银车轴草繁殖策略及二型种子萌发。,两栖动物

I. F. Conterato, M. T. Schifino-Wittmann, D. B. David, Jorge Martins
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引用次数: 1

摘要

原产于南里奥格兰德州的天然牧场,阿根廷三叶草。通过空中和地下种子进行有性繁殖(两果),通过储存根的再生进行营养繁殖。在本研究中,评估了土壤表面花朵产生的种子、对地上和地下种子发芽的深度效应和松土作用,以及由这两种种子衍生的植物产生的贮藏根。地上种子(0.10厘米)和土壤表面种子(0.11厘米)的大小相似,但比地下种子(0.14厘米)小,三种种子的产量没有显著差异。在2.5厘米深翻松并播种的空中和地下种子比在土壤表面和7.0厘米深翻松土和未翻松的种子发芽更好,对种子发芽表现出深度效应。尽管具有两亲性,阿根廷T.argetinese首先投资于储存根的生产,以确保特定基因型的克隆,并使植物年复一年地保持植被,而不需要在不利的有性繁殖环境中通过种子再生,例如在南里奥格兰德州的天然牧场,在那里,剧烈的放牧和践踏会破坏植物的空中部分。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Reproductive strategies and dimorphic seeds germination in Trifolium argentinense Speg., an amphicarpic species
Native from Rio Grande do Sul natural pastures, Trifolium argentinense Speg. has sexual reproduction through aerial and subterranean seeds (amphicarpy) and vegetative reproduction by regrowth from storage roots. In this study the seeds produced at the soil-surface flowers, the depth effect and scarification on the aerial and subterranean seeds germination and the storage roots produced by plants derived from the two types of seeds were evaluated. The aerial (0.10 cm) and soil-surface (0.11 cm) seeds were similar in size, but smaller than the subterranean seeds (0.14 cm), with no significant variation in the production of the three types of seeds. Aerial and subterranean seeds scarified at and sowed 2.5 cm deep germinated better than the scarified and non-scarified seeds sowed on the soil-surface and at 7.0 cm, evincing a depth effect on seed germination. Although amphicarpic, T. argentinense first invests in the production of the storage roots making sure the cloning of specific genotypes and allowing the plants to persist vegetatively year after year without the need for regeneration by seeds in unfavorable environments for sexual reproduction, such as in Rio Grande do Sul natural pastures, where hard grazing and trampling can destroy the aerial part of the plants.  
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