Photosynthetic maintenance and heat shock protein accumulation relating to γ-aminobutyric acid (GABA)-regulated heat tolerance in creeping bentgrass (Agrostis stolonifera)

Chitosan (CTS) is a deacetylated derivative of chitin that is involved in adaptive response to abiotic stresses. However, the regulatory role of CTS in heat tolerance is still not fully understood in plants, especially in grass species. The aim of this study was to investigate whether the CTS could reduce heat-induced senescence and damage to creeping bentgrass associated with alterations in antioxidant defense, chlorophyll (Chl) metabolism, and the heat shock pathway. Plants were pretreated exogenously with or without CTS (0.1 g L−1) before being exposed to normal (23/18 °C) or high-temperature (38/33 °C) conditions for 15 days. Heat stress induced detrimental effects, including declines in leaf relative water content and photochemical efficiency, but significantly increased reactive oxygen species (ROS) accumulation, membrane lipid peroxidation, and Chl loss in leaves. The exogenous application of CTS significantly alleviated heat-induced damage in creeping bentgrass leaves by ameliorating water balance, ROS scavenging, the maintenance of Chl metabolism, and photosynthesis. Compared to untreated plants under heat stress, CTS-treated creeping bentgrass exhibited a significantly higher transcription level of genes involved in Chl biosynthesis (AsPBGD and AsCHLH), as well as a lower expression level of Chl degradation-related gene (AsPPH) and senescence-associated genes (AsSAG12, AsSAG39, Asl20, and Ash36), thus reducing leaf senescence and enhancing photosynthetic performance under heat stress. In addition, the foliar application of CTS significantly improved antioxidant enzyme activities (SOD, CAT, POD, and APX), thereby effectively reducing heat-induced oxidative damage. Furthermore, heat tolerance regulated by the CTS in creeping bentgrass was also associated with the heat shock pathway, since AsHSFA-6a and AsHSP82 were significantly up-regulated by the CTS during heat stress. The potential mechanisms of CTS-regulated thermotolerance associated with other metabolic pathways still need to be further studied in grass species.

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Pengaruh Polimorfisme Gen Heat Shock Protein 70 (HSP70) SacII terhadap Toleransi Panas Itik Lokal Sumatera Barat

Jurnal Agripet ◽

10.17969/agripet.v19i2.14876 ◽

2019 ◽

Vol 19 (2) ◽

pp. 122-128

Author(s):

Kusnadidi Subekti ◽

Dedi Duryadi Solihin ◽

Rudi Afnan ◽

Asep Gunawan ◽

Cece Sumanri

Keyword(s):

