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外源脯氨酸对镉胁迫下小麦幼苗生长的影响
引用本文:赵本良,彭卉,章家恩,戴晓燕,彭莉.外源脯氨酸对镉胁迫下小麦幼苗生长的影响[J].生态学杂志,2013,32(1):129-134.
作者姓名:赵本良  彭卉  章家恩  戴晓燕  彭莉
作者单位:(曲阜师范大学生命科学学院, 山东曲阜 273165)
基金项目:国家自然科学基金项目(U1131006、30770403和30900187);广东省科技计划项目(2007B020709007);广东省高等学校高层次人才项目(粤教师函[2010]79号);广东省引进国(境)外高层次人才智力项目(粤外专[2010]51号)资助
摘    要:以高蛋白小麦品种“北农9549”为试材,研究喷施不同浓度脯氨酸(0、1.0、5.0和10.0 mmol·L-1)对镉胁迫下小麦幼苗生长和重金属吸收的影响.结果表明: 以不施镉为对照,1.0 mmol·L-1CdCl2胁迫下,小麦幼苗的根长、株高和干质量分别显著下降24.0%、15.0%和27.5%,叶绿素a、b和类胡萝卜素含量分别显著下降23.3%、6.7%和30.8%,超氧化物歧化酶(SOD)活性降低了18.4%,内源脯氨酸、抗坏血酸和丙二醛(MDA)含量分别显著上升78.6%、31.5%和17.9%,细胞膜相对透性显著升高24.8%,过氧化物酶(POD)活性为对照的2.4倍,并且促进对铜的吸收,抑制锌的吸收.随外源脯氨酸浓度的增加,小麦幼苗的根长、株高、干质量、叶绿素和类胡萝卜素含量均逐渐恢复到对照水平,抗坏血酸、内源游离脯氨酸含量和SOD活性均上升,可溶性蛋白含量先上升后下降,POD活性、MDA含量和细胞膜相对透性下降,而锌积累量升高,镉、铜积累量下降.叶面喷施外源脯氨酸可缓解镉对小麦幼苗生长的胁迫,以喷施5.0~10.0 mmol·L-1外源脯氨酸效果最佳.

关 键 词:脯氨酸  镉胁迫  重金属  小麦

Lead removal from aqueous solution by the shell of golden apple snail and related mechanisms
ZHAO Ben-liang,PENG Hui,ZHANG Jia-en,DAI Xiao-yan,PENG Li.Lead removal from aqueous solution by the shell of golden apple snail and related mechanisms[J].Chinese Journal of Ecology,2013,32(1):129-134.
Authors:ZHAO Ben-liang  PENG Hui  ZHANG Jia-en    DAI Xiao-yan  PENG Li
Institution:(College of Life Science, Qufu Normal University, Qufu 273165, Shandong, China)
Abstract:Taking high protein wheat variety ‘Beinong 9549’ as test material, this paper studied the effects of foliage spraying different concentration (0, 1.0, 5.0 and 10.0 mmol·L-1) proline on the growth and heavy metal uptake of wheat seedlings under cadmium stress. Under the stress of 1.0 mmol·L-1 of CdCl2, the root length, plant height and dry mass, leaf chlorophyll a and b and carotenoid contents of the seedlings decreased significantly by 24.0%, 15.0%, 27.5%, 23.3%, 6.7% and 30.8%, respectively, the leaf superoxide dismutase (SOD) activity decreased by 18.4%, the leaf proline, ascorbic acid and malondialdehyde (MDA) contents and the membrane permeability increased significantly by 78.6%, 31.5%, 17.9% and 24.8%, respectively, the leaf peroxidase (POD) activity was 2.4 folds higher, and the Cu uptake was promoted while the Zu absorption was inhibited, compared with the control. With the increasing concentration of sprayed proline, the root length, plant height and dry mass, and leaf chlorophyll a and b and carotenoid contents increased gradually to the levels of the control, the leaf proline and ascorbic acid contents and the leaf SOD activity increased, the leaf soluble protein content decreased after an initial increase, the leaf POD activity, MDA content and membrane permeability decreased, and the Zn accumulation increased while the Cd and Cu accumulation decreased. In sum, foliage-spraying proline could alleviate the cadmium stress on the growth of wheat seedlings, and spraying 5.0-10.0 mmol·L-1 of proline could obtain the best effect.
Keywords:proline  cadmium stress  heavy metal  wheat  
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