Flowering Phenology and Seed Set in Claytonia virginica (Portulacaceae)
Flowering Phenology and Seed Set in Claytonia virginica (Portulacaceae)
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Claytonia virginica（马齿苋科）的开花物候和结籽
DOI：
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发表时间：
1977
期刊：
影响因子：
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通讯作者：
D. Schemske
中科院分区：
文献类型：
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作者：
D. Schemske
图尔斯克，D.W.(部门乙二醇乙醇酯。和Evol.，Vivarum Bldg，Univ.伊利诺伊州，IL 61820)。标题马齿苋的开花物候和结实情况。胡说八道。托里·博特。俱乐部104：254-263。1977年-在伊利诺伊州中部的布朗菲尔德和哈特森林获得了维吉尼亚克雷托尼亚的种子结实和开花生理数据。在这两个地点，开花时间在不同年份之间差异很大，温度是最接近的线索。布朗菲尔德和哈特的子房平均结实率在1974年最高，1975年最低，1976年居中。根据1975年和1976年在棕地标记的花序上的花的顶端确定，在25%和50%的累积开花点之间，第一雌花的结实率最高。在这两年中，开花早、晚的物候序列降低了种子产量，结实率在盛花后期迅速下降。最大结实率与1975年双峰型开花序列中两个高峰中的第一个一致，但早于1976年开花高峰期。Claytonia开花末期，冠层发育造成的光照减弱最严重时，开花先雌花的败育率最高。Claytonia开花时间的演变受到以下因素的影响：1)季节早些时候的寒冷温度使授粉几率降低；2)季节后期的羽冠发育降低了光合作用能力。
SCHEMSKE, D. W. (Dept. Ecol., Ethol. and Evol., Vivarium Bldg., Univ. Ill., IL 61820). Flowering phenology and seed set in Claytonia virginica (Portulacaceae). Bull. Torrey Bot. Club 104: 254-263. 1977.-Data oll seed set anid floweriiig pheiiology were obtained for Claytonia virginica L. in Brownfield and Hart Woods in central Illinois. At both sites flowering time varied markedly between years with temperature as the proximate cue. Mean seed set per ovary at Brownfield and Hart was greatest in 1974, lowest in 1975 and intermediate in 1976. As determined from ceinsuses of flowers on marked inflorescences at Brownfield in 1975 and 1976, seed set was highest in flowers first-pistillate betweeln the 25 and 50% cumulative flowering poiints. In both years, flowers opening early and late in the phenological sequence had reduced seed production and seed set declined rapidly during the latter periods of heavy flowering. Maximum seed set coincided with the first of the two peaks in the bimodal 1975 flowering sequence but preceded peak flowering in 1976. Abortion rates were highest in flowers first-pistillate during the final periods of Claytonia flowering when reduction of light due to canopy development was most severe. The evolution of Claytonia flowering time has been influenced by 1) cold temperatures early in the season which milnimize pollination probabilities and 2) developmenit of the cainopy late in the season which reduces photosynthetic capabilities.