摘要:
为了明确诱导枇杷单性结实形成无核果实的机理和适宜诱导时机,通过观测不同时期400mgL-1 GA3+20mgL-1 CPPU诱导后的早钟六号枇杷花器官和果实种子生长发育情况。结果表明,花蕾期处理果实无核率为100.0%,花后处理和对照为0,花后处理的种子重、幼果种子数、成熟果种子数及种子萌发率与对照均无显著差异,显然,GA3+CPPU诱导枇杷的花蕾能加剧雌雄异熟和雌雄异位,导致授粉受精机会大幅减少或避免,没有形成种胚是导致枇杷单性结实的主要原因,受精前的花蕾期是获得枇杷无核果实的适宜诱导时机。
Abstract:
The flower organs and fruit seed of loquat,Zhao Zhong No.6,were studied for their growth and development with the induction of 400 mgL-1 GA3 and 20 mgL-1 CPPU at different growth stages.The study was aimed to understand the mechanism involving the parthenocarpic development,as well as to determine the appropriate time for the induction.The results showed that 100.0% seedless rate was achieved when the induction took place in the flower budding stage,while 0% if the induction was done after anthesis or on the control plant.No significant differences on pit weight,number of pits in young and mature fruit or seed germination rate were found on plants induced after anthesis and the control.It appeared that GA3+CPPU induction on the flower bud enhanced the dichogamy and herkogamy resulting in significant reduction,or total absence,of pollination and fertilization.Without formation of embryo,the loquat fruit would not form pit.Therefore,the time for GA3+CPPU induction in order to produce seedless loquat fruits would be during its budding stage before pollen fertilization.
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