Silicon Alleviates Drought Stress of Rice Plants by Improving Plant Water Status, Photosynthesis and Mineral Nutrient Absorption
Silicon Alleviates Drought Stress of Rice Plants by Improving Plant Water Status, Photosynthesis and Mineral Nutrient Absorption
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DOI：
10.1007/s12011-010-8742-x
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发表时间：
2011-07-01
影响因子：
3.9
通讯作者：
Chen, Jining
中科院分区：
文献类型：
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作者：
Chen, Wei;Yao, Xiaoqin;Chen, Jining
干旱是制约中国雨养低地水稻生产的主要因素。硅（Si）在增强植物对环境胁迫的抗性方面发挥着重要作用。以水稻（Oryza sativa L.） 2个近等基因系w-14（干旱敏感）和w-20（抗旱）为材料，研究了外源施硅对干旱胁迫下水稻生理性状和营养状况的影响。在湿润条件下，硅的供应对水稻植株的生长和生理参数没有影响。干旱胁迫降低了水稻植株的干重、根系性状、水势、光合参数、基础量子产量(F （v)/F(0)）和PSII光化学最大量子效率(F (v)/F (m))，而施硅显著提高了干旱胁迫下水稻植株的光合速率（Pr）、蒸腾速率（Tr）、F (v)/F(0)和F (v)/F (m)。此外，水分胁迫提高了水稻植株K、Na、Ca、Mg、Fe含量，但Si处理显著降低了这些养分水平。综上所述，施硅可通过提高水稻光化学效率和调节植物对矿质养分的吸收来提高水稻抗旱性。
Drought is a major constraint for rice production in the rainfed lowlands in China. Silicon (Si) has been verified to play an important role in enhancing plant resistance to environmental stress. Two near-isogenic lines of rice (Oryza sativa L.), w-14 (drought susceptible) and w-20 (drought resistant), were selected to study the effects of exogenous Si application on the physiological traits and nutritional status of rice under drought stress. In wet conditions, Si supply had no effects on growth and physiological parameters of rice plants. Drought stress was found to reduce dry weight, root traits, water potential, photosynthetic parameters, basal quantum yield (F (v)/F (0)), and maximum quantum efficiency of PSII photochemistry (F (v)/F (m)) in rice plants, while Si application significantly increased photosynthetic rate (Pr), transpiration rate (Tr), F (v)/F (0), and F (v)/F (m) of rice plants under drought stress. In addition, water stress increased K, Na, Ca, Mg, Fe content of rice plants, but Si treatment significantly reduced these nutrient level. These results suggested that silicon application was useful to increase drought resistance of rice through the enhancement of photochemical efficiency and adjustment of the mineral nutrient absorption in rice plants.