Heat Shock ◽

Gene Polymorphism ◽

Heat Shock Protein ◽

Heat Tolerance ◽

Heat Shock Protein 70 ◽

Sanger Sequencing ◽

Polymorphism Analysis ◽

Chi Square ◽

Pcr Rflp ◽

Hardy Weinberg Equilibrium

ABSTRAK. Tujuan dari penelitian ini adalah untuk mengidentifikasi pengaruh polimorfisme gen heat shock protein 70 (HSP70) terhadap sifat toleransi panas. Genotiping dilakukan pada 110 itik lokal dari 4 populasi itik Sumatera Barat (pitalah, bayang, kamang, dan payakumbuh). Enzim restriksi yang digunakan adalah SacII. Cekaman panas dilakukan selama 1 jam dengan sampel itik lokal sebanyak 24 ekor untuk menganalisa status hematologi. PCR-RFLP dan Sanger sequencing assay digunakan untuk mengidentifikasi polimorfisme. Analisis polimorfisme dilakukan dengan menggunakan Software MEGA 7 dan pengaruhnya dianalisis dengan ANOVA menggunakan software SAS 9.4. Produk amplifikasi yang dihasilkan yaitu 466 pasang basa. Lokus HSP70/SacII mengenali satu situs SNP (Single nucleotide Polymorphism) g.1702TC, menghasilkan dua alel (T dan C) dan tiga genotype (TT, TC, CC). Gen HSP70/SacII bersifat polimorfik pada semua populasi. Hasil penelitian menunjukkan bahwa alel T memiliki frekuensi yang lebih tinggi daripada alel C pada semua populasi. Analisis chi-kuadrat (χ2) menunjukkan bahwa semua populasi itik lokal memenuhi kaidah kesetimbangan Hardy-Weinberg. Pengaruh genotipe gen HSP70 terhadap status hematologi menunjukkan perbedaan (P0,05) terhadap nilai heterofil dan nilai H/L dengan genotipe CT menunjukkan toleransi panas yang lebih baik dibanding genotipe lainnya. Gen HSP70/SacII dapat dijadikan marka molekuler sifat toleransi panas pada itik lokal berdasarkan keragaman dan pengaruhnya terhadap status hematologi. (The effect of heat shock protein 70 (HSP70) SacII gene polymorphism on heat tolerance of West Sumatera local duck) ABSTRACT. The objective of this study was to identify the effect of HSP70/SacII gene polymorphism associated with the thermotolerance trait. Genotyping was performed on 110 local duck from the West Sumatera ducks population (pitalah, bayang, kamang, and payakumbuh). The restriction enzyme used was SacII. Heat stress was done for 1 hour with samples used as much as 24 birds to analyze hematological status. PCR-RFLP and Sanger sequencing assays were used to identify polymorphism. Analysis of polymorphism was conduct by MEGA 7 software and its effect is analyzed with ANOVA using Statistical SAS 9.4 software. The product of amplification was 466 bp. HSP70/SacII recognized one SNP g.1702TC, producing two alleles (T and C) and three genotypes (TT,TC,CC). The HSP70/SacII locus were polymorphic in all population. T allele had a higher frequency than C allele in all populations. The analysis of chi-square (χ2) showed that all local ducks population were fit with Hardy-Weinberg equilibrium. The effect of HSP70/SacII gene on hematological status showed differences (P0,05) of heterophil and H/L ratio with CT genotype show better heat tolerance than other genotypes. HSP70/SacII gene can be used as a marker of heat tolerance in local ducks based on polymorphism and its effect on hematological status.

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Transcript abundance of heat shock protein genes confer heat tolerance in cotton (Gossypium hirsutum L.)

Pakistan Journal of Botany ◽

10.30848/pjb2022-1(21) ◽

2021 ◽

Vol 54 (1) ◽

Author(s):

Muhammad Majid Ali ◽

Zulfiqar Ali ◽

Furqan Ahmad ◽

Fahim Nawaz ◽

Qamar Shakil ◽

...

Keyword(s):

Heat Shock ◽

Heat Shock Protein ◽

Gossypium Hirsutum ◽

Heat Tolerance ◽

Transcript Abundance ◽

Gossypium Hirsutum L ◽

Heat Shock Protein Genes

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Induction of Heat Shock Protein Genes is the Hallmark of Egg Heat Tolerance in Agasicles hygrophila (Coleoptera: Chrysomelidae)

Journal of Economic Entomology ◽

10.1093/jee/toaa105 ◽

2020 ◽

Vol 113 (4) ◽

pp. 1972-1981

Author(s):

Dong Jia ◽

Yan-Hong Liu ◽

Bin Zhang ◽

Zhou-Yu Ji ◽

Yuan-Xin Wang ◽

...

Keyword(s):

Gene Expression ◽

Heat Shock ◽

Heat Shock Protein ◽

High Temperatures ◽

Heat Tolerance ◽

Invasive Plant ◽

Alternanthera Philoxeroides ◽

Alligator Weed ◽

Natural Habitats ◽

Hsp Genes

Abstract Insects are ecotothermic organisms. Their development, survival, reproduction as well as distribution and abundance are affected by temperature. Heat shock protein (HSP) gene expression is closely associated with temperature variation and influences the adaptation of organisms to adverse environments. The beetle Agasicles hygrophila has successfully been used for biological control of the invasive plant alligator weed (Alternanthera philoxeroides). As A. hygrophila populations are substantially inhibited by high temperatures in the summer, increasing global temperatures may limit the efficacy of this control agent. We previously established that A. hygrophila eggs have low tolerance to heat and this factored into the decreased numbers of A. hygrophila beetles at temperatures of 37.5°C and above. Here, we identified 26 HSP genes in A. hygrophila and examined the relationship between the transcript levels of these genes and heat tolerance. The temperature at which the expression of these 21 HSP genes peaked (Tpeak) was 37.5°C, which is in line with the limit of the high temperatures that A. hygrophila eggs tolerate. Therefore, we speculate that the Tpeak of HSP gene expression in eggs indicates the upper limit of temperatures that A. hygrophila eggs tolerate. This study identifies HSP genes as potential robust biomarkers and emphasizes that determining species’ heat tolerance in their natural habitats remains an important consideration for biocontrol. HSP gene expression data provide information about a species’ heat tolerance and may be used to predict its geographical distribution.

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