Orchestration of transpiration, growth and carbohydrate dynamics in rice during a dry-down cycle

Functional Plant Biology : FPB
Delphine LuquetMichael Dingkuhn

Abstract

The regulation of carbohydrate metabolism and source-sink relationships among organs play a key role in plant adaptation to drought. This study aimed at characterising the dynamics of transpiration, development, growth and carbon metabolism, as well as the expression of invertase genes, in response to drought during a dry-down cycle. Three 1-month experiments were conducted in controlled environment using the rice genotype IR64 (Oryza sativa L., indica). Plant leaf relative transpiration and expansion rates decreased linearly when fraction of transpirable soil water (FTSW) dropped below 0.66 and 0.58, respectively. Hexose and starch concentration responses to FTSW in a given organ were generally linear and opposite: in source leaves, hexose concentration increased and starch decreased, and vice versa in sink leaves and roots. Sucrose remained constant in source leaves and increased slightly in sink leaves. Starch reserves built up during stress in sink organs were rapidly mobilised upon rewatering, indicating its involvement in a mechanism to ensure recovery. Expression of cell-wall and vacuolar invertase genes under stress increased in sink leaves, interpreted as a mechanism to maintain sink activity (cell wall) and osmotic ad...Continue Reading

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Citations

Jul 1, 2013·Functional Plant Biology : FPB·Maria Camila RebolledoMichael Dingkuhn
May 11, 2010·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Romain PhilippeDominique This
Aug 29, 2012·The New Phytologist·Florent PantinBertrand Muller
Jan 4, 2021·Plant Cell Reports·Showkat Ahmad Ganie, Golam Jalal Ahammed
Apr 25, 2018·Journal of Agricultural and Food Chemistry·F El HageM Reymond

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