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苹果授粉受精后,与未授粉子房相比,坐果率高,幼果干物质迅速积累。授粉处理可使前期内源乙烯生成量急剧上升,第4天达最高值;在授粉后第8天出现一玉米素核苷(ZRs)含量高峰,此时 ZRs 含量为处理前的66倍;授粉处理的幼果内,异戊烯基腺嘌呤(iPA)及脱落酸(ABA)含量均呈逐渐上升的变化趋势。未授粉处理的苹果子房,ZRs 含量一直较低,其 ABA 含量分别在处理的第2天和第12天较高,子房最终全部脱落。测定期间,授粉处理的幼果 ABA/(ZRs+iPA)比值逐渐下降,说明细胞分裂素类在幼果生长前期逐渐增加,促进了幼果的坐果与生长;而未授粉的子房分别在取样的第2天和第12天出现高 ABA/(ZRs+iPA))比值,可见,未授粉子房内的高ABA 含量可能与苹果第一次生理落果密切相关。
After pollination and fertilization, compared with the non-pollination ovary, the fruit set rate is high, and the dry matter of young fruit is rapidly accumulated. Pollination treatment could increase the amount of endogenous ethylene production in the early stage and reach the highest value on the 4th day. The peak of ZRs appeared on the 8th day after pollination, at this time, the content of ZRs was 66 times before treatment; pollination The contents of isopentenyladenine (iPA) and abscisic acid (ABA) showed a gradual upward trend in the young fruits treated. The non-pollination of apple ovary, ZRs content has been low, the ABA content in the treatment of the first two days and the twelfth day higher ovaries eventually all fall off. During the measurement period, the ratio of ABA / (ZRs + iPA) in fruitlets decreased gradually, indicating that cytokinins increased gradually during the early growth of young fruit and promoted the fruit setting and growth of young fruit. However, (ABR / (ZRs + iPA)) on day 2 and day 12, we found that the high ABA content in non-pollination ovary may be closely related to the first physiological drop of apple.