氮营养与菜薹炭疽病及其相关生理指标的关系

The Relationship between Nitrogen Nutrition and Anthracnose as Well as Seve-ral Physiological Traits in Flowering Chinese Cabbage(Brassica parachinensis Bailey)

研究了 6种氮营养水平处理对菜薹炭疽病及气孔密度、叶绿素和糖含量的影响。结果表明 ,适宜的氮营养水平的植株气孔密度最小 ,病情指数最低 ,而过高、过低或不施氮营养 ,特别是高氮水平下更有利于炭疽病的发生 ,病情指数增高。炭疽病菌可破坏叶绿素的合成 ,诱导可溶性糖的大量积累 ,而适宜的氮营养水平可抑制炭疽病菌对叶绿素的破坏作用和可溶性糖的诱导效应。

The effects of six nitrogen(N)nutrition treatments on the incidence of anthracnose,stomatal density,chlorophyll content and carbohydrate content of leaves were studied in flowering Chinese cabbage.The results showed that the leaf stomatal density and disease index(DI)were the lowest in the suitable N nutrition treatment,while in the higher or lower N nutrition or non-fertilization treatments,especially in higher N treatment,the incidence of anthracnose was easier along with the DI enhanced.Anthrax fungi could destroy the synthesis of chlorophyll and induce the accumulation of the soluble carbohydrate,while suitable N treatment could inhibit the destruction to chlorophyll and the induction of the soluble carbohydrate caused by the anthracnose.