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以5年生‘天红2号’苹果/SH40/八棱海棠为试材,对其上部、中部和下部新梢叶片进行13C标记处理,研究其产生的13C同化物的运输分配去向。结果表明:新梢的13C自留量(自身叶片+自身新梢)以上部新梢中最高,为91.00%,中部新梢中次之,为79.34%,下部新梢中最小,为67.39%;新梢向其它器官提供13C同化物能力大小的顺序为:下部新梢>中部新梢>上部新梢;其中向根系的13C分配率差异最为显著,由大到小依次为下部新梢>中部新梢>上部新梢;上部和中部新梢输出的13C同化物均有超过50%分配到地上部,分别为87.42%和59.79%,而仅有12.58%和40.21%分配到地下部,表现为以向地上部运输为主,而下部新梢分配到根系的13C同化物达到了75.53%,以向根系运输为主。
Five-year-old ’Tianhong No.2’ apple / SH40 / Palus ciliatis was used as test material to study 13C labeling of the upper, middle and lower shoots, and to study the distribution of the 13C assimilates. The results showed that the 13C self - retention (self - shoots + self - shoots) of new shoots was highest at 91.00% in the upper shoots, 79.34% in the middle shoots and 67.39% in the lower shoots. The order of 13C assimilate ability of shoots to other organs was as follows: the lower shoots> the middle shoots> the upper shoots; among them, the 13C distribution ratio to the root system was the most significant, and the order of the lower shoots was the lower shoots> middle fresh shoots Shoots> upper shoots; more than 50% of the 13C assimilates output from shoots of the upper and middle shoots were distributed to the aerial parts, 87.42% and 59.79% respectively, while only 12.58% and 40.21% were assigned to the lower part of the shoots, Mainly to the aboveground transport, while the allocation of 13C assimilates of the lower shoots to the root reached 75.53%, mainly to root transport.