Effects of Gibberellic Acid on Rice Physiology under Different Nitrogen Form Nutrition and Water Stress Condition

doi:10.3969/j.issn.1000-7091.2012.06.035

Abstract

Abstract: using the method of nutrient solution culture and simulated water stress with PEG6000， the combination effects of nitrogen forms，water stress and exogenous gibberellic acid( GA3 ) on physiological attributes and growth of rice( Oryza sativaL． cv．， Jinyou 402) were studied． The trials had 15 treatments of three water conditions ( non-water stress，water stress，water stress and GA3 ) and five nitrogen nutrients conditions ( NH⁺₄-N/NO^-₃N of0 /100，25 /75， 50 /50，75 /25，100 /0). The results obtained were as follows: Water stress reduced the leaf area， leaf relative water content ( RWC),chlorophyll concentration，but it increase proline accumulation in rice plant． GA3 largely enhanced the above physiological parameters to levels similar to control． Exogenous application of GA3 improved the water stress tolerance in rice plant by maintaining membrane permeability，enhancing chlorophyll concentration， leaf relative water content( RWC) and leaf area． Mixture of 25%NH⁺₄-N and 75%NO-3-N was the best nitrogen nutrition condition for rice plant to relieve the water stress under water stress condition，but it was the nitrogen nutrition condition of 50%NH⁺₄-N and 50%NO-3-N in mixture of water stress and GA3 condition．

Key words: Ammonium, Nitrate, Water stress, Gibberellic acid( GA3 )

CLC Number:

S143.1

GAO Zhi-hong, CHEN Xiao-yuan, XIE Hong-juan. Effects of Gibberellic Acid on Rice Physiology under Different Nitrogen Form Nutrition and Water Stress Condition[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2012, 27(6): 178-184. doi: 10.3969/j.issn.1000-7091.2012.06.035.

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