亏缺灌溉对枸杞果实糖积累和蔗糖代谢相关酶活性的影响

通过控制灌溉量将土壤水分控制在18.20%(T1),19.50%(T2),20.60%(T3),22.40%(T4),23.50%(T5)不同的水平上,研究亏缺灌溉对枸杞果实糖积累和蔗糖代谢相关酶活性的影响.结果表明:随水分胁迫的增强,不同处理枸杞果实百粒重呈下降趋势,严重亏缺灌溉的T5百粒重显著低于其它处理;在枸杞全生育期果实己糖(葡萄糖、果糖)积累量递增,蔗糖积累量逐渐下降.且随亏缺灌溉的加重,红果期各处理果实己糖、蔗糖含量差异显著,其中T1、T2显著高于T5;枸杞果实全生育期转化酶活性保持在较高水平,呈先上升后下降趋势,红果期其活性下降保证了蔗糖的积累;蔗糖合成酶和蔗糖磷酸合成酶活性较低,呈下降趋势.且随水分胁迫的加强,合成酶活性呈上升趋势,这与水分胁迫愈重,愈有利于蔗糖积累相一致.亏缺灌溉提高了果实中己糖积累,改善了果实品质,但严重亏缺会降低果实产量.

Effects of deficit irrigation on accumulation of sugar and activity of sugar metabolism-related enzymes of Lycium barbarum L.

A study was conducted on the effects of water deficit on accumulation of sugar and activity of sugar metabolism-related enzymes of Lycium barbarum through controlling irrigation amount to keep the soil water at different levels(T1,18.20%;T2,19.50;T3,20.60%;T4,22.40%;T5,23.50%).The results showed that the 100-grain weight presented a descending trend with the intension of water stress,and it was significantly lower in T5 than that in other treatments.The hexose content(glucose and fructose) of Lycium barbaru...