首页|Difference of Low Temperature and Low Irradiance-Resistance between Figleaf Gourd and Cucumber Seedlings Related to Mineral Elements Uptake

Difference of Low Temperature and Low Irradiance-Resistance between Figleaf Gourd and Cucumber Seedlings Related to Mineral Elements Uptake

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We have repotted that the roots of fig, leaf gourd (Cucurbita ficifolia, as rootstock) could improve the resistance of cucumber seedlings (Cucumis sativus L.cv. Jinyan 4, as scion) to 6 h stress at low temperature and low irradiance [1]. In this experiment, the relationship between the mineral elements uptake and photosynthetic activity of photosystems in figleaf gourd and cucumber seedlings were to be studied during low temperature (8 C) stress under low irradiance (100 μ. mol m-2 s-1 PFD) for 5 days. Compared with control seedlings, the maximal photochemical efficiency of PS2 (Fv/Fm) and the oxidizable P700 (P700+) of both figleaf gourd and cucumber seedlings decreased, and beth Fv/Fm and P700+ were lower in cucumber leaves than in figleaf gourd seedlings at the end of the stress. Superoxide dismutase (SOD) activity was higher in beth leaves and roots of figleaf gourd than in leaves and roots of cucumber at both room temperature and low temperature. However, the product rate of O 2 was lower in figleaf gourd leaves than in cucumber leaves. Upon ex-posure to the stress, the malondialdehyde (MDA) content increased markedly in leaves and roots of figleaf gourd and cucumber seedlings, and it grew faster in cucumber seedlings than that in figleaf gourd seedlings. Under adaptive conditions, some mineral elements (Such as Cu, Zn, Mn and Mg) have different contents in leaves and roots between figleaf gourd seedlings and cucumber seedlings. However, at the end of the stress these elements were accumulated apparently in both leaves and roots of figleaf gourd accompanied by no obvious change in cucumber seedlings.

cucumberfigleaf gourdlow temperature stressphotoinhibitionmineral elements uptake

LI Jian-Yong、GUO Shang-Jing、LI Xin-Guo、MENG Jing-Jinga、HE Qi-Wei

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High-Tech Research Center, Shandong Academy of Agricultural Sciences, Ji'nan, Shandong, 250100, China

Ji'nan Entry-exit Inspection Quarantine Bureau of the People's Republic of China, Ji'nan, 250100,China

Key Laboratory for Genetic Improvement of Crop, An

Graduate Office, Liaocheng University, Liaocheng, 252059, China

Key Laboratory for Genetic Improvement of Crop, Animal and Poultry of Shandong Province, 250100, China

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国家自然科学基金国家自然科学基金Scientific Research Encouragement Foundation for Outstanding Young and Middle aged Scientists of Shandong Province, China

30571126306712422005BS06003

2009

现代农业科学
华中农业大学

现代农业科学

ISSN：1005-4650
年,卷(期)：2009.16(3)
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