摘要
以‘玉露’和‘仓方早生’桃果实为试材，测定了成熟衰老过程中脂氧合酶（ＬＯＸ）活性的变化。结果表明，采后玉露桃果实在２０℃下贮藏，后熟软化进程很快，采后１～５ｄ，硬度由（１４．９３±１．００）ｋｇ／ｃｍ２降至（５．１１±０．８５）ｋｇ／ｃｍ２，随后变化平缓，表现为采后初期硬度快速下降期和后期缓慢下降期两个阶段，但仓方早生桃果实的软化类型不同于玉露；两品种果实均具有典型的乙烯跃变过程，ＬＯＸ活性峰先于乙烯释放峰出现２～３ｄ。５℃低温贮藏可显著抑制ＬＯＸ活性及乙烯的生成，有效地减缓软化；经低温贮藏１６ｄ后的玉露桃果实，置于２０℃仍能正常后熟软化，且不影响其品质。
For understanding the role of lipoxgyenase(LOX)in fruit ripening,the Chinese peach( Prunus persica L.)cultivars,‘Yulu’and‘Cangfangzaosheng’,were used to investigate the changes of LOX activity and ethylene production related to fruit softening after harvest.There were two phases of fruit softening,i.e.fast softening in earlier phase that fruit firmness decreased from(14.93±1.00)kg/cm 2 on 1st day to(5.11±0.85)kg/cm 2 on 5th day during‘Yulu’fruit ripening at 20℃,the different ripening pattern of fruit was obtained in‘Cangfangzaosheng’fruit.Ethylene production rose slightly,whereas a marked increase in LOX activity was observed in first 4-5 days,the ethylene climax was seen 2-3 days later than the appearance of maximum LOX activity in the fruits of both cultivars stored at 20℃.When‘Yulu’fruit was stored at 5℃,LOX activity and ethylene production was markedly inhibited while the fruit softening was delayed.The possible role of LOX in fruit ripening was discussed as well.
出处
《园艺学报》
CAS
CSCD
北大核心
1999年第4期227-231,共5页
Acta Horticulturae Sinica
基金
国家自然科学基金
浙江省自然科学基金
农业部"九五"重点资助
关键词
桃
脂氧合酶
乙烯
果实软化
Peach
Lipoxygenase
Ethylene
Fruit softening
