Effect of drought stress on polyamine metabolism in the leaves and roots of alfalfa

Abstract

Abstract: Changes in the contents of endogenous polyamines (PAs) and the activities of metabolic enzyme in the leaves and roots of alfalfa under drought stress were studied to clarify the theoretical role of polyamine metabolism in alfalfa drought-resistance. The contents of PAs (Putrescine, Spermidine, Spermine) and the activities of ADC, ODC and PAO in the leaves and roots of alfalfa initially increased but then decreased with time. With drought stress intensification, the rising amplitude of PAs content and the activities of ADC and ODC increased. There was a significant positive correlation between Put content and the activities of ADC and ODC in the leaves and roots, suggesting that both ADC and ODC were the major pathways of Put biosynthesis in alfalfa under drought stress. Moreover, it indicated that there was a significant positive correlation not only between PA (Spd and Spm) contents and PAO activity in the leaves and roots of alfalfa but with polyamine metabolism in the leaves and roots as well. There was a close relationship between polyamine metabolism and alfalfa drought-resistance.

CLC Number:

LIU Yi, ZHANG Chun-mei, XIE Xiao-rong,YAN Fang, HU Dan. Effect of drought stress on polyamine metabolism in the leaves and roots of alfalfa[J]. Acta Prataculturae Sinica, 2012, 21(6): 102-107.

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