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Physiological responses of needles of Pinus massoniana elite families to phosphorus stress in acid soil

Journal of Forestry Research 2013年第2期24卷 325-332页

作者： HE You-lan LIU Ai-qin Mulualem Tigabu WU Pengfei MA Xiang-qing WANG Chen Per Christer Oden Forestry College Fujian Agriculture and Forestry University Swedish University of Agricultural Sciences Faculty of Forest Science Southern Swedish forest Research Centre

Pinus massoniana Lamb. is a major timber species widely planted in the South China, where the soil is acidic and deficient in phosphorus （P） due to fixation by aluminum and iron. Understanding the physiological responses to rhizospheric insoluble P is essential for enhancing plantation productivity. Thus, a sand culture experiment was conducted with four levels of P treatment （0, 5, 20 g insoluble P and 10 g soluble P）, and 11 P. massoniana elite families. Physiological responses were measured after two months of stress. Compared to the normal soluble P treatment, the insoluble P treatment significantly reduced the proline content and the APase activity in the needles, while it significantly increased the catalase activity by 1.3-fold and malondialdehyde content by 1.2-fold. Soluble protein content was unaffected by the treatments, but chlorophyll content was significantly lower in P-deprived treatment compared with soluble and insoluble P treatments. These physiological responses also exhibited highly significant variation among families （p 〈 0.01）. The findings suggest that increased catalase activities in the presence of insoluble P might be involved in the activation of an anti-oxidation defense mechanism that scavenges the reactive oxygen species elicited by the stress. And this response has a strong genetic control that can be exploited to identify desirable genotypes.

关键词： Masson pine phosphorus stress anti-oxidative system lipid peroxidation

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