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为探讨普通野生稻 Oryza rufipogon Griff.的生态分化式样 ,对中国的 31个天然居群及其生境进行了考察。通过对其生活史特性、生长习性、抽穗光周期、百粒重和繁育系统的初步观察后得到如下结果 :1)在中国没有发现一年生的天然居群 ;2 )随着纬度的升高 ,普通野生稻的繁育系统有从无性生殖向有性生殖偏移的趋势 ;3)适应日照长度变化的结果使其始穗期有随着纬度的升高而提早的趋势 ;4 )茎的生长习性的多型性与周围栽培稻的基因流有关 ,在小生境中水分条件的差异亦可导致生长习性从匍匐到直立的渐变。但是 ,等位酶分析的结果表明同一居群内具有不同生长习性的类型之间没有明显的遗传分化
In order to investigate the ecological differentiation patterns of Oryza rufipogon Griff., 31 natural populations and their habitats in China were investigated. The following results were obtained from the preliminary observation of its life history characteristics, growth habit, heading period, 100-grain weight and breeding system: 1) There was no annual natural population found in China; 2) With the increase of latitude, The breeding system of wild rice has the tendency of changing from asexual reproduction to sexual reproduction; 3) the result of adapting to the change of the length of the sunshine has the tendency that the beginning of the rice grows with the increase of the latitude; 4) Polymorphism is related to the gene flow in the surrounding cultivated rice. Differences in water conditions in niche can also lead to a gradual change in growth habit from prostrate to upright. However, the results of allelic enzyme analysis showed that there was no significant genetic differentiation between the types of individuals with different growth habitat within the same population