《植物生理学报》 2017, 53(5): 873-880
通信作者:史春余;E-mail: scyu@sdau.edu.cn
摘 要:
选用食用型甘薯品种‘泰中6号’为材料, 以正常灌水处理为对照, 研究干旱胁迫下外源喷施脱落酸(ABA)对甘薯叶片光合特性及相关生理指标的影响。结果表明: 干旱胁迫使甘薯叶片脯氨酸、过氧化氢(H2O2)、丙二醛(MDA)含量增加, 外源ABA处理能减少MDA的积累, 使其含量处于较低水平。外源ABA能够提高叶片净光合速率(Pn), 降低气孔导度(Gs)和蒸腾速率(Tr), 提高水分利用效率(WUE)。ABA处理能防止叶绿素降解并对干旱引起的最大光能转化效率(Fv/Fm)、实际光化学效率(ΦPSII)、光化学猝灭系数qP下降及非光化学猝灭系数(NPQ)升高有明显的缓解作用。干旱胁迫下, H2O2的积累伴随着具有抗氧化作用的SOD和POD酶活性的提高, 而ABA处理能增加H2O2的积累, 并进一步提高这些酶的活性。干旱胁迫下, 外施ABA能增强甘薯的抗氧化防护系统, 提高水分利用效率, 提高甘薯的抗旱性。正常灌水条件下外施 ABA对甘薯生长前期叶片生理特性的影响作用不显著。关键词:甘薯; 干旱胁迫; ABA; 光合特性; 抗氧化酶
收稿:2017-03-08 修定:2017-04-14
资助:国家自然科学基金项目(31371577)、山东省现代农业(薯类)产业技术体系(SDAIT-10-021-18)、山东省农业科学院农业科技创新工程(CXGC2016B04)和泰安市农业良种工程项目(2015LZ06)。
Corresponding author: SHI Chun-Yu; E-mail: scyu@sdau.edu.cn
Abstract:
Using sweetpotato (Ipomoea batatas) cultivar ‘Taizhong 6’ as material and the regular water supply as control, the effects of exogenous ABA on leaf photosynthetic characteristics and associated physiological indexes under drought stress were studied. The results showed that the contents of proline, H2O2 and MDA were increased under drought stress. The exogenous ABA treatment alleviated the increase of MDA, improved leaf Pn, decreased Gs and Tr, and increased WUE in sweetpotato plants under drought stress. The ABA application prohibited the degradation of chlorophyll and alleviated the decrease of maximal PSII efficiency (Fv/Fm) and quantum efficiency of PSII (ΦPSII) and the increase of non-photochemical quenching coefficient (NPQ). Under drought stress, H2O2 accumulation was associated with the increasing activities of SOD and POD, and ABA application could increase H2O2 accumulation by further improving activities of these enzymes. Our results illustrated that exogenous ABA could enhance antioxidant defense system, increase water use efficiency, and improve drought resistance of sweet potato under drought stress. Nevertheless, under regular water supply conditions, the effect of exogenous ABA on leaf physiological property during earlier growth stage of sweetpotato was not significant.Key words: sweetpotato (Ipomoea batatas); drought stress; ABA; photosynthetic characteristics; antioxidant enzymes
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