NaCl胁迫对番茄嫁接苗叶片ABA和多胺含量的影响

 以未经NaCl胁迫的番茄自根苗为对照, 研究了100 mmol·L ^{- 1} NaCl胁迫下番茄嫁接苗的生长、叶片ABA和多胺( PAs) 含量的变化。结果表明, 嫁接苗地上部和根的生物量显著高于对照。嫁接苗ABA含量显著高于对照, 胁迫2 d时比对照增加56.60%。胁迫2 d时嫁接苗多胺总量显著高于对照, 比对照增加14.96% , 腐胺( Put) 含量在胁迫2 d后显著低于对照, 亚精胺( Spd) 含量显著高于对照, 胁迫4～8 d之间两者差异不显著, 胁迫10 d时显著低于对照; 精胺( Spm) 含量显著高于对照, 胁迫10 d时比对照增加102.80%。嫁接苗Put/PAs值显著低于对照, 而( Spd + Spm) /Put值显著高于对照。表明NaCl胁迫下嫁接苗生物量显著高于对照, ABA和多胺含量变化显著, 表现出较强的耐盐特征。

Effects of NaCl Stress on ABA and Polyamine Contents in Leaves of Grafted Tomato Seedlings

Taking own-root tomato (Lycopersicon esculentum Mill. ) seedlings not subjected to NaCl stress as control, p lant growth, abscisic acid (ABA) and polyamine ( PAs) contents in leaves of grafted tomato seedlingswere studied under 100 mmol·L ^{- 1} NaCl stress. Results showed that shoot and root biomass production in grafted seedlingswas significantly higher than that in control. ABA content of grafted seedlingswas significantly higher than that of control, increased by 56.60% on the second day of stress. Total polyamine content of grafted seedlingswas significantly higher than that of control, increased by 14.96% on the second day of stress. Putrescine ( Put) content of grafted seedlings was significantly lower than that of control after 2 d ofstress. Spermidine (Spd) content of grafted seedlings was significantly higher than that of control on the second day of stress, but no significant difference was observed during 4 - 8 d of stress, Spd content of grafted seedlings was significantly lower than that of control on the tenth day of stress. Spermine (Spm) content of grafted seedlings was significantly higher than that of control, increased by 102.80% on the tenth day of stress. Put/PAs value of grafted seedlingswas significantly lower than that of control, while ( Spd + Spm) /Putvalue of grafted seedlingswas significantly higher than that of control. The above results indicated that biomass production of grafted seedlings was significantly higher than that of control, ABA and polyamine contents ofgrafted seedlings were significantly changed under NaCl stress, which showed the characteristics of stronger salt tolerance of grafted seedlings.