Masuda Michiko, Washitani Izumi
Department of Biology, College of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro-ku, 153, Tokyo, Japan.
Institute of Biological Sciences, University of Tsukuba, 305, Tsukuba, Ibaraki, Japan.
Oecologia. 1992 Jan;89(1):42-46. doi: 10.1007/BF00319013.
Ecotypes of Galium spurium L. var. echinospermon with distinct germination phenologies were found to occur in two adjacent plots of a grassland nature reserve with different management histories: a spring-germinating population is present in a winter-burnt plot, and an autumn-germinating type in an unburnt plot. These ecotypes share common flowering and fruiting phenologies, and disperse their seeds in early summer. Markedly contrasting thermal dormancy/germination characteristics were demonstrated for their seeds in systematic laboratory tests performed after several types of seed storage including storage in the field. The primary dormancy of seeds of the spring germinator was removed by moist-chilling or field winter-chilling, while that of the autumn germinator was removed by moist storage at 25°C or field summer temperatures. Biseasonal seedling emergence of the species appears to be due to a local differentiation of distinct ecotypes.
在一个具有不同管理历史的草地自然保护区的两块相邻地块中，发现了具有不同萌发物候的刺果猪殃殃变种（Galium spurium L. var. echinospermon）生态型：在冬季火烧的地块中有一个春季萌发种群，在未火烧的地块中有一个秋季萌发类型。这些生态型具有共同的开花和结果物候，并在初夏散播种子。在包括田间贮藏在内的几种种子贮藏类型后进行的系统实验室测试中，证明它们的种子具有明显不同的热休眠/萌发特性。春季萌发者的种子通过湿冷处理或田间冬季低温处理可解除初级休眠，而秋季萌发者的种子通过在25°C湿藏或田间夏季温度下可解除初级休眠。该物种的双季幼苗出土似乎是由于不同生态型的局部分化所致。
