顽拗型种子的生物学特性及种子顽拗性的进化

综述了顽拗型种子的形态、大小、含水量、植物分类、植物生态方面的一般特性,分析了顽拗型种子对环境的生态适应性,并讨论了种子顽拗性的可能进化模式,进而指出顽拗型种子生理生态学研究的意义和应用前景.顽拗型种子一般千粒重和体积较大,含水量较高,萌发迅速且多无休眠特性;产生顽拗性种子的植物分布很广,与其系统分类地位无关,但多起源于湿润的生境;目前尚无足够的证据表明种子顽拗性是原始性状或是衍生性状,要解决这一问题还需更深入的研究,尤其是种子生理学和生态学家的合作研究.

Biological characteristics of recalcitrant-type seeds and evolution of seed recalcitrance

In this paper, the general characteristics of the morphology, size, moisture content, taxonomic classification, and plant ecology of recalcitrant-type seeds were reviewed, with the adaptability of recalcitrant-type seeds to ecological environment analyzed, their possible evolution patterns discussed, and the significances and application prospects of the researches on seed recalcitrance eco-physiology described. Recalcitrant-type seeds generally have great 1000-seed weight, big size and high moisture content, germinate quickly, and have no dormancy. The plants producing recalcitrant-type seeds are distributed extensively and have no relation to their systematic status, but all originate in humid habitats. There are no sufficient evidences to prove whether seed recalcitrance is ancestral or derived, which is needed to be solved by further researches, especially by the cooperative researches of seed physiologists and ecologists.