贺兰山丁香的有性生殖对策——果实
首发时间:2009-05-22
摘要:本文对1428颗贺兰山丁香果实及其所含种子数的统计分析结果显示:被虫吃或发霉的种子比较少,分别占1.19%和1.05%,其次是含4粒种子的果实(3.57%)、0粒(3.99%)、3粒(9.38%)、2粒(25.77%),含1粒种子的果实最多,为55.04%,这表明贺兰山丁香果实趋向于产生一粒种子;对贺兰山丁香果实性状与果实所含种子数的方差分析结果显示,果实长、宽、重及果皮重因果实所含种子数不同而存在显著差异,其中,含一粒种子的果实在果长、果宽、果重、果皮重上都是最小、最轻的,即贺兰山丁香果实的性状表现出逐渐变小的发育趋势。综合以上分析,可以得出贺兰山丁香的有性生殖对策表现为:为了减少在果皮上的无效消耗,果实的发育趋于变小;为了确保有性繁殖顺利完成,则选择了以减少种子的数量来保证种子的质量。
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The reproductive strategy of Syringa pinnatifolia var. alanshanica – based on its capsules
Abstract:1428 capsules of Syringa pinnatifolia var. alanshanica were studied in this paper. The results showed that capsules with one seed occupied the biggest percentage in number , account for 55.04%. The ratio of seed ate by insect or moldy seed was low, which was 1.19% and 1.05% respectively and followed in decreasing by capsules with 4 seeds, 0 seed, 3 seeds and 2 seeds. There was significant difference between capsule characters (capsule length, capsule width, capsule weight and peel weight) and seed number. Capsules with one seed were the smallest one in size and the lightest one in weight. The results showed that there was a downward developing trend in capsule size. The reproductive strategy of Syringa pinnatifolia var. alanshanica might be that the capsule should become smaller in order to reduce the ineffective consumption on the peel and the number of seed in each capsule should become more scarce for the sake of the sexual reproduction completed successfully.
Keywords: Syringa pinnatifolia var. alanshanica capsule seed reproductive strategy
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