Effect of different scions/rootstocks on quality of cucumber fruits in greenhouse

Chinese. 探讨不同嫁接组合对日光温室黄瓜果实品质的影响。采用黑籽南瓜和新土佐为砧木，以津优1号、山农6号和新泰密刺为接穗，研究了嫁接和自根黄瓜果实品质的差异。嫁接黄瓜与自根黄瓜相比，果实干物质含量差异不显著，可溶性糖、Vc、游离氨基酸及黄瓜特征风味物质（2E，6Z-壬二烯醛和2，6-壬二烯醇）含量与硝酸还原酶活性均显著降低；除新泰密刺/黑籽南瓜果实Fe和Zn含量低于自根黄瓜外，硝酸盐、单宁、可滴定酸、Ca、Mg、Fe和Zn含量均明显升高。不同砧木比较，以新土佐为砧木的嫁接黄瓜营养品质较好；春秋两季栽培相比，以秋季栽培的黄瓜果实品质较好。选择合适的砧木是降低嫁接的负面影响关键的因素。

English. An experiment was conducted to investigate the effect of different scions/rootstocks on the quality of greenhouse cucumber fruits. Scions of three cucumber (Cucumis sativus L.) varieties Jinyou No.1, Shannong No.6 and Xintaimici were grafted on rootstocks of figleaf gourd (Cucurbita ficifolia) and Sintozwa (Cucurbita maxima × C. moschata) to draw comparison between cucumber and their fruits. The water contents had no obvious differentiations. The contents of soluble sugar, Vc, amino acid, particularly Glu and Asp, and the characteristic cucumber flavor ((ZE)2，6-nondienal and 2, 6-nonadienol) all decreased. The NR activity was remarkably reduced. With the exception of the increased levels of Fe and Zn in the cucumber’s own fruits, the contents of nitrate, tannin titrable acid, Ca, Mg, Fe and Zn all distinctly increased in the grafted cucumber. In terms of producing quality fruits, Sintozwa was more effective than figleaf gourd as rootstock. For cultivation periods, fall produced higher quality cucumber fruit than those of spring. The key factor in decreasing the negative impacts of grafting resides in selecting the appropriate rootstock.