SUNFLECK FREQUENCY AND DURATION AFFECTS GROWTH-RATE OF THE UNDERSTOREY PLANT, ALOCASIA-MACRORRHIZA
SUNFLECK FREQUENCY AND DURATION AFFECTS GROWTH-RATE OF THE UNDERSTOREY PLANT, ALOCASIA-MACRORRHIZA
复制标题
DOI：
10.2307/2390189
复制
发表时间：
1993-12-01
影响因子：
5.2
通讯作者：
PEARCY, RW
中科院分区：
文献类型：
--
作者：
SIMS, DA;PEARCY, RW
1.测定了海芋对日总光子通量密度相同的短光斑(SF)、长光斑(LF)和均匀漫反射光(U)三种光照条件下的气体交换和生长响应。相对生长率(RGR)在U区最高，在LF区最低。低光合作用诱导状态限制了低碳植物的碳增益。光照后CO2固定的贡献更大，导致SF植株的RGR高于LF植株。光合作用能力和太阳斑利用效率不受生长光照条件的影响，说明植物对光照的时间分布没有适应。此外，我们没有发现任何可以归因于适应的碳分配模式的差异。我们的结论是，尽管太阳斑频率和持续时间对大根草的碳吸收和生长有很大的影响，但还没有形成特殊的驯化反应。
1. We measured the gas exchange and growth responses of Alocasia macrorrhiza to three light regimes; short lightflecks (SF), long lightflecks (LF), and uniform diffuse light (U), all with the same total daily photon flux density.2. Relative growth rates (RGR) were highest in the U regime and lowest in the LF regime. Carbon gain was limited by low photosynthetic induction state in the LF plants. A greater contribution from post-illumination CO2 fixation resulted in increased RGR for the SF plants relative to the LF plants.3. Photosynthetic capacities and efficiency of sunfleck utilization were unaffected by growth light regime, indicating that there was no acclimation to the temporal distribution of light. In addition, we did not find any differences in carbon allocation patterns which could be attributed to acclimation.4. We conclude that although sunfleck frequency and duration have substantial effects on carbon gain and growth of A. macrorrhiza, specific acclimation responses have not developed.