Effects of shift in flowering time on the reproductive output of Xanthium canadense in a seasonal environment
Effects of shift in flowering time on the reproductive output of Xanthium canadense in a seasonal environment
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季节性环境下开花时间的变化对加拿大苍耳繁殖产量的影响
DOI：
10.1007/pl00008818
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发表时间：
1998
期刊：
影响因子：
2.7
通讯作者：
Tadaki Hirose
中科院分区：
文献类型：
--
作者：
Y. Shitaka;Tadaki Hirose
研究了短日照一年生植物加拿大苍耳（Xanthiumcanadense）开花期的变化对繁殖产量的影响。通过光周期调控，使开花期比自然开花期提前或推迟1个月。自然开花期的植株生殖产量最高。早花1个月和晚花1个月的植株，其生殖产量分别下降42%和23%。生殖输出是指生殖期生物量生产及其在生殖器官中的分配。虽然延迟开花增加了生物量生产，它减少了其分配到生殖器官的比例。自然开花植物的最高繁殖输出是由于开花的这两种效应之间的折衷。开花早的植株向生殖器官的转运率高，植株衰老快。晚开花减少了生物量转运到生殖器官，从而延长了生殖期。这些实验结果进行了讨论的繁殖成本和开花的最佳时间，最大限度地提高最终的生殖输出。结果表明，自然开花时间使繁殖产量最大化，而繁殖成本最小化。
We studied the effects of a change in flowering date on the reproductive output of a short-day annual plant,Xanthium canadense. The flowering date was changed by photoperiodic manipulation to 1 month earlier or later than the natural flowering date. Plants with the natural flowering date attained the highest reproductive output. For those flowering 1 month earlier or later, the reproductive output was decreased by 42% or 23%, respectively. The reproductive output was analyzed as the product of the biomass production during the reproductive period and its allocation to the reproductive organs. Although delay in flowering increased biomass production, it decreased its fractional allocation to the reproductive organs. The highest reproductive output in the natural flowering plants resulted from a compromise between these two effects of flowering. Plants flowering earlier had higher translocation rates to the reproductive organs and accelerated plant senescence. Later flowering caused a reduction in biomass translocation to the reproductive organs and thus extended the reproductive period. These experimental results are discussed in relation to the cost of reproduction and the optimal time for flowering that maximizes the final reproductive output. It is suggested that the natural flowering time maximized the reproductive output while minimizing the cost of reproduction.