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Narrow lpa1 Metaxylems Enhance Drought Tolerance and Optimize Water Use for Grain Filling in Dwarf Rice
   

Narrow lpa1 Metaxylems Enhance Drought Tolerance and Optimize Water Use for Grain Filling in Dwarf Rice

Ryza A. Priatama, Jung Heo, Sung Hoon Kim, Sujeevan Rajendran, Seoa Yoon, Dong-Hoon Jeong, Young-Kug Choo, Jong Hyang Bae, Chul Min Kim, Yeon Hee Lee, …
Frontiers in plant science, Vol.13, pp.894545-894545
05/10/2022
: https://doi.org/10.3389/fpls.2022.894545
: 35620680
Plant Science Rice—Genetics Rice—Drought tolerance Plants—Water efficiency—Genetic aspects Xylem—Development Plant architecture
Rice cultivation needs extensive amounts of water. Moreover, increased frequency of droughts and water scarcity has become a global concern for rice cultivation. Hence, optimization of water use is crucial for sustainable agriculture. Here, we characterized Loose Plant Architecture 1 ( LPA1 ) in vasculature development, water transport, drought resistance, and grain yield. We performed genetic combination of lpa1 with semi-dwarf mutant to offer the optimum rice architecture for more efficient water use. LPA1 expressed in pre-vascular cells of leaf primordia regulates genes associated with carbohydrate metabolism and cell enlargement. Thus, it plays a role in metaxylem enlargement of the aerial organs. Narrow metaxylem of lpa1 exhibit leaves curling on sunny day and convey drought tolerance but reduce grain yield in mature plants. However, the genetic combination of lpa1 with semi-dwarf mutant ( dep1-ko or d2 ) offer optimal water supply and drought resistance without impacting grain-filling rates. Our results show that water use, and transports can be genetically controlled by optimizing metaxylem vessel size and plant height, which may be utilized for enhancing drought tolerance and offers the potential solution to face the more frequent harsh climate condition in the future.

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url
https://doi.org/10.3389/fpls.2022.894545
Published (Version of record)
1
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