‘妃子笑’早花果与晚花果果实发育和糖积累动态及品质差异的比较

以同一株‘妃子笑’荔枝不同花期果实为研究对象，探讨它们在果实发育和糖组分动态及品质方面的差异．研究结果表明：早花果和晚花果的果实及其各组织的生长型均为单s型，其果实发育时期均可划分为Ⅰ期和Ⅱ期，第Ⅱ期又可划分Ⅱa期和Ⅱb期，所不同的是，早花果的Ⅰ期比晚花果要长10d．推测晚花果假种皮在Ⅱb期生长受抑的现象主要还是由于Ⅰ期和Ⅱa期的果皮和种皮生长受到抑制的结果．早花果的糖分积累主要发生在Ⅱa期，晚花果的糖分积累则主要发生在Ⅱb期，它们均是以积累还原糖为主，成熟时两者在总糖及其各组分之间并无显著差别．早花果比晚花果品质好主要表现在果大、含酸量低、固酸比高等方面．

Comparison of fruit development and sugar accumulation dynamics and fruit quality between fruits from early and late bloom‘Feizixiao’litchi

Fruit development,sugar accumulation dynamics and fruit quality were comparatively studied between fruit from early and late blooms on the same panicle in litchi cv.'Feizixiao'.The results showed that no differences in the growth patterns of whole fruit and fruit parts(single S pattern) were revealed between fruit from female bloom at different dates.Their fruit growth could be divided into two stages(stage I and stage II),and stage II could be divided into two substages(IIa and IIb).However,fruit from earlier bloom showed 10 d longer in stage I than that from late bloom.It was presumed that the significant lower growth rate of the whole fruit and aril from late bloom during stage IIb were related to their obviously lower growth rate of the pericarp and seedcoat during stage I and stage IIa compared with the fruit from early bloom.In both case,fruit accumulated more reducing sugars than sucrose and the main sugar accumulating period was in stage IIa for fruit from early bloom and in stage IIb for the fruit from late bloom.There was no significant difference in sugars content between fruits from early and late bloom.The better quality of fruit from early bloom than that from late bloom was because the former had bigger fruit mass,lower total acid(TA) and higher TSS/TA ratio.