Abstract: In order to illustrate the reproductive growth of tall fescue,the spike differentiation and flowering characteristics of tall fescue were observed periodically throughout the development stages.The results indicate that the spike differentiation was a consecutive process which could be divided into 5 stages: the differentiation stage of bract primordium,the differentiation stage of primary branch primordium,the differentiation stage of secondary and third branches primordia,the differentiation stage of spikelet and floret primordia,and the stage of stamen and pistil primordia formation.The order of flowering had quite strong regularity as the top spikelet of the spike blossomed first,then from up to down,and the basal spikelet blossomed last;the top spikelet of each branch blossomed first,and the basal spikelet blossomed second,then from down to up,and the second spikelet of the branch flowered last;the basal floret of each spikelet blossomed in the bottom-up order.

Key words: Tall fescue, Spike differentiation, Flowering characteristics

摘要： 为阐明高羊茅(Festuca arundinacea Schreb.)的生殖生长过程,2008年4月下旬对高羊茅幼穗分化过程和开花习性进行观察。结果表明:高羊茅幼穗分化是一个连续的过程,可分为苞原基分化期,1次枝梗原基分化期,2、3次枝梗原基分化期、小穗及小花原基分化期、雌雄蕊形成期5个时期;高羊茅开花的规律性很强,总穗轴最上部的小穗最先开花,然后向下进行,基部小穗最后开花;每个枝梗最上部的小穗最先开花,其次是该枝梗基部小穗开花,然后向上进行,上部数第2个小穗最后开花;小穗则是基部小花最先开放,然后向上顺序开放。

关键词: 高羊茅, 幼穗分化, 开花习性