[Effects of Colletotrichum higginsianum infection on endogenous hormones in Brassica parachinensis leaves under different nitrogen nutrition].
This paper studied the effects of Colletotrichum higginsianum infection on the ethylene production and the contents of abscisic acid (ABA) and indole-3-acetic acid (IAA) in leaves of flowering Chinese cabbage (Brassica parachinensis) under six levels of nitrogen (N) nutrition, and their relations to disease-resistance. The results showed that the ethylene production in all N treatments had a mono-peak curve change, and reached the maximum 4-6 days after inoculation. In comparing with high N or non-N treatment, medium or low N treatment could inhibit ethylene production and ABA synthesis, and keep ethylene and ABA stable in Colletotrichum higginsianum-inoculated plants. The IAA content in medium or low N treatment increased gradually, while that in high N or non-N treatment had a mono-peak curve change, and reached the maximum 4-6 days after inoculation. The IAA content in medium or low N treatment increased more with inoculation time, indicating that there was a close relationship among N nutrition, endogenous hormones and anthracnose. It is important for plants' disease-resistance to keep the balance of endogenous hormones.
Yang
Xian
X
College of Horticulture, South China Agricultural University, Guangzhou 510642, China. yx16@163.net
Chen
Xiaoyan
X
D001937:Brassica / Q000378:metabolism* / Q000382:microbiology*; D020231:Colletotrichum / Q000502:physiology*; D009584:Nitrogen / Q000032:analysis*; D010935:Plant Diseases / Q000382:microbiology; D010937:Plant Growth Regulators / Q000032:analysis*; D018515:Plant Leaves / Q000378:metabolism
D010937:Plant Growth Regulators; D009584:Nitrogen