外源多胺对富士苹果花和幼果内源多胺与激素的影响

 红富士苹果花和幼果内均含有腐胺(Put) 、亚精胺(Spd) 和精胺(Spm) , 其中以Spd 含量最高。盛花期喷施1 ×10^-5mol·L^-1的Spd , 可提高花和幼果内GA₃ 、ZR 的含量, 但IAA、ABA 含量下降; 喷施多胺合成抑制剂MGBG降低了喷后10 d 幼果内GA₃ 含量, 却提高了花和幼果内IAA 含量; 对内源多胺的测定结果表明, 盛花期喷施Spd 提高了喷后20 d 幼果内源Put 、Spd 及Spm含量, 降低了花内的含量; 喷施MGBG提高花和幼果内Put 含量, 降低Spd及Spm含量。田间试验结果表明, 盛花期喷施1 ×10^-5mol ·L^-1的Spd , 坐果率为对照的144. 1 % , 而喷施1 ×10^-5mol ·L^-1的MGBG, 坐果率为对照的86. 2 %。

Effects of Exogenous Spermidine on the Levels of Endogenous Hormones and Polyamines in the Flowers and Fruitlets of Red Fuji Apple

Effects of exogenous polyamines and their biosynthesis inhibitor MGBGon fruit set and the contents of the endogenous hormones and polyamines during flowering and fruit setting were studied with Red Fuji apple. The results showed that application of Spd at 1 ×10^-5mol·L^-1 at full bloom could increase fruit set and the contents of GA3 and ZR in the flowers and fruitlets of Red Fuji apple , but reduced IAA and ABA contents. MGBG basically had an opposite effects. The Spd treatment could also increase endogenous Put , Spd and Spm contents in the fruitlet of Red Fuji apple , but reduced their contents in the flowers , MGBG treatment decreased the endogenous Spd contents but increased Put contents.