scholarly journals Natural variations in the non-coding region of ZmNAC080308 contributes maintaining grain yield under drought stress in maize

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Nan Wang ◽  
Ming Cheng ◽  
Yong Chen ◽  
Bojuan Liu ◽  
Xiaonan Wang ◽  
...  
Keyword(s):  
Drought Stress ◽  
Drought Tolerance ◽  
Grain Yield ◽  
Stress Condition ◽  
Genetic Recombination ◽  
Functional Marker ◽  
Coding Region ◽  
Evolutionary Selection ◽  
Drought Stress Condition ◽  
Natural Variations

Abstract Background Natural variations derived from both evolutionary selection and genetic recombination, presume to have important functions to respond to various abiotic stresses, which could be used to improve drought tolerance via genomic selection. Results In the present study, the NAC-encoding gene of ZmNAC080308 was cloned and sequenced in 199 inbred lines in maize. Phylogenetic analysis showed that ZmNAC080308 is closely clusteredinto the same group with other well-known NAC genes responding to improve drought tolerance. In total, 86 SNPs and 47 InDels were identified in the generic region of ZmNAC080308, 19 of these variations were associated with GY (grain yield) in different environments. Nine variations in the 5’-UTR region of ZmNAC080308 are closely linked, they might regulate the gene expression and respond to improve GY under drought condition via Sp1-mediated transactivation. Two haplotypes (Hap1 and Hap2) identified in the, 5’-UTR region using the nine variations, and Hap2 containing insertion variants, exhibited 15.47 % higher GY under drought stress condition. Further, a functional marker was developed to predict the drought stress tolerance in a US maize inbred line panel. Lines carrying Hap2 exhibited > 10 % higher GY than those carrying Hap1 under drought stress condition. In Arabidopsis, overexpression ZmNAC080308 enhanced drought tolerance. Conclusions ZmNAC080308 is an important gene responding to drought tolerance, a functional marker is developed for improving maize drought tolerance by selecting this gene.

scholarly journals Growth Performance and Antioxidant Enzyme Activities of Advanced Mutant Rice Genotypes under Drought Stress Condition

Agronomy ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 279 ◽  
Author(s):  
Zarifth Kamarudin ◽  
Mohd Yusop ◽  
Mahmud Tengku Muda Mohamed ◽  
Mohd Ismail ◽  
Abdul Harun
Keyword(s):  
Drought Stress ◽  
Drought Tolerance ◽  
Enzyme Activities ◽  
Stress Condition ◽  
Growth Parameters ◽  
Proline Content ◽  
Antioxidant Enzyme Activities ◽  
Drought Tolerant ◽  
Drought Stress Condition ◽  
Rice Genotypes

Drought stress affects various physiological and metabolic processes in rice (Oryza sativa L.) plant. Non-availability of high-yielding varieties suitable for cultivation under drought condition lead towards a sharp decline in rice yield. Induce mutation is an essential auxiliary approach to counterpart conventional breeding to produce stress-tolerance rice variety. The current study was aimed to identify two advanced mutant rice genotypes as drought-tolerant using growth parameters and antioxidant enzyme activities. The advanced mutant rice genotypes, MR219-4 and MR219-9, showed a minimal reduction on all growth parameters, yield, and yield components measured for drought tolerance. MR219-4 had a slight reduction on total dry weight and chlorophyll content under drought stress condition. Proline content increased significantly in drought-tolerant rice genotypes and the highest proline content was obtained from MR219-4 followed by MR219-9 under drought stress. Catalase, ascorbate peroxidase, and guaiacol peroxidase activities were significantly increased in drought stress treatment in all the rice genotypes. MR219-4 and MR219-9 were identified as high-yielding drought-tolerant genotypes as they maintained good performance under drought stress condition for all the measured traits compared to the drought-tolerant check varieties, Aeron1 and MR219, thus, this might be underlying selection criteria for a drought tolerance rice breeding programme.

scholarly journals Indole -3-acetic acid improves drought tolerance of white clover via activating auxin, abscisic acid and jasmonic acid related genes and inhibiting senescence genes

2020 ◽  
Author(s):  
Youzhi Zhang ◽  
Yaping Li ◽  
Muhammad Jawad Hassan ◽  
Zhou Li ◽  
Yan Peng
Keyword(s):  
Acetic Acid ◽  
Drought Stress ◽  
Drought Tolerance ◽  
Leaf Senescence ◽  
White Clover ◽  
Stress Condition ◽  
Drought Stress Condition ◽  
Concentration Changes ◽  
Indole 3 Acetic Acid ◽  
Exogenous Iaa

