021 ◽  
Author(s):  
Marco Tulio Solano De la Cruz ◽  
Esteban Elías Escobar Hernández ◽  
Jorge Arturo Arciniega González ◽  
Rocío Del Pilar Rueda Zozaya ◽  
Mauricio Luna Rodríguez ◽  
...  
Keyword(s):  
Metabolic Pathways ◽  
Molecular Mechanisms ◽  
De Novo ◽  
Behavioral Genetics ◽  
Fusaric Acid ◽  
Bioinformatic Analysis ◽  
Rna Seq ◽  
Independent Manner ◽  
Underlying Mechanisms ◽  
Genomic Regions

Background: F. oxysporum as a species complex (FOSC) possess the capacity, to specialize into host-specific pathogens deriving into formae speciales. This with the help of horizontal gene transfer (HGT) between pathogenic and endophytic individuals of FOSC. From these pathogenic forma speciales, F. oxysporum f. sp. vanillae (Fov) is the causal agent of fusarium wilt producing root and stem rot (RSR) positions itself was the main phytosanitary problem in vanilla plantations worldwide. Nonetheless, the origin of this forma specialis and the behavioral genetics dictating the endophytic/pathogenic Fusarium lifestyles are still unknown. To elucidate the underlying molecular mechanisms that establish these behaviors we analyzed the RNA-seq libraries of two-times frames of vanilla-fov interactions. Results: Our analyses identified the sets of transcripts corresponding to Fov pathogenic strain JAGH3 during the two-times frames of the infection as the sets of the transcripts belonging to endophytic Fox in vanilla. Functional predictions of de novo annotated transcripts as the enriched GO terms with the overrepresented metabolic pathways associated to them allowed us to identify the molecular processes that establish the pathogenic lifestyle in Fov being virulence, hypervirulence, sporulation, conidiation, necrosis and fusaric acid related genes with the carbohydrates, amino acids and proteins, glycerophospholipids and autophagy metabolic pathways that are key regulators of spores germination and pathogenicity establishment as the underlying mechanisms behind this behavior. As the absence of these were found in the vanilla endophytic Fox. Conclusions: This work reveals the main players of the behavioral genetics in pathogenic Fov/endophytic Fox in V. planifolia Jacks. Its pathogenic strategy allows Fov to infect in a SIX genes-independent manner. As the other pathogenic elements found in this study could be explained by the presence of pathogenicity islands and genomic regions associated with supernumerary chromosomes in Fov. These play a central role as carriers of genes involved with pathogenic activity and can be obtained through HGT.

scholarly journals Tissue-Specific Transcriptome Analysis Reveals Lignocellulose Synthesis Regulation in Elephant Grass (Pennisetum purpureum Schum.)

2020 ◽  
Author(s):  
Wenqing Zhang ◽  
Shengkui Zhang ◽  
Xianqin Lu ◽  
Can Li ◽  
Xingwang Liu ◽  
...  
Keyword(s):  
Cell Wall ◽  
Candidate Genes ◽  
Molecular Mechanisms ◽  
Developmental Stages ◽  
Lignin Content ◽  
Pennisetum Purpureum ◽  
Cellulose Synthesis ◽  
Elephant Grass ◽  
Rna Seq ◽  
Lignin Synthesis

