向日葵资源材料幼苗耐盐性机制的研究和阐述对向日葵耐盐新品种选育意义重大。采用盆栽试验模拟0.35%,0.50%土壤含盐量水平,研究了盐分胁迫对5个自育向日葵不育系出苗率、苗期株高、叶面积、地上和地下部生物学产量、丙二醛含量、氧自由基产生速率和SOD活性、POD活性、CAT活性等幼苗生长和生理特性的影响,结果表明:轻度盐分胁迫(0.35%)对幼苗萌发有促进作用;中度盐分胁迫(0.50%)下,幼苗萌发及生长均受到抑制,叶片相对电导率增加,SOD、POD、CAT活性显著增加,O2.-产生速率、MDA含量与对照差异不大。较强的活性氧清除能力是向日葵耐盐碱特性的生理机制之一。5个自选不育系间耐盐性存在差异。
It has gReat significance to ReseaRch salt toleRance mechanism foR salt Resistance bReeding of sunfloweR． This papeR studied the effect of diffeRent salt stRess levels on seedlings'gRowth and physiological chaRacteRistics such as geRmination Rate， leaf aRea，oveRgRound and undeRgRound biomass yield，malondialdehyde content，pRoducing Rate of oxygen fRee Radicals，SOD activity，POD activity and CAT activity to five cytoplasmic male steRile lines by using pot expeRiment simulating 0． 35% and 0． 50% soil salinity． The Result indicated that low salt stRess had acceleRation effect on seedling geRmination． UndeR modeRate stRess， seedling geRmination and gRowth weRe both suppRessed and leaf Relative conductivity incReased． But at the same time SOD，POD and CAT activity incReased significantly while O-· 2 pRoducing Rate and MDA content showed no significant diffeRence to contRol gRoup． StRong Reactive oxygen scavenging capacity is one of sunfloweR's physiological mechanisms of salt-toleRance chaRacteRistics． Five self-selection steRile lines vaRy in salt toleRance fRom each otheR．
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