Burung Indonesia, Jl. Dadali No. 32, PO Box 310/Boo, Bogor 16161, Indonesia.
Department of Biology, University of Andalas, Limau Manis, Padang 25163, Indonesia.
Tree Physiol. 2018 May 1;38(5):696-705. doi: 10.1093/treephys/tpx149.
Recent studies have suggested that an association between size and speed of stomatal opening of stomata within taxa is likely to play a role in photosynthesis and transpiration. In this study we investigate whether this correlation applies for seedlings of 11 rainforest species from different taxa, and whether differences in stomatal and gas exchange parameters were related to initial growth under field and controlled conditions. The experiment was conducted on seedlings of nine late successional species and two early successional species, placed in full sunlight or 70% shade. We assessed density, size, length and width of guard cells, coupled with gas exchange parameters in the transition from darkness to light, recording minimum stomatal conductance during daytime darkness (gs-dark), operating maximum stomatal conductance (gs-op), speed of stomatal opening and the time to reach 50% conductance (T-50%). All stomata and gas exchange parameters were different between species. Shade significantly affected size and density, and all gas exchange parameters except gs-op were different between light situations. Stomatal size correlated negatively with speed of opening and positively with T-50%, confirming that smaller stomata open faster than large stomata. The two early successional species were very different in stomatal size and density, and in response to light. Anatomic parameters and physiological traits were not related to height growth, but gs-dark, gs-op and speed of stomatal opening were associated with biomass growth in a subselection of six late successional species.
最近的研究表明，同一分类群内的气孔大小与气孔开启速度之间的关系可能在光合作用和蒸腾作用中起作用。在这项研究中，我们调查了这种相关性是否适用于来自不同分类群的 11 种热带雨林物种的幼苗，以及气孔和气体交换参数的差异是否与野外和受控条件下的初始生长有关。该实验在 9 个晚生种和 2 个早生种的幼苗上进行，置于全光照或 70%遮荫下。我们评估了从黑暗到光照过渡期间的密度、大小、长度和宽度的保卫细胞，以及气体交换参数，记录白天黑暗时的最小气孔导度（gs-dark）、最大操作导度（gs-op）、气孔开启速度和达到 50%导度的时间（T-50%）。所有的气孔和气体交换参数在种间都有差异。遮荫显著影响大小和密度，除了 gs-op 之外，所有的气体交换参数在光照条件下都有差异。气孔大小与开启速度呈负相关，与 T-50%呈正相关，这证实了较小的气孔比大的气孔开启得更快。两个早生种在气孔大小和密度以及对光的反应上有很大的不同。解剖参数和生理特征与高度生长无关，但 gs-dark、gs-op 和气孔开启速度与 6 个晚生种的亚选择中生物量生长有关。
