高温胁迫下番茄体内ABA水平的变化及其对花粉萌发的影响

 研究了番茄耐热品种和不耐热品种在高温条件下内源ABA水平的差异, 探讨了外源ABA处理对高温下花粉萌发的影响。结果表明, 在常温下, 耐热与不耐热品种叶片中ABA差异不明显, 但在高温下, 耐热品种叶片ABA含量提高的幅度明显大于不耐热品种; 耐热品种花器官中ABA含量无论在常温还是在高温下, 都高于不耐热品种; 外源ABA处理可以显著减轻高温对花粉萌发的抑制作用。

Changes of Endogenous Abscisic Acid and the Effent of Exogenous ABA on Pollen Germination under Heat Stress Tomato

The investigation was done on the comparision with endogenous abscisic acid levels, and the effect of exogenous abscisic acid on the pollen germination under high temperature among different heat-tolerant tomato varieties. It showed that the leaf ABA levels had no obvious difference between heat-tolerant and heat-sensitive varieties at op timal growing temperature (25℃) , but increased greatly in heat-tolerant varieties after treatmentwith superop timal temperatures. Heat-tolerant varieties exhibited a higherABA level in flowers both at op timal and superop timal temperatures compared with heat-sensitive varieties. Application of exogenous ABA could partly alleviated inhibition of heat stress on pollen germination.