火棘果实成熟与贮藏中代谢生理及植物生长调节剂的作用

Metabolism and action of plant growth regulators during ripening and storage of firethorn fruit.

研究了火棘果实发育成熟和贮藏过程中呼吸作用、相关氧化酶、营养成分的动态变化以及植物生长调节剂赤霉素(GA_3)和6-苄基腺嘌呤(6-BA)的作用,果实采收前2个月用80mg/kgGA_3喷施,刺激其呼吸强度升高,过氧化氢酶活性增强,可溶性糖、游离氨基酸含量提高及果胶、总酸度等下降。采用2个月用50mg/kg 6-BA喷施,则火棘果实呼吸强度下降,多酚氧化酶活性增强,能显著提高其在常温下的耐藏性。若采后用GA_3处理,刺激贮藏前期呼吸强度和多酚氧化酶活性增强。用6-BA处理,对整个贮藏期呼吸强度均有一定刺激作用,可保留较多的可溶性糖和维生素C。

The firethorn( Pyracantha Roem) fruits were sprayed with 80mg/L gibberellic acids(GA3) and 50mg/kg 6-benzyladenine (6-BA) two months before harvest or after harvest. The changes of respiratory rate,peroxidase,catalase, polyphenol oxidase,ascorbic acid oxidase and their nutritional components were investigated. The results showed that GA3 treatment before harvest induced the increase of respiratory rate and catalase activity,and the soluble sugar,free amino acids significantly increased while the pectin and total acids significantly decreased. If 6-BA was sprayed, the respiratory rate decreased,polyphenol oxidase activity increased,the content of soluble sugar fell but the storage life was prolonged without any significant effect on quality of the fruit. When GA, and 6-BA were used to treat the fruits after harvest,the treatment of 6-BA slightly increased the respiratory rate and kept much more soluble sugar and vitamin C than the control one. Both GA3 and 6-BA treatments had not significant effect on the storage life.