弱光胁迫对太阳扇扦插苗形态和生理特性的影响  

Effect of Weak Light Stress on Features and Physiological Characteristics of Scaevola aemula Cutting Seedlings

作　　者：秦华军[1] 何丙辉[1] 蔡兴华[1] 于传[1] 

机构地区：[1]西南大学资源环境学院西南大学三峡库区生态环境教育部重点实验室,重庆400715

出　　处：《河南农业科学》2013年第9期103-107,共5页Journal of Henan Agricultural Sciences

基　　金：国家林业局公益性行业科研专项(201104043);重庆市科技攻关重点项目(CSTC2009AB1115);西南大学青年基金项目(SWU208048);西南大学生态学重点学科“211工程”三期建设项目

摘　　要：将太阳扇扦插苗分别置于光照百分率为100％（对照）、45％和15％的人工控制光环境下处理，研究弱光胁迫对太阳扇扦插苗形态和生理特性的影响。结果表明，光照强度对太阳扇扦插苗的形态和生理特征有显著影响，随着弱光胁迫强度的增加和胁迫时间的延长，太阳扇叶片数逐渐减少，叶片变薄变黄，受害指数显著增大。在45％全光照胁迫短时间（15d）内，太阳扇能正常生长，植株叶片中叶绿素a（Chla）、Chlb和总叶绿素EChl（Total）]含量显著增大，类胡萝卜素（Car）、Car／Chl（Total）和Chla／b值显著减小，可溶性蛋白质含量和POD活性与对照无显著差异。在45％全光照或15％全光照胁迫短时间（15d）内，可溶性糖、丙二醛（MDA）含量和SOD活性均显著减小。在15％全光照胁迫短时间（15d）内，叶片中总叶绿素含量与对照无显著差异。在15％全光照胁迫长时间（30～60d）内，太阳扇生长困难，与对照相比，可溶性蛋白质、MDA（60d除外）含量和POD、SOD活性均显著增加。弱光胁迫能抑制太阳扇的MDA和可溶性糖等的产生，诱导叶绿素、可溶性蛋白、SOD和POD等的生成，形成应对弱光胁迫的协同生理响应体系。The cutting seedlings of Sunfan were put under controlled lighting environments, with the full lighting percentage of 100%,45% and 15%,respectively. The result showed that illumi- nation intensity obviously impacted the growth of cutting seedlings. With the enhancement of weak light stress and the extension of time, leaves became less with smaller area and thinner pants,resulting in higher victimization index. In a short time （15 days） in the 45% light transmi- ttance of the light stress, the plants grew normally, Chl a, Chl b, Chl （Total） value increased ob- viously,but Car, Car/Chl（Total）, Chl a/b value visibly decreased. No obvious differences were found in soluble protein and POD activity. In a short time（15 days） in the 45% or 15% light transmittance,soluble sugar, MDA and SOD activity obviously decreased. In a short time （15 days） in the 15% light transmittance of the light stress, chlorophyll in leaves had no obvious difference. In a long time （30--60 days） in the 15 % light transmittance, compared with the con- trol, the plants grew difficultly and showed extremely significant difference;Soluble protein, MDA content, POD and tion of MDA and stances, SOD and light stress. SOD activity were obviously increased. Weak light stress can inhibit the producsoluble sugar and induce chlorophyll, soluble protein,osmotic adiustment sub- POD, forming synergistic physiological response system to response to week

关 键 词：太阳扇 弱光胁迫 形态变化 生理响应 

分 类 号：S682[农业科学—观赏园艺]