Working Paper Review Version 2 This version is not peer-reviewed

Recent Advances in the Drought Stress Tolerance in Rice

Version 1 : Received: 8 October 2019 / Approved: 9 October 2019 / Online: 9 October 2019 (10:36:28 CEST)
Version 2 : Received: 23 December 2019 / Approved: 23 December 2019 / Online: 23 December 2019 (11:56:03 CET)
Version 3 : Received: 24 December 2019 / Approved: 24 December 2019 / Online: 24 December 2019 (11:39:50 CET)

How to cite: Kumar, M. Recent Advances in the Drought Stress Tolerance in Rice. Preprints 2019, 2019100099 Kumar, M. Recent Advances in the Drought Stress Tolerance in Rice. Preprints 2019, 2019100099

Abstract

Many studies were done in the development of drought stress-tolerant transgenic plants, including crop plants. Rice is considered to be a vital crop target for improving drought stress tolerance. Much transgenic rice showed improved drought stress tolerance was reported to date. They are genetically engineered plants that are developed by using genes that encode proteins involved in drought stress regulatory networks. These proteins include protein kinases, transcription factors, enzymes related to osmoprotectant or plant hormone synthesis, receptor-like kinase. Of the drought stress-tolerant transgenic rice plants described in this review, most of them display retarded plant growth. In crop crops, plant health is a fundamental agronomic trait that can directly affect yield. By understanding the regulatory mechanisms of retarded plant growth under drought stress, conditions are necessary precursors to developing genetically modified plants that result in high yields.

Supplementary and Associated Material

Subject Areas

drought stress; osmotic stress; rice; transcription factors; stress signaling; qtl; breeding

Comments (1)

Comment 1
Received: 23 December 2019
Commenter: Manu Kumar
Commenter's Conflict of Interests: Author
Comment: 5. Other Aspects of ABA Signaling
ABA transporters are also a significant part of ABA signaling, as it is important to transport
ABA from its sites of synthesis to its multiple sites of action within plants. In Arabidopsis, four ABA
transporters have been identified (AtABCG25, AtABCG30, AtABCG31, and AtABCG40) all of which
are ATP-binding cassette transporter G subfamily members [199–202]. AtABCG25 is involved in
exporting ABA from the vasculature [201], while AtABCG40 is a plasma-membrane ABA-uptake
transporter in guard cells, and is necessary for timely closure of stomata in response to drought stress
and seed germination [199,200]. AtABCG30 mediates ABA uptake into the embryo, while AtABCG31
brings about ABA secretion from the endosperm [200]. A recent study reported ABA transporter-like
1 (AhATL1) gene from peanut (Arachis hypogaea L.) whose cognate protein, AhATL1, is a member
of the ATP-binding cassette transporter G subfamily and localizes to the plasma membrane [203].
The expression of both the AhATL1 transcript and the corresponding protein was upregulated by
water stress and treatment with exogenous ABA. Another report suggested that in Medicago truncatula,
MtABCG20 acts as an ABA exporter that influences root morphology and seed germination [204].
These data indicate that the ABA transport system plays a significant role in water deficit tolerance
and growth regulation [203].
ABA signaling crosstalk occurs with other hormones that are involved in plant growth and stress
response. These hormones include strigolactone, cytokinin, and karrikin. Strigolactone (SL) is a recently
discovered class of phytohormone that inhibits shoot branching [205]. ABA signaling may regulate SL
biosynthesis [206]. The antagonistic action of ABA and cytokinin signaling mediates drought stress
response in Arabidopsis [207]. Karrikin signaling pathway seems to be upstream of ABA signaling
pathway and karrikin mediates changes in ABA-related gene expression [208]. DELLA protein is
important for seed germination [209]. ABA also interacts with DELLA protein when DELLA/ABI3/ABI5
complex is involved in seed germination [210].
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