Grafting Enhances Copper Tolerance of Cucumber Through Regulating Nutrient Uptake and Antioxidative System

ZHANG Zi-kun; LI Hua; ZHAG Yu; HUANG Zhi-jun; CHEN Kun; LIU Shi-qi

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Grafting Enhances Copper Tolerance of Cucumber Through Regulating Nutrient Uptake and Antioxidative System

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An experiment was carried out to determine plant growth, mineral uptake, lipid peroxidation, antioxidative enzymes, and antioxidant of cucumber plants (Cucumis sativus L. cv. Xintaimici) under copper stress, either ungrafted or grafted onto the rootstock (Cucurbita ficifolia). Excess Cu inhibited growth, photosynthesis, and pigment synthesis of grafted and ungrafted cucumber seedlings and significantly increased accumulation of Cu in roots besides reducing mineral uptake. Cu concentration in roots of grafted cucumber plants was significantly higher than that of ungrafted plants and obviously lower in leaves. The accumulation of reactive oxygen species (ROS) significantly increased in cucumber leaves under Cu stress and resulted in lipid peroxidation, and the levels of ROS and lipid peroxidation were greatly decreased by grafting. Activities of protective enzymes (superoxide dismutase, SOD; peroxidase, POD; catalase, CAT; ascorbate peroxidase, APX; dehydroascorbate reductase, DHAR; glutathione reductase, GR) and the contents of ascorbate and glutathione in leaves of grafted plants were significantly higher than those of ungrafted plants under Cu stress. Better performance of grafted cucumber plants were attributed to the higher ability of Cu accumulation in their roots, better nutrient status, and the effective scavenging system of ROS.

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《农业科学学报（英文版）》 |2010年第12期|1758-1770|共13页
作者
ZHANG Zi-kun; LI Hua; ZHAG Yu; HUANG Zhi-jun; CHEN Kun; LIU Shi-qi;
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College of Horticulture Science and Engineering Shandong Agricultural University/State Key Laboratory of Crop Biology Ministry of Science and Technology/Key Laboratory of Horticultural Crop Biology Ministry of Agriculture Tai'an 271018 PR.China;

Dezhou Academy of Agricultural Science Dezhou 253015 P.R.China;

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Grafting Enhances Copper Tolerance of Cucumber Through Regulating Nutrient Uptake and Antioxidative System

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