| Biological sciences & biotechnology |
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| Effects of exogenous salicylic acid on antioxidative enzyme activities and physiological characteristics in gerbera ( Gerbera jamesonii L .) grown under NaCl stress |
| Ganege Don Kapila Kumara1,Yi-ping Xia1,Zhu-jun Zhu2,B . M . Vindhya S . Basnayake3,Chalinda K . Beneragama4 |
| Ganege Don Kapila Kumara,Department of Horticulture,College of Agriculture and Biotechnology,Zhejiang University,Hangzhou310029,China; Yi-ping Xia,Department of Horticulture,College of Agriculture and Biotechnology,Zhejiang University,Hangzhou310029,China; Zhu-jun Zhu,School of Agricultural and Food Science,Zhejiang Agriculture and Forestry University,Lin′an,Zhejiang 311300,China; B.M. Vindhya S.Basnayake,Department of Plant Protection,College of Agriculture and Biotechnology,Zhejiang University,Hangzhou 310029,China Chalinda K . Beneragama,Faculty of Agriculture,Peradeniya University,Peradeniya,Sri Lanka |
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Abstract Ameliorative effects of exogenously applied salicylic acid (SA) on salt-induced oxidative damage in gerbera (Gerbera jamesonii L . Amaretto ) at reproductive stage were investigated . At the onset of flower initiation,plants pretreated with the foliar spraying of 0,0.5 and 1.0 mmol.L-1 SA were irrigated with100 mmol.L-1 NaCl (three days after the SA pretreatment) and continued for two weeks . Control plants did not receive either NaCl or SA . As a response to salt stress,superoxide dismutase (SOD) and peroxidase (POD) activities,malondialdehyde (MDA) content,electrolyte leakage as well as the proline accumulation were increased . Nevertheless,SA pretreatment significantly reduced MDA content and electrolyte leakage .SOD and POD activities were significantly higher (1.4-fold and2.4-fold,respectively) in 0.5 mmol.L-1 SA-pretreated salt-stressed plants compared to SA-unpretreated salt-stressed plants . These results indicate that exogenous SA involves,at least in part,in inducing antioxidative defense system in salt-stressed gerbera . In general,of the two concentrations tested,0.5 mmol.L-1 SA concentration seemed to have greater effect throughout the experiment .Responses of salt-stressed plants pretreated with SA and significant correlation among them,predict its future potential as a pragmatic approach to improve salt tolerance in horticultural crops .
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Published: 09 November 2010
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外源水杨酸对盐胁迫下非洲菊抗氧化酶活性和生理特性的影响
以非洲菊(Gerbera jamesonii L.)品种 Amaretto为试材,研究外源水杨酸(SA)对缓解非洲菊生殖生长期因盐胁迫引起的过氧化伤害作用。在开花前分别用0、0.5和1.0 mmol.L-1 SA对非洲菊植 株进行预处理,3 d后用100 mmol.L-1 NaCl灌溉,持续2周;对照植株未经 NaCl和 SA处理 。结果表明:盐胁迫处理后,叶片的超氧化物歧化酶(SOD)和过氧化物酶(POD)活性增加,丙二醛(MDA)含量、电解质外渗率和脯氨酸含量提高;外源 SA预处理显著降低了盐胁迫植株叶片的 MDA含量和电解质外渗率 ;在外源0.5 mmol.L-1 SA预处理后,植株 SOD和 POD活性分别是对照的1.4倍和2.4倍;SA预 处理后与植株耐盐性相关的生理生化指标呈显著相关,以0.5 mmol.L-1 SA处理增强植株盐胁迫耐性 的效果更好。说明外源SA处理能够诱导盐胁迫下非洲菊植株的抗氧化反应,水杨酸将是一种提高园艺作物耐盐性的有效物质 。
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