ABA和乙烯在草莓采后成熟衰老中的作用

随着草莓果实采后成熟衰老,ABA和乙烯生成迅速增长,乙烯累积与果实的变质腐烂程度呈正相关。ABA处理能增高纤维素酶活性和呼吸,而GA有抑制作用。ABA能促进乙烯、ACC生成,对MACC则无影响。GA_3抑制乙烯、ACC生成,促进MACC积累。CO_2对草莓有良好保鲜效果,并有效地抑制ABA和乙烯生成,低温下效果更为显著。

The Role of ABA and Ethylene in the Ripening and Senescence of Strawberry Fruits

Strawberry fruits harvested at commercial maturity were treated with GA_3, ABA, CEPA or CO_2 and the physiological and biochemical changes of fruits were determined. It was found that ABA content and ethylene production of fruits were increased during ripening and senescence (Fig 1). There was a positive correlation between ethylene accumulation in bag and decay of fruits (Fig 2). Respiration and cellulase activity of fruits were inhibited by GA_3, but promoted by ABA (Table 1, 2). GA_3 inhibited ethylene production, decreased ACG content and promoted the accumulation of MACC. ABA pxomoted ehtylene production, increased ACC content, but did not influence on MACC content (Fig 3, Table 3, 4). One of the main reason that CO_2 and low temperature delayed senescence and decreased decay of fruits was the inhibition of increase in ABA content and ethylene production (Table 5,6,7). The role of ABA and ethylene in the ripening and senescence of strawberry fruits were disscused.