scholarly journals Leaf Senescence in Wheat: A Drought Tolerance Measure

2020 ◽  
Author(s):  
Hafsi Miloud ◽  
Guendouz Ali
Keyword(s):  
Drought Tolerance ◽  
Leaf Senescence

Roles of potential plant hormones and transcription factors in controlling leaf senescence and drought tolerance

PROTOPLASMA ◽  
2018 ◽  
Vol 256 (2) ◽  
pp. 313-329 ◽  
Author(s):  
Sumira Jan ◽  
Nazia Abbas ◽  
Muhammad Ashraf ◽  
Parvaiz Ahmad
Keyword(s):  
Transcription Factors ◽  
Drought Tolerance ◽  
Leaf Senescence ◽  
Plant Hormones

scholarly journals GmNAC81 Inversely Modulates Leaf Senescence and Drought Tolerance

2020 ◽  
Vol 11 ◽  
Author(s):  
Dalton O. Ferreira ◽  
Otto T. Fraga ◽  
Maiana R. Pimenta ◽  
Hanna D. N. Caetano ◽  
João Paulo B. Machado ◽  
...  
Keyword(s):  
Cell Death ◽  
Drought Tolerance ◽  
Leaf Senescence ◽  
Control Line ◽  
Aba Signaling ◽  
Downstream Effector ◽  
Relative Water ◽  
Cell Death Program ◽  
Transgenic Lines ◽  
Increased Sensitivity

Glycine max NAC81 (GmNAC81) is a downstream effector of the DCD/NRP-mediated cell death signaling, which interacts with GmNAC30 to fully induce the caspase 1-like vacuolar processing enzyme (VPE) expression, the executioner of the cell death program. GmNAC81 has been previously shown to positively modulate leaf senescence via the NRP/GmNAC81/VPE signaling module. Here, we examined the transcriptome induced by GmNAC81 overexpression and leaf senescence and showed that GmNAC81 further modulates leaf senescence by regulating an extensive repertoire of functionally characterized senescence-associated genes (SAGs). Because the NRP/GmNAC81/VPE signaling circuit also relays stress-induced cell death signals, we examined the effect of GmNAC81 overexpression in drought responses. Enhanced GmNAC81 expression in the transgenic lines increased sensitivity to water deprivation. Under progressive drought, the GmNAC81-overexpressing lines displayed severe leaf wilting, a larger and faster decline in leaf Ψw, relative water content (RWC), photosynthesis rate, stomatal conductance, and transpiration rate, in addition to higher Ci/Ca and lower Fm/Fv ratios compared to the BR16 control line. Collectively, these results indicate that the photosynthetic activity and apparatus were more affected by drought in the transgenic lines. Consistent with hypersensitivity to drought, chlorophyll loss, and lipid peroxidation were higher in the GmNAC81-overexpressing lines than in BR16 under dehydration. In addition to inducing VPE expression, GmNAC81 overexpression uncovered the regulation of typical drought-responsive genes. In particular, key regulators and effectors of ABA signaling were suppressed by GmNAC81 overexpression. These results suggest that GmNAC81 may negatively control drought tolerance not only via VPE activation but also via suppression of ABA signaling.

scholarly journals The ER luminal binding protein (BiP) mediates an increase in drought tolerance in soybean and delays drought-induced leaf senescence in soybean and tobacco

2008 ◽  
Vol 60 (2) ◽  
pp. 533-546 ◽  
Author(s):  
Maria Anete S. Valente ◽  
Jerusa A. Q. A. Faria ◽  
Juliana R. L. Soares-Ramos ◽  
Pedro A. B. Reis ◽  
Guilherme L. Pinheiro ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Leaf Senescence ◽  
Binding Protein

scholarly journals Delayed leaf senescence induces extreme drought tolerance in a flowering plant

2007 ◽  
Vol 104 (49) ◽  
pp. 19631-19636 ◽  
Author(s):  
R. M. Rivero ◽  
M. Kojima ◽  
A. Gepstein ◽  
H. Sakakibara ◽  
R. Mittler ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Leaf Senescence ◽  
Extreme Drought ◽  
Flowering Plant

The heterologous expression of CmBBX22 delays leaf senescence and improves drought tolerance in Arabidopsis

2018 ◽  
Vol 38 (1) ◽  
pp. 15-24 ◽  
Author(s):  
Yanan Liu ◽  
Hong Chen ◽  
Qi Ping ◽  
Zixin Zhang ◽  
Zhiyong Guan ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Heterologous Expression ◽  
Leaf Senescence

scholarly journals Delayed leaf senescence induces extreme drought tolerance in crop plants

2009 ◽  
Vol 153 (2) ◽  
pp. S188
Author(s):  
Eduardo Blumwald ◽  
Rosa M. Rivero ◽  
Harkamal Wadia ◽  
Zvika Peleg ◽  
Mark Szczerba ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Leaf Senescence ◽  
Crop Plants ◽  
Extreme Drought

Genetic studies for drought tolerance under contrasting moisture regimes in rice (Oryza sativa L.)

