氯化钙对低夜温胁迫下花生光合作用的调控
首发时间:2013-05-14
摘要:通过人工气候箱盆栽培养试验,分析不同浓度CaCl2对低夜温胁迫(8℃)下花生光合作用相关参数的影响,筛选出低夜温胁迫下提高花生光合作用的适宜Ca2+浓度。结果显示:Ca2+主要通过提高夜间低温胁迫后花生叶片的气孔导度,进而缓解低夜温胁迫导致的花生叶片光合速率的降低,其中,15 mmol/L Ca2+调控效果最好。然后通过叶面喷施15 mmol/L Ca2+及其作用抑制剂(Ca2+螯合剂和钙调蛋白拮抗剂)进一步验证Ca2+对低夜温胁迫下花生光合作用的调控作用,最终证明钙调蛋白(Ca2+-modulin)作为Ca2+的受体,它在Ca2+缓减低夜温胁迫限制花生光合作用的营养信号传导中起到重要作用。
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The regulation of CaCl2 on peanut photosynthesis under the low night temperature stress
Abstract:The effects of the different levels of CaCl2 on photosynthesis under low night temperature (8 ℃) stress in peanut were studied in order to find out the appropriate concentration of Ca2+ through the artificial climate chamber potted culture test. The results indicated that Ca2+, by means of improving stomatal conductivity of peanut leaves under low night temperature, may mitigate the photosynthetic rate decline in the peanut leaves. The regulation with 15 mmol/L CaCl2 (Ca15) enjoyed the most favorable results. The improvement of 15 mmol/L Ca2+ on peanut photosynthesis under low night temperature stress was validated further through spraying with suitable concentration CaCl2, Ca2+ chelator (Ethylene glycol bis(2-aminoethyl) tetraacetic acid; EGTA) and Calmodulin antagonists (Trifluonerazine; TFP). In conclusion, it was found that CaM(Ca2+-modulin)was receptor of calcium fertilizer (Ca2+) and it played a major part in the nutritional signal transduction for Ca2+ mitigating photosynthesis limitations in peanuts under low night temperature stress.
Keywords: plant nutrition peanut Ca2+ low night temperature stress photosynthesis
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No.4542073865850136****
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