Abstract Background: The characteristics of elephant grass, especially its stem lignocellulose, are of great significance for its quality as feed or other industrial raw materials. However, the research on lignocellulose biosynthesis pathway and key genes is limited because the genome of elephant grass has not been deciphered.Results: In this study, RNA sequencing (RNA-seq) combined with lignocellulose content analysis and cell wall morphology observation using elephant grass stems from different development stages as materials were applied to reveal the genes that regulate the synthesis of cellulose and lignin. A total of 3852 differentially expressed genes (DEGs) were identified in three periods of T1, T2, and T3 through RNA-seq analysis. Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis of all DEGs showed that the two most abundant metabolic pathways were phenylpropane metabolism, starch and sucrose metabolism, which were closely related to cell wall development, hemicellulose, lignin and cellulose synthesis. Through weighted gene co-expression network analysis (WGCNA) of DEGs, a ‘blue’ module highly associated with cellulose synthesis and a ‘turquoise’ module highly correlated with lignin synthesis were exhibited. A total of 43 candidate genes were screened, of which 17 had function annotations in other species. Besides, by analyzing the content of lignocellulose in the stem tissues of elephant grass at different developmental stages and the expression levels of genes such as CesA, PAL, CAD, C4H, COMT, CCoAMT, F5H and CCR, it was found that the content of lignocellulose was related to the expression level of these structural genes.Conclusions: This study provides a basis for further understanding the molecular mechanisms of cellulose and lignin synthesis pathways of elephant grass, and offers a unique and extensive list of candidate genes for future specialized functional studies which may promote the development of high-quality elephant grass varieties with high cellulose and low lignin content.

scholarly journals Tissue-Specific Transcriptome Analysis Reveals Lignocellulose Synthesis Regulation in Elephant Grass (Pennisetum purpureum Schum.)

2020 ◽  
Author(s):  
Wenqing Zhang ◽  
Shengkui Zhang ◽  
Xianqin Lu ◽  
Can Li ◽  
Xingwang Liu ◽  
...  
Keyword(s):  
Cell Wall ◽  
Candidate Genes ◽  
Molecular Mechanisms ◽  
Developmental Stages ◽  
Lignin Content ◽  
Pennisetum Purpureum ◽  
Cellulose Synthesis ◽  
Elephant Grass ◽  
Rna Seq ◽  
Lignin Synthesis

Abstract Background: The characteristics of elephant grass, especially its stem lignocellulose, are of great significance for its quality as feed or other industrial raw materials. However, the research on lignocellulose biosynthesis pathway and key genes is limited because the genome of elephant grass has not been deciphered.Results: In this study, RNA sequencing (RNA-seq) combined with lignocellulose content analysis and cell wall morphology observation using elephant grass stems from different development stages as materials were applied to reveal the genes that regulate the synthesis of cellulose and lignin. A total of 3852 differentially expressed genes (DEGs) were identified in three periods of T1, T2, and T3 through RNA-seq analysis. Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis of all DEGs showed that the two most abundant metabolic pathways were phenylpropane metabolism, starch and sucrose metabolism, which were closely related to cell wall development, hemicellulose, lignin and cellulose synthesis. Through weighted gene co-expression network analysis (WGCNA) of DEGs, a ‘blue’ module highly associated with cellulose synthesis and a ‘turquoise’ module highly correlated with lignin synthesis were exhibited. A total of 43 candidate genes were screened, of which 17 had function annotations in other species. Besides, by analyzing the content of lignocellulose in the stem tissues of elephant grass at different developmental stages and the expression levels of genes such as CesA, PAL, CAD, C4H, COMT, CCoAMT, F5H and CCR, it was found that the content of lignocellulose was related to the expression level of these structural genes.Conclusions: This study provides a basis for further understanding the molecular mechanisms of cellulose and lignin synthesis pathways of elephant grass, and offers a unique and extensive list of candidate genes for future specialized functional studies which may promote the development of high-quality elephant grass varieties with high cellulose and low lignin content.

scholarly journals Tissue-Specific Transcriptome Analysis Reveals Lignocellulose Synthesis Regulation in Elephant Grass (Pennisetum purpureum Schum.)

