Growth schedule of Xanthium canadense: Does it optimize the timing of reproduction?
Growth schedule of Xanthium canadense: Does it optimize the timing of reproduction?
复制标题
加拿大苍耳的生长时间表：它是否优化了繁殖时间？
DOI：
10.1007/bf00328403
复制
发表时间：
1991
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：
H. Sugiyama;Tadaki Hirose
研究了营养对短日照一年生植物加拿大苍耳（Xanthium canadense）生殖启动时间的影响，并提出了以下假设：如果植物总是遵循最佳生长时间表，低营养植物将比高营养植物更早启动生殖生长。另一方面，如果植物响应于光周期刺激而开花，则两种植物将在同一天开始生殖生长。沙培实验表明，高营养植物开花早于低营养植物，导致拒绝第一个假设。高营养植物的最佳开花时间比实际开花时间晚2d，低营养植物的最佳开花时间比实际开花时间早10d。这些偏离最佳时间的繁殖产量分别降低了0.1%和2.3%。最终生殖产量与成花时营养体质量的比值在高营养植株中为1.10，在低营养植株中为0.63。由于最佳生长时间表的预期比率为1.0，因此高营养植物比低营养植物更接近最佳生长时间表。苍耳是一种生长迅速的一年生植物，在营养相对丰富的环境中很常见。本研究表明，苍耳通过光周期反应来适应这种环境。
The effects of nutrition on the timing of reproductive initiation of a short-day annual plantXanthium canadense(cocklebur) were examined with the following hypotheses in mind: If the plant always follows an optimal growth schedule, low-nutrient plants will initiate reproductive growth earlier than high-nutrient plants. On the other hand, if the plant flowers in response to photoperiodic stimuli, both plants will initiate reproductive growth on the same day. The sand-culture experiment showed that high-nutrient plants flowered earlier than the low-nutrient plants, leading to rejection of the first hypothesis. The predicted optimal flowering time is 2 days later than the actual flowering time in high-nutrient plants and 10 days earlier in low-nutrient plants. These deviations from the optimal times reduced the reproductive yield by 0.1% and 2.3%, respectively. The ratio of the final reproductive yield to the vegetative mass at flower initiation was 1.10 in high-nutrient plants and 0.63 in low-nutrient plants. Since the expected ratio for the optimal growth schedule is 1.0, high-nutrient plants followed the opitmal growth schedule more closely than the low-nutrient plants. Cocklebur is a fast-growing annual which is common in relatively nutrient-rich environments. This study suggests that cocklebur adapts itself to such environments through its photoperiodic response.