Effects of 1-MCP on chlorophyll degradation pathway-associated genes expression and chloroplast ultrastructure during the peel yellowing of Chinese pear fruits in storage

文献类型： 外文期刊

第一作者： Cheng, Yudou

作者： Cheng, Yudou;Dong, Yu;Yan, Hongbo;Ge, Wenya;Guan, Junfeng;Liu, Liqin;Zhang, Yingying;Cheng, Yudou;Guan, Junfeng;Dong, Yu;Shen, Chengguo

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关键词： pear;1-MCP;chlorophyll degradation;chloroplast

期刊名称：FOOD CHEMISTRY （ 影响因子：7.514； 五年影响因子：7.516 ）

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收录情况： SCI

摘要： The peel yellowing is an important pigment physiological process of green fruit ripening, which mainly results from chlorophyll degradation in the fruit peel. In this work, two typical cultivars with different ripening speed, a slow ripening pear 'Emerald' [Pyrus bretschneideri Rend. cv. Emerald) and a fast ripening 'Jingbai' (Pyrus ussuriensis Maxim, cv. Jingbai) were used to investigate the molecular mechanism of chlorophyll degradation in pear yellowing/ripening during postharvest storage. The fruits after harvest were treated with 1-methylcyclopropene (1-MCP), an ethylene action inhibitor at 1.0 μLT~(-1) to determine its effect on chloroplast ultrastructure and the expression of chlorophyll degradation associated genes in peel tissues. Our results show that the pears treated with 1-MCP had a lower ethylene production rate and higher chlorophyll content compared to those of untreated fruit. The more intact chloroplasts with well-organised grana thylakoids and small plastoglobuli were maintained in the peel of 1 -MCP treated fruit for up to 30 and 15 d in 'Emerald' and 'Jingbai', respectively. The expression of chlorophyll degradation associated genes: pheophorbide a oxygenase (RAO), non-yellow colouring (NYC), NYCl-like (NOZ.), stay-green 1(SGR1), was suppressed, while no significant change was found in chlorophyllase 1 (CHL1) and red chlorophyll catabolite reductase [RCCR] in both cultivar fruits treated with 1-MCP. These results suggest that 1 -MCP can delay chlorophyll degradation by inhibiting ethylene production and suppressing the gene expression of PAO, NYC, NOL and SCR1, which are closely associated with chlorophyll catabolic pathway.

分类号： TS2

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