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甜菜碱对干旱胁迫下湖北海棠超微弱发光及抗氧化能力的影响

Effects of glycinebetaine on ultraweak luminescence and anti-oxidative capability of Malus hupehensis under drought stress.

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【作者】 接玉玲赵海洲张伟杨洪强李德全束怀瑞

【Author】 JIE Yuling, ZHAO Haizhou, ZHANG Wei, YANG Hongqiang, LI Dequan, SHU Huairui (College of Horticulture, Shandong Agricultural University, Tai’an 271018, Shandong, China).

【机构】 山东农业大学园艺科学与工程学院山东农业大学园艺科学与工程学院 山东泰安271018山东泰安271018

【摘要】 以盆栽4年生的苹果砧木湖北海棠(Malushupehensis)为试材,叶面喷施100mmol·L-1的甜菜碱,研究外源甜菜碱对干旱胁迫下湖北海棠叶片超微弱发光(UWL)、丙二醛(MDA)、超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢(H2O2)、脯氨酸(Pro)及甜菜碱(GB)含量的影响.结果表明,轻度干旱胁迫下,叶片UWL强度提高,但随着干旱胁迫程度的加重而下降,至严重干旱胁迫时UWL明显低于正常供水处理;H2O2、MDA含量随干旱胁迫加重而升高;SOD和POD活性随胁迫加重而升高,但至重度干旱时下降.与单独干旱处理相比,叶片喷施甜菜碱显著提高了轻度和中度干旱胁迫叶片的UWL(分别提高35·27%和43·95%)、SOD和POD活性,降低了H2O2和MDA含量;促进了Pro和GB的积累.表明甜菜碱及通过甜菜碱诱导的脯氨酸积累,能够提高干旱胁迫下叶片的抗氧化能力,减轻过氧化损伤,对叶片细胞起到保护作用.

【Abstract】 In a pot experiment with 4-year-old apple root stock (Malus hupehensis), this paper studied the effects of foliar-spraying exogenous glycinebetaine (GB) on the leaf ultraweak luminescence (UWL), contents of malondialdehyde (MDA), hydrogen peroxide (H2O2), endogenous GB and proline (Pro), and activities of superoxide dismutase (SOD) and peroxidase (POD) under drought stress. The results showed that UWL intensity increased under slight- and mid drought stress, but decreased with increasing drought stress till lower than the control. Under slight- and mid drought stress, foliar-spraying GB improved the UWL intensity by 35.27% and 43.95%, respectively, decreased H2O2 and MDA contents, increased SOD and POD activities, and promoted the accumulation of GB and Pro. The exogenous GB and its induced Pro accumulation could increase the anti-oxidative capability of M. hupehensis leaves, and protect the leaf cells from oxidative damage under drought stress.

【基金】 山东省优秀中青年科学家奖励基金项目(02BS021);国家自然科学基金资助项目(30270923,30571285).
  • 【文献出处】 应用生态学报 ,Chinese Journal of Applied Ecology , 编辑部邮箱 ,2006年12期
  • 【分类号】S661.1
  • 【被引频次】35
  • 【下载频次】447
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