Effect of water regime on growth yield and hormonal changes in MR 220 rice variety during reproductive stage

Shahida Hashim, . and Chan Chee Sheng, . Effect of water regime on growth yield and hormonal changes in MR 220 rice variety during reproductive stage. pp. 99-106. ISSN 1394-9829

This study was conducted in a plant house at MARDI Seberang Perai. The objectives of this study were to determine endogenous plant hormones that are involved in the regulation of spikelet sterility particularly when exposed to different water regimes during reproductive stage (the most sensitive period to water stress) and to determine the effect of exogenous hormone/hormones to the spikelet sterility. In this study MR 220 was used and subjected to different water regimes namely flooded saturated and aerobic soil conditions. Number of productive tiller tiller mortality grain yield percentage of filled grain and harvest index were significantly influenced by the water regimes tested. Abscisic acid (ABA) level was significantly higher when plants were grown under aerobic soil condition and its level remained slightly constant in the spikelets of plants grown under flooded and saturated soil conditions. However no significant effects were shown by water regimes on levels of indole-3-acetic (IAA) and gibberellic acid (GA3). Application of exogenous ABA to the plant increased the percentage of filled grain particularly when plants were grown under aerobic soil condition while application of ABA inhibitor fluridone significantly reduced the percentage of filled grain for all water regimes tested.

Full text available from: Official URL: http://jtafs.mardi.gov.my/jtafs/46-2/regime.pdf

Abstract

This study was conducted in a plant house at MARDI Seberang Perai. The objectives of this study were to determine endogenous plant hormones that are involved in the regulation of spikelet sterility particularly when exposed to different water regimes during reproductive stage (the most sensitive period to water stress) and to determine the effect of exogenous hormone/hormones to the spikelet sterility. In this study MR 220 was used and subjected to different water regimes namely flooded saturated and aerobic soil conditions. Number of productive tiller tiller mortality grain yield percentage of filled grain and harvest index were significantly influenced by the water regimes tested. Abscisic acid (ABA) level was significantly higher when plants were grown under aerobic soil condition and its level remained slightly constant in the spikelets of plants grown under flooded and saturated soil conditions. However no significant effects were shown by water regimes on levels of indole-3-acetic (IAA) and gibberellic acid (GA3). Application of exogenous ABA to the plant increased the percentage of filled grain particularly when plants were grown under aerobic soil condition while application of ABA inhibitor fluridone significantly reduced the percentage of filled grain for all water regimes tested.

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Item Type:	Article
AGROVOC Term:	Rice
AGROVOC Term:	Varieties
AGROVOC Term:	Yields
AGROVOC Term:	Growth
AGROVOC Term:	Hormones
AGROVOC Term:	Sandy soils
AGROVOC Term:	Maturity
AGROVOC Term:	Panicles
AGROVOC Term:	Spikelets
AGROVOC Term:	Moisture content
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	30 Apr 2025 01:16
URI:	http://webagris.upm.edu.my/id/eprint/24371

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