2020 ◽  
Vol 57 (2) ◽  
pp. 108-115
Author(s):  
D Shoba ◽  
S Robin ◽  
P Jeyaprakash ◽  
M Arumugam Pillai
Keyword(s):  
Drought Tolerance ◽  
Grain Yield ◽  
Plant Height ◽  
Leaf Senescence ◽  
Oryza Sativa L ◽  
Flowering Plant ◽  
Genetic Advance ◽  
Leaf Rolling ◽  
Panicle Length ◽  
Stress Regime

Twenty six genotypes and four check varieties were studied for drought tolerance in rice. The experiment was conducted under both irrigated and stress regimes. Ten different drought tolerant contributing traits were evaluated under stress regime and five yield contributing traits were evaluated under irrigated regime. Among the studied genotypes, IR 87651-26-1-1-3 possessed desirable mean performance under stress for grain yield with other studied traits except number of panicles per plant. Under irrigated regime, the genotypes IR 87753-13-1-1-3, IR 87638-10-1-1-3, IR 87759-5-2-1-3 and IR 83381-B-B-137-3 were advantageous for grain yield and other studied traits except number of panicles per plant. From the variability studies under stress, the traits viz., leaf rolling, leaf senescence, leaf drying, panicle exsertion and grain yield exhibited high genetic advance indicated additive gene action and selection is desirable for these traits. High heritability with advantageous genetic advance was recorded for plant height and grain yield under non-stress regime. From the association analysis, grain yield had positive correlation with plant height, number of panicles per plant and panicle length and negative correlation with days to fifty per cent flowering, leaf rolling, leaf senescence, leaf drying and panicle exsertion under stress. Grain yield was positively correlated with days to fifty per cent flowering, plant height and panicle length under non stress. The desirable genotypes recognized from this study may be utilized as donors and the desirable traits identified may be exploited for drought tolerance rice breeding programs.

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 Evaluation of Quality Protein Maize and Drought Tolerant Maize in Far Western Hills of Nepal

2015 ◽  
Vol 3 (3) ◽  
pp. 387-391
Author(s):  
Hari Kumar Prasai ◽  
Subarna Sharma ◽  
Ujjawal Kumar Singh Kushwaha ◽  
Jiban Shrestha
Keyword(s):  
Drought Tolerance ◽  
Grain Yield ◽  
Plant Height ◽  
Leaf Senescence ◽  
Quality Protein Maize ◽  
Research Station ◽  
Maize Genotypes ◽  
Significant Difference ◽  
Ear Height ◽  
Selection Of

The coordinated varietal trial of quality protein maize was carried out in research station of regional agricultural research station, Doti during 2011/12 and 2012/13. A total of fourteen entries including standard and local checks were included in the experiment of both years. Out of tested entries of the year 2011/12, S99TLYQ-A produced the highest grain yield (2814 kg/ha) followed by SO3TLYQ-AB-01 (2765 kg/ha) and SO3TLYQ-AB-02 (2293 kg/ha). MSTATC software was used in data analysis. Flowering days, plant height and grain yield due to genotypes was found significant at 1-5% level. Amongst the tested entries include in the experiment of the year 2012/13, S99TLYQ-AB recorded the highest grain yield (6006 kg/ha) followed by SO3TLYQ-AB-01 (5409 kg/ha) and S99TLYQ-A (5330 kg/ha). There was significant difference in flowering days, plant height, ear height and grain yield due to genotypes at 1-5 % level. Combined analysis over year was also carried out. Genotypes SO3TLYQ-AB-01 (4087 kg/ha), S99TLYQ-A (4072 kg/ha) and S99TLYQ-AB (3750 kg/ha) identified as promising genotypes for lower hills and river basin agro-environment of far western hills. Similarly, experiment on selection of drought tolerance maize genotypes was also carried out at this research station during 2011/12 and 2012/13. Total 105 genotypes of maize were planted for selection of drought tolerance maize genotypes during 2011/12 and it was replicated twice. Quantitative and qualitative traits were recorded for screening against drought. Out of the genotypes included in the experiment, Manakamana-4 was found super variety in terms of grain yield (4561 kg/ha), leaf senescence (1) and leaf roll (1). Statistically, plant height, ear height, flowering days and leaf senescence due to genotypes were found significantly different. Total eight genotypes were selected for second year's drought tolerance genotypes selection experiment and were planted in three replications. Out of the eight genotypes included in the experiment, Upahar (6897 kg/ha), TLBRSO7F16 (6216 kg/ha) and BLSBSO7F12 (6215 kg/ha) were found superior in terms of grain yield.Int J Appl Sci Biotechnol, Vol 3(3): 387-391

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