水分胁迫对干旱锻炼后木薯叶片内脱落酸、脯氨酸及可溶性糖含量的影响

Research on Content Changes of Abscisic Acid,Proline and Soluble Sugar in Cassava Leaves after Drought Hardening

以抗旱能力有显著差异的木薯品种SC124和ARG7为实验材料,研究经前期干旱锻炼后再次水分胁迫对木薯叶片内脱落酸、脯氨酸及可溶性糖含量的影响。结果表明,干旱锻炼能显著提高木薯叶片内ABA的积累速率与积累量,不同品种在干旱4 d内均达到最大积累量,且抗旱性越强积累量越大;水分胁迫下,经干旱锻炼的木薯叶片中脯氨酸含量高于对照,最大积累的维持时间较长;随着干旱时间的延长,木薯叶片中葡萄糖和果糖逐渐积累,干旱后期略有下降,蔗糖在干旱初期大量积累,后急剧下降并维持在较低水平,前期的干旱锻炼可以提高不同干旱时期木薯叶片中可溶性糖的积累量。本研究为深入研究木薯的抗逆性和人为提高木薯抗旱性能提供理论基础。

Two varieties of cassava, SC124 and ARG7, were treated as experimental materials because of significantly different drought resist- ance. Effects of drought hardening on the content changes of abscisic acid, proline and soluble sugar in cassava leaves were clarified in this research. The results showed that drought hardening could significantly increase the accumulation of ABA and its rate, different species could reach the maximum accumulation of ABA in four days, and the stronger drought resistance the greater accumulation rate of ABA; under water stress, the content of proline in cassava leaves was higher than that of the control, and the maximum accumulation of preline maintained a longer time; glucose and fructose in cassava leaves gradually accumulated with the extension of drought time and then decreased slightly at the end of drought stress; sucrose in cassava leaves accumulated in the early days of drought stress, and maintained at a low level after a sharp decline; drought hardening can increase the accumulation of soluble sugar in cassava leaves at different time of drought stress. The study provided a theoretical basis for the further research and artificially increasing cassava drought resistance.