氮钾营养对烟叶衰老过程中内源激素与叶绿素含量的影响.pdfVIP

2005, 11(3) : 379- 384 Plant Nutrition and Fert ilizer Science 赵 平, 林克惠, 郑毅 ( , 650201) : , , , (CTK) , ( ABA) , , CTK , ABA , , CT K CTK/ ABA , ABA , , , , , , , : ; ; ; ; ; : S57206 : A : 1008-505X(2005) 03- 0379- 06 Effect of N and K nutrition on chlorophyll content and endogenous hormones in the process of tobacco senescence ZHAO Ping, IN Kehui, ZHENG Yi (Dep artment of Plant Nutrition, Yunnan Agricultural University , K unming 650201, hina) Abstract: N and K play key roles in the quality and senescence of tobacco leaves. Pot culture and field experiments were conducted in Xundian County and Kunming City of Yunnan Province to study the ripe mechanism of tobacco leavesregu latedby N and K nutrition from the changes of endogenous hormones and chlorophyll content in the leaves. Results showed that the content of N, K, chlorophyll, endogenous CTK decreased in the process of leave senescence, while the content of endogenousABA took on a liner upward tendency. Multiplying application of N and K fertilizers could effec tively improve N and K trophic level, increase chlorophyll and CTK content and reduce ABA content of tobacco leaves, thusretard the senescence of tobacco leaves. There was a significant positive correlation between N, K content and chlorophyll, CTK content and CTK/ABA value, however, the correlation between N, K content and ABA content in tobacco leaves was significant negative. Thus, the content of endogenous hormones and its balance in tobacco leaf were close related to N and K nutrition. Altering the dosage of N and K fertilizers could regulate senescence rate of tobacco. It was also shown that no matter single increasing the dosage of K fertilizer or increasing the K dosage coordinated