DO FLOWERS REABSORB NECTAR
DO FLOWERS REABSORB NECTAR
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DOI：
10.2307/2389808
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发表时间：
1991-01-01
影响因子：
5.2
通讯作者：
CORBET, SA
中科院分区：
文献类型：
--
作者：
BURQUEZ, A;CORBET, SA
允许在花中积累的花蜜的固定作物的变化率，此处描述为表观分泌率，可以分解为两个组成部分：总分泌率和表观重吸收率。 一个简单的模型显示了这些成分速率的变化如何影响表观分泌速率。 讨论了各种分泌时间模式的生态和生理相关性，讨论了花蜜碳水化合物是否源自储存组织或直接光合产物。用凤仙花、琉璃苣和贝母进行的实验没有提供重吸收的证据，但在甘蓝型油菜中，表观重吸收是通过表观分泌率和短期内重复采样单朵花得出的累积分泌率之间的差异来揭示的。间隔，并且通过免受昆虫访问的花朵的净溶质损失揭示了真正的吸收。 总分泌率和表观重吸收率均在第 1 天中午达到峰值。此后，分泌几乎停止，但重吸收仍在继续，在第 2 天夜间和中午达到峰值，直到花中不再有花蜜。某些物种会发生重吸收，但另一些物种则不会。 我们认为，花蜜在远离蜜腺的地方积累的花朵（例如萝藦科）或花冠掉落时花蜜流失的花朵（例如不耐烦的花）不会发生这种情况。 简要考虑了重吸收的生态影响。
The rate of change in the standing crop of nectar allowed to accumulate in flowers, described here as the apparent secretion rate, can be resolved into two components: gross secretion rate and apparent reabsorption rate. A simple model shows how changes in these component rates may affect the apparent secretion rate. The ecological and physiological correlates of various temporal patterns of secretion are discussed in relation to whether the nectar carbohydrates originate from storage tissues or from immediate photosynthate.Experiments with Impatiens glandulifera Royle, Borago officinalis L. and Fritillaria imperialis L. gave no evidence for reabsorption, but in Brassica napus L. apparent reabsorption was revealed by a difference between the apparent secretion rate and the cumulative rate of secretion derived by repeated sampling of individual flowers at short intervals, and true absorption was revealed by net solute loss from flowers protected from insect visits. Gross secretion rate and apparent reabsorption rate both peaked at midday on day 1. Thereafter secretion almost stopped, but reabsorption continued, peaking at night and at midday on day 2, until no more nectar remained in the flowers.Reabsorption occurs in some species but not in others. We suggest that it does not occur in flowers in which nectar accumulates at a site remote from the nectary (e.g. Asclepiadaceae), or in those in which the nectar is lost when the corolla falls (e.g. Impatients). The ecological implications of reabsorption are considered briefly.