2020 ◽  
Author(s):  
Wenqing Zhang ◽  
Shengkui Zhang ◽  
Xianqin Lu ◽  
Can Li ◽  
Xingwang Liu ◽  
...  
Keyword(s):  
Cell Wall ◽  
Candidate Genes ◽  
Molecular Mechanisms ◽  
Developmental Stages ◽  
Lignin Content ◽  
Pennisetum Purpureum ◽  
Cellulose Synthesis ◽  
Elephant Grass ◽  
Rna Seq ◽  
Lignin Synthesis

Abstract Background: The characteristics of elephant grass, especially its stem lignocellulose, are of great significance for its quality as feed or other industrial raw materials. However, the research on lignocellulose biosynthesis pathway and key genes is limited because the genome of elephant grass has not been deciphered.Results: In this study, RNA sequencing (RNA-seq) combined with lignocellulose content analysis and cell wall morphology observation using elephant grass stems from different development stages as materials were applied to reveal the genes that regulate the synthesis of cellulose and lignin. A total of 3852 differentially expressed genes (DEGs) were identified in three periods of T1, T2, and T3 through RNA-seq analysis. Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis of all DEGs showed that the two most abundant metabolic pathways were phenylpropane metabolism, starch and sucrose metabolism, which were closely related to cell wall development, hemicellulose, lignin and cellulose synthesis. Through weighted gene co-expression network analysis (WGCNA) of DEGs, a ‘blue’ module highly associated with cellulose synthesis and a ‘turquoise’ module highly correlated with lignin synthesis were exhibited. A total of 43 candidate genes were screened, of which 17 had function annotations in other species. Besides, by analyzing the content of lignocellulose in the stem tissues of elephant grass at different developmental stages and the expression levels of genes such as CesA, PAL, CAD, C4H, COMT, CCoAMT, F5H and CCR, it was found that the content of lignocellulose was related to the expression level of these structural genes.Conclusions: This study provides a basis for further understanding the molecular mechanisms of cellulose and lignin synthesis pathways of elephant grass, and offers a unique and extensive list of candidate genes for future specialized functional studies which may promote the development of high-quality elephant grass varieties with high cellulose and low lignin content.

scholarly journals Identification of Candidate Genes Involved in Fruit Ripening and Crispness Retention Through Transcriptome Analyses of a ‘Honeycrisp’ Population

Plants ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 1335
Author(s):  
Hsueh-Yuan Chang ◽  
Cindy B. S. Tong
Keyword(s):  
Cell Wall ◽  
Fruit Ripening ◽  
Molecular Mechanisms ◽  
Expression Patterns ◽  
Differentially Expressed ◽  
Rna Seq ◽  
Phenotypic Differences ◽  
Genes Encoding ◽  
A Cell ◽  
Phenotypic Groups

Crispness retention is a postharvest trait that fruit of the ’Honeycrisp’ apple and some of its progeny possess. To investigate the molecular mechanisms of crispness retention, progeny individuals derived from a ’Honeycrisp’ × MN1764 population with fruit that either retain crispness (named “Retain”), lose crispness (named “Lose”), or that are not crisp at harvest (named “Non-crisp”) were selected for transcriptomic comparisons. Differentially expressed genes (DEGs) were identified using RNA-Seq, and the expression levels of the DEGs were validated using nCounter®. Functional annotation of the DEGs revealed distinct ripening behaviors between fruit of the “Retain” and “Non-crisp” individuals, characterized by opposing expression patterns of auxin- and ethylene-related genes. However, both types of genes were highly expressed in the fruit of “Lose” individuals and ’Honeycrisp’, which led to the potential involvements of genes encoding auxin-conjugating enzyme (GH3), ubiquitin ligase (ETO), and jasmonate O-methyltransferase (JMT) in regulating fruit ripening. Cell wall-related genes also differentiated the phenotypic groups; greater numbers of cell wall synthesis genes were highly expressed in fruit of the “Retain” individuals and ’Honeycrisp’ when compared with “Non-crisp” individuals and MN1764. On the other hand, the phenotypic differences between fruit of the “Retain” and “Lose” individuals could be attributed to the functioning of fewer cell wall-modifying genes. A cell wall-modifying gene, MdXTH, was consistently identified as differentially expressed in those fruit over two years in this study, so is a major candidate for crispness retention.

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