外源调节剂对低温胁迫下荔枝幼苗生长生理的影响
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中图分类号：S667.1 文献标识码：A
Effects of Exogenous Regulators on The Growth and Physiology of Lychee Seedlings under Low-Temperature Stress
LIU Wenwei1 ，LONG Weiping² （1.Hechun Town Rural Industry Development Service Center，Lianjiang Guangdong 5244Oo，China; 2.Lianjiang Agricultural Technology Extension Center，Lianjiang Guangdong 5244Oo，China）
Abstract：【Objective】To compare the growth and physiological responses of lycheesedlings to low-temperature stress underdiffrentexogenous regulatortreatmentsandtoexploreregulators thatcanenhancethecoldresistanceoflyhee.【Methods】Using orthogonal experimentaldesign，thestudyanalyzedthechanges in growthand physiologicaland biochemical indicators of lychee seedlings after low-temperature stress under 16 treatments combining 0～4mg/L brassinolide， 0～150mg/L （20 calcium nitrate，and 0-100mg/L spermidine.【Results】 Compared with the control，any of the tested exogenous regulator treatments significantly increased seedling height.The maximum height increment was observed under the treatment of 4mg/L brassinolide +50mg/L calciumnitrate +50mg/L spermidine，with an increase of 245.5% over the control. The correlation betweenseedling height growthandchlorophyllcontent wasthemostsignificant，andchlorophyllcontent wassignificantlycorre lated with the activities of SODand POD，aswellas withthecontents of soluble sugar，soluble protein，andfree proline. Comprehensive evaluation through principal componentanalysis indicated thatthe growthandphysiologicalperformanceof ly chee seedlings under low-temperature stress was optimal under treatments of 2～4mg/L brassinolide +50mg/L calcium nitrate *50～100mg/L spermidine. 【Conclusion】 In the future，scientifically applying a composite regulator composed of brassinolide，calciumnitrate，andspermidinecanachievegoodcultivationresultsinenhancingthecoldresistanceoflycheesedlings in Lianjiang，Guangdong.
Key words： lychee；cold resistance；regulators；growth physiology
荔枝（LitchichinensisSonn.）属无患子科荔枝属常绿乔木，其果实味甘、性温，具有补脑健身、开胃益脾的功效，在果品市场上销量极高。（剩余5275字）