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太阳辐射减弱对冬小麦叶片光合作用膜脂过氧化及同化物累积的影响

Keywords: 太阳辐射减弱,冬小麦,光合作用,膜脂过氧化,同化物

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Abstract:

为了探究气溶胶的太阳辐射减弱效应对农作物叶片生理特性及同化物累积的影响,以扬麦13为供试材料,在大田试验条件下系统研究了不同辐射减弱处理(100%、60%、40%、20%、15%)对冬小麦叶片光合作用、膜脂过氧化水平和同化物积累的影响。结果表明:太阳辐射减弱至自然光的60%~15%时,冬小麦叶片净光合速率减少15.8%~70.1%,光合色素的含量(叶绿素a、b和类胡萝卜素)显著提高,其中叶绿素b含量的增加最明显。太阳辐射减弱会抑制冬小麦叶片膜脂过氧化程度,减少细胞膜透性,且辐射减弱的程度越高,影响越大。当太阳辐射为自然光的60%~15%时,冬小麦叶片的可溶性糖含量比对照降低了32.22%~76.45%,可溶性蛋白含量降低了19.02%~48.12%,但总游离氨基酸含量比对照增加了47.46%~177.87%。上述结果表明,太阳辐射减弱后会减弱冬小麦光合作用,增加光合色素含量,抑制膜脂过氧化程度,从而导致作物体内同化物的累积受阻,糖类及蛋白质的含量显著降低,必然会影响作物的产量及品质形成。

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