The Effect Of High Zn Stress On Yield And Quality Of Different Chinese Cabbage Cultivars

Zinc is not only an essential element for plant growth, but also is a poisonous heavy metal element. In recent years, Zinc lacking was found in crops in many areas, and affected the health of children through food chains in local area; on the other hand, because of fertilizing, sludge irrigating, pesticide spraying, domestic garbage and industry "three wastes" letting which has different degrees pollution in heavy metals Zn, Cd, and Cu, these heavy metals had made yield and quality of vegetable detracted. Chinese cabbage is noticeable vegetable of our country, which was the main vegetable in winter and spring; its quality concerns the health of people. Crops growing under high levels of heavy metal Zn tend to develop biochemical and molecular mechanisms to tolerate the toxicity of heavy metal Zn stress. But apparently differences of adaptability and resistance were found among different species and different cultivars of crops. The solution cultivation experiment of 6 Chinese cabbage cultivars and the pot experiment (root bag method) of 4 Chinese cabbage cultivars were carried out to investigate the influence of high Zn stress on the Chinese cabbage growth; the influence of biomarkers; the absorption of nutrion; the influence of available N, P, K and Zn contents in rhizosphere or nonrhizosphere; the diversity of resistance and the influence in Zn accumulation of Chinese cabbage. The aim of the experiment was to provide theoretics bases for selecting high resistance, high enrichment Chinese cabbage. The main results are as follows:1. Different cultivars of Chinese cabbage showed different response to high Zn stress. Insolution experiment, the plant growth of Chinese cabbage was markedly decreased under Zn stress (The maximum decreasing rates of plant in shoots was at 38.33%~75.91%, in roots was at...