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A Study on Cadmium Adaptation Diversity in Vegetables and Corresponded Mechanisms

Author: YangJiHui
Tutor: LiXiaoFeng
School: Guangxi University
Course: Plant Nutrition
Keywords: Vegetables Cadmium Duress Suitability Mechanism
CLC: S63
Type: Master's thesis
Year: 2007
Downloads: 68
Quote: 1
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Abstract

In this paper, different varieties of flowering cabbage (31 Shek Pai forty-nine) and spinach, cabbage test materials, test methods hydroponic plant growth, plants from cadmium (Cd), Absorption and Accumulation of Cd, Cd distribution, as well as plants and cell membrane stability, explore the adaptability and variety of vegetables to Cd stress differences between mechanisms designed for the rational distribution of vegetable production of Cd resistant vegetable varieties bred to provide scientific theoretical basis . The results show: The seedling age 30d of vegetables after Cd (1,3,6 μg · mL ^{-1 ) treatment 5d, the tested vegetables Cd content in the body and the cumulative amount of leaf relative conductivity, MDA levels were significantly increased, while several biological yield of vegetables and spinach, cabbage leaf chlorophyll content was significantly reduced, Cd stress to reduce membrane structure stability, inhibit the growth of vegetables. There are significant differences between Cd stress reaction in spinach and cabbage, as well as several varieties of flowering cabbage. 3 varieties of flowering cabbage relative biological production by the Cd stress affect the size of the order: the 31st Shek Pai> forty-nine. 6μg · mL ^{-1 of Cd leaf relative conductivity, MDA content in order: No. 31 Shek Pai> forty-nine. 1,3 μg · mL ^{to the -1 cabbage biological production of Cd than spinach affected by the degree of inhibition, and · mL, 3μg, ^{-1 Cd treatment 5d leaf relative conductivity, MDA content in Chinese cabbage> spinach and spinach chlorophyll content greater than the content of the cabbage. These results suggest that the stress of Cd forty-nine flowering cabbage a strong adaptability varieties, spinach Cd stress adaptability cabbage. Several vegetables in vivo Cd content and cumulative amount of Cd increased with increasing Cd concentration. The size of the cumulative amount of the order are different varieties of vegetables heart of Cd: forty-nine Shek Pai> 31 Cd adaptable vegetables - spinach Cd content of the body and the cumulative amount is less than the cabbage. These results suggest that forty-nine Chinese cabbage Cd strong adaptability due to its absorption of Cd the strong endurance capacity, while one of the mechanism of strong adaptability of Cd in the spinach in its absorption of Cd resist. Cd treatment, the test order of vegetable organs Cd content are: roots> stems> leaves. The distribution of Cd in the tested vegetable organs as well as cellular components differ. Adaptability forty-nine flowering cabbage reduce root cells in Cd, Cd distribution increase the vacuole and conducting tissue stem cells, and the ability to avoid the increase of the soluble fraction of Cd and organelles in leaf cells and adapt 31 varieties of sensitive contrast. With Cd stress intensity strengthening, Cd in adapt Cd stress ability spinach stems, the distribution ratio in the various components of the leaf cells does not increase the adaptability weak the cabbage but significant increase in the proportion of Cd in the soluble fraction. These results indicate that, under Cd stress reduction distribution of Cd in the soluble fraction of the leaf cells and organelles is another important mechanism forty-nine flowering cabbage adapt Cd stress, while Cd the stable distribution capacity in the different organs and cellular components spinach another mechanism to adapt Cd stress. 1,3,6 μg · mL ^{-1 Cd treatment, the relative increase in the relative activity of SOD and POD 3 varieties of flowering cabbage leaves. The blades POD, CAT relative activity size the order: forty-nine> Shek Pai> 31. POD and CAT of spinach leaves after Cd treatment relative activity increase in the cabbage leaves CAT activity relative decline, and the spinach leaves relative activity of POD and CAT were higher than cabbage. These results show that, the Cd stress relatively efficient membrane lipid antioxidant system is forty-nine flowering cabbage and spinach resistance ability Cd stress the one of the reasons.}}}}}

A Study on Cadmium Adaptation Diversity in Vegetables and Corresponded Mechanisms

Abstract

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