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首页> 外文期刊>Seed Science Research >Germination ecology of the perennial Centaurium somedanum, a specialist species of mountain springs
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Germination ecology of the perennial Centaurium somedanum, a specialist species of mountain springs

机译：多年生的半人马半山花的发芽生态学

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摘要

To improve understanding of how a rare endemic species of Centaur/urn adapts to a specialized ecological niche, we studied the germination ecology of the mountain spring specialist, C. somedanum, a perennial species restricted to an unusual habitat for this genus. We conducted laboratory experiments with fresh seeds collected from two populations for three consecutive years, to investigate: (1) the effect of temperature and light on germination; (2) the existence of seed dormancy; and (3) inter-population and inter-annual variation in germinability. Germination occurred only in the light and at relatively low temperatures (15-22 degrees C) with no differences between constant and alternating regimes, and a significant decrease at high temperatures (25 degrees C and 30 degrees C). We found non-deep simple morphophysiological dormancy and variation in seed germinability depending on the year of seed collection. C. somedanum diverged from the common germination characteristics of the genus in: (1) its germination at lower temperatures, which contrasts with what is generally expected in wetland species but could be adaptive in the spring habitat; and (2) its morphophysiological dormancy, which we report here for the first time in the genus and which could be an adaptation to its mountain habitat.
机译：为了更好地了解半人马座/ ur的稀有特有物种如何适应专门的生态位，我们研究了山泉专家C. somedanum的萌发生态，该物种为多年生限制在该属异常栖息地的多年生物种。我们连续三年对两个种群的新鲜种子进行了实验室实验，以调查：（1）温度和光照对发芽的影响; （2）存在种子休眠; （3）种群间的可生性和年际变化。萌发仅在光照和相对较低的温度（15-22摄氏度）下发生，恒定和交替机制之间没有差异，而在高温（25摄氏度和30摄氏度）下显着降低。我们发现非深层简单形态生理休眠和种子萌发能力的变化取决于种子收集的年份。 C. somedanum在以下方面与该属的常见发芽特性有所不同：（1）在较低温度下发芽，这与湿地物种普遍预期的相反，但可以在春季生境中适应; （2）它的形态生理休眠，这是我们在属中的首次报道，可能与其山地栖息地相适应。

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