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Auxin protects spikelet fertility and grain yield under drought and heat stresses in rice.

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Title Auxin protects spikelet fertility and grain yield under drought and heat stresses in rice.
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Creator Sharma L, Dalal M, Verma RK. VVK Santosh, Yadav SK, Pushkar S, Kushwaha S R, Bhowmik A & Chinnusamy V
Subject AUXIN RESPONSE FACTORS Auxin signalling Chlorophyll Endogenous auxin Indole-3-acetic acid Pollen viability ROS TRANSPORT INHIBITOR RESPONSE1 YUCCA
Description Not Available
Rice is highly sensitive to drought and high temperature (HT) stresses at reproductive phase. Since auxin is a
major regulator of reproductive development, we analysed the role of indole-3-acetic acid (IAA) in spikelet
fertility of rice under drought and HT stresses in 4 different experiments with 23 diverse rice genotypes. The
results showed that both of these stresses reduced the pollen viability, spikelet fertility, and yield components.
Exogenous IAA (10−5 M) sprayed on plants during drought or heat stresses mitigated the adverse stress effects
on pollen viability, spikelet fertility and yield components across experiments in most genotypes. Exogenous IAA
application reduced the membrane lipid peroxidation and ROS accumulation in spikelets under both stresses.
Drought and HT stresses significantly reduced the mean endogenous IAA content of rice panicles. Endogenous
IAA levels significantly and positively correlated with pollen viability and yield component traits, and negatively
correlated with lipid peroxidation of spikelets. Expression of most of the YUCCA genes and their transcriptional
regulators SPL, NGA and TFL were downregulated in the spikelets of rice genotypes under stress. Further, auxin
co-receptor genes TIR1/AFB2-AUX/IAA, ARF target gene HAF TF, 3 out of 4 PIN genes, and 5 ARFs analysed in
this study were significantly downregulated by drought/heat stresses in rice spikelets. These results showed that
drought and HT stress-mediated decline in endogenous IAA level and impairment of IAA signalling are the major
causes of spikelet sterility in rice. Exogenous auxin and genetic manipulation of auxin synthesis and signalling
will be useful to mitigate spikelet sterility and stabilize the grain yield of rice under drought and heat stresses.
Not Available
Date 2018-07-13T11:49:33Z
Type Research Paper
Identifier Not Available
Not Available
Language English
Relation Not Available;
Publisher Elsevier