Abstract Background: Auxin may have a positive effect on plants under drought stress. White clover is widely cultivated and often prone to water shortages. In the present study, we investigated the effects of exogenous indole -3-acetic acid (IAA) on growth and physiological changes of white clover under drought stress condition. The contents of endogenous IAA and other hormones including ABA, CTK, JA, GA, IAA, and SA were assayed. Moreover, expressions of auxin-responsive genes, drought-responsive genes and leaf senescence-associated genes were detected in response to exogenous IAA. Results: Compared to control, drought stress alone significantly diminished stem dry weigh, relative water content (RWC) and total chlorophyll content (Chl). Exogenous IAA treatment significantly increased RWC and Chl, whereas L-AOPP treatment drastically decreased stem dry weight, RWC and Chl under drought stress condition. Additionally, exogenous IAA treatment significantly increased ABA content and JA content, up-regulated expression of auxin responsive genes ( GH3.1 , GH3.9 , IAA8 ), drought stress responsive genes ( bZIP11 , DREB2 , MYB14 , MYB48 , WRKY2 , WRKY56 , WRKY108715 and RD22 ), and down-regulated expressions of auxin-responding genes ( GH3.3 , GH3.6 , IAA27 ) and leaf senescence genes ( SAG101 and SAG102 ) in the presence of PEG. Contrarily, L-AOPP treatment significantly reduced contents of ABA, GA3 and JA, down-regulated expressions of GH3.1 , GH3.9 , IAA8 , bZIP11 , DREB2 , MYB14 , MYB48 , WRKY2 , WRKY56 , WRKY108715 , ERD and RD22 , and up-regulated SAG101 and SAG102 . Conclusions: Exogenous IAA improved drought tolerance of white clover possibly due to endogenous plant hormone concentration changes and modulation of genes involving in drought stress response and leaf senescence. These results provided useful information to understand mechanisms of IAA improved drought tolerance in white clover.

scholarly journals Correlation and Path Analysis of Yield Components in Rice (Oryza sativa L.) under Irrigated and Reproductive Stage Drought Stress Condition

2020 ◽  
pp. 60-68
Author(s):  
Sadia Perween ◽  
Anand Kumar ◽  
Fariha Adan ◽  
Jitesh Kumar ◽  
Prince Raj ◽  
...  
Keyword(s):  
Drought Stress ◽  
Grain Yield ◽  
Path Analysis ◽  
Stress Condition ◽  
Reproductive Stage ◽  
Yield Attributes ◽  
Drought Stress Condition ◽  
Biological Yield ◽  
Selection For ◽  
Correlation And Path Analysis

Aim: The current experiment was conducted to study correlation and path analysis among morphological traits and their contribution towards yield under irrigated and drought stress condition using forty eight diverse rice genotypes. Study Design: The experiment was studied in three replications using Randomized Block Design. Place and Duration of Study: The research was carried out during Kharif 2018 at Rice Research Farm, Bihar Agricultural University, Sabour (Bhagalpur), India. Methodology: The experiment was conducted in two different sets; irrigated and drought stress condition. The yield and yield attributes were recorded under both the conditions to conduct the correlation and path analysis. Results: The analysis of variance revealed that genotypes significantly varied in yield and yield related traits. In addition, growth and yield attributes such as effective tillers per hill, biological yield, harvest index (%) and number of fertile grains per panicle were significantly and positively correlated with grain yield per plant under irrigated as well as reproductive stage drought stress condition. It was observed that total number of grains per panicle, number of fertile grains per panicle and biological yield had high positive direct effect on grain yield per plant in both irrigated (control) as well stress condition, indicating true relationship of these characters with grain yield and direct selection for these characters will be rewarding. In rest of the characters studied, correlation was mainly due to indirect effects through component characters and hence indirect selection will lead to yield improvement in rice. Conclusion: The potential for direct and indirect selection for reproductive stage drought stress tolerance using the associated characters may be useful to the breeder to formulate appropriate breeding plans for the selection of the genotype which tolerate high temperature condition.

scholarly journals Oxidant related biochemical traits are significant indices in triticale grain yield under drought stress condition

2019 ◽  
Vol 42 (2) ◽  
pp. 111-126 ◽  
Author(s):  
Mehrnaz Riasat ◽  
Sholeh Kiani ◽  
Armin Saed-Mouchehsi ◽  
Mohamad Pessarakli
Keyword(s):  
Drought Stress ◽  
Grain Yield ◽  
Stress Condition ◽  
Biochemical Traits ◽  
Drought Stress Condition
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