MORPHO-PHYSIOLOGICAL RESPONSES AND OsDREB2A EXPRESSION ANALYSIS OF MALAYSIAN RICE VARIETY UNDER EXTREME DROUGHT DURING EARLY STAGE OF COLEOPTILE DEVELOPMENTMORPHO-PHYSIOLOGICAL RESPONSES AND OsDREB2A EXPRESSION ANALYSIS OF MALAYSIAN RICE VARIETY UNDER EXTREME DROUGHT DURING EARLY STAGE OF COLEOPTILE DEVELOPMENT

Sherena, Audy Neysa (2025) MORPHO-PHYSIOLOGICAL RESPONSES AND OsDREB2A EXPRESSION ANALYSIS OF MALAYSIAN RICE VARIETY UNDER EXTREME DROUGHT DURING EARLY STAGE OF COLEOPTILE DEVELOPMENTMORPHO-PHYSIOLOGICAL RESPONSES AND OsDREB2A EXPRESSION ANALYSIS OF MALAYSIAN RICE VARIETY UNDER EXTREME DROUGHT DURING EARLY STAGE OF COLEOPTILE DEVELOPMENT. S1 thesis, Universitas Andalas.

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Abstract

Drought stress is a major constraint on rice production, particularly during early stage of coleoptile development. This study compared the morpho-physiological responses and OsDREB2A gene expression of two rice varieties, NMR151 and its parental line MR219, under different levels of polyethylene glycol (PEG)-induced extreme drought (0, 10, 20, 30%). Morpho-physiological observations revealed that NMR151 exhibited longer coleoptile elongation, delayed primary and secondary leaf emergence, and stronger root development compared to MR219. These traits indicate a conservative growth strategy that prioritizes seedling survival under stress conditions. PEG 20% was the most optimal concentration for maintaining seedling growth, as higher PEG levels restricted growth and development. At the molecular level, quantitative expression analysis showed similar pattern on both rice varieties and peaks at 4h after being subjected to PEG-induced extreme drought at a concentration of 30%. The integration of morpho-physiological traits with OsDREB2A expression highlights the adaptive advantage of NMR151 under water deficit. These findings provide insight into the mechanisms of drought tolerance and suggest potential markers for rice breeding programs targeting water-limited environments.

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