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| Effects of Aluminum Stress on Growth and Physiological Characteristics of Watermelon Seedlings |
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| KeyWord:aluminum stress; watermelon; seedling growth; physiological characteristics |
| Author Name | Affiliation | | JIA Song-tao | College of Horticulture, Sichuan Agricultural University,Ya′an 625014,China | | ZHENG Yang-xia | College of Horticulture, Sichuan Agricultural University,Ya′an 625014,China | | QIU Shuang | College of Horticulture, Sichuan Agricultural University,Ya′an 625014,China | | ZHANG Wei-wei | College of Horticulture, Sichuan Agricultural University,Ya′an 625014,China |
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| Abstract: |
| Aluminum（Al） phytotoxicity is an important factor influencing plant production in acid soils. In the present study, seedlings of four watermelon varieties, chaotiandileiwang（DL）, zaojia84-24（ZJ）, zaomiwang（ZM） and zaochunhongyu（HY）, were used to investigate their growth and physiological characteristics under different Al concentrations（0, 250, 500, 1000, 1500 μmol·L-1）. The inhibitory effects of Al on root length, root vigor and dry weight were greatest for ZM, followed by ZJ and DL, and the least for HY, in which no influences were observed. Thus ZM was more sensitive to Al than HY. Aluminum stress increased the plasma membrane permeability and MDA content in ZM and HY leaves. At Al3+≤1000 μmol·L-1, the breakage of HY membrane system was recovered at a certain level with extension of the treatment time. In addition, Pro content, SOD and POD activities were also increased; while CAT activity was almost not affected by Al. These results show that Al-resistant HY has a better physiological mechanism to respond to Al stress than ZM does, and the Pro content and SOD and POD activities are closely related to Al-tolerant ability of watermelon. |
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