摘要
干燥番茄（Ｌｙｃｏｐｅｒｓｉｃｏｎ ｅｓｃｕｌｅｎｔｕｍ Ｍｉｌｌ． ｃｖ． Ｍｏｎｅｙｍ ａｋｅｒ）种子浸种吸水有明显的３ 个阶段，尽管种子不同部分吸水的速度不一样，但整粒种子需１０～１２ ｈ 才能基本完成第一阶段的吸水。胚乳对种胚伸长和生长的机械压力明显阻碍种胚的吸水，即使在第二阶段整个种子水势与浸种溶液基本达到水分平衡时，种胚的水势仍然低于整个种子水势０．６～０．９ ＭＰａ。发芽过程中ＧＡ 和ＡＢＡ不直接影响番茄种子吸水。番茄种胚水势与含水量的关系呈幂指数的正相关。无论在浸种还是渗控处理过程中。
Water uptake of tomato (Lycopersicon esculentum Mill.cv. Moneymaker) seeds during germination was obviously triphasic.The completion of the first phase of water uptake by whole seed could not be realized until 10～12 h later after sowing though varies in different parts of seed.The mechanical resistance of endosperm and seed coat restricted water uptake of the embryo envoleped by the endosperm.Water potential of the intact embryo was still 0 6～0.9 Mpa lower than the whole seed when the equilibrium between seed and imbibing solution was established. GA and ABA had no direct effects on the water uptake of tomato seeds.The water potential of embryo was positively correlated with its moisture content.The osmotic potential of tomato embryos decreased slowly during imbibition in water and osmotic solution as well.
基金
国家教委留学回国人员启动基金
湖南农业大学青年科学基金
关键词
番茄
种子
发芽
水分关系
ABA
GA
Germination
Tomato seed
Water relations
