Department of Botany, University of Hawaii at Manoa, 3190 Maile Way, 96822, Honolulu, Hawaii, USA.
Photosynth Res. 1986 Jan;9(3):305-16. doi: 10.1007/BF00029796.
Morphological and physiological measurements on individual leaves of Leucaena leucocephala seedlings were used to study acclimation to neutral shading. The light-saturated photosynthetic rate (Pn max) ranged from 19.6 to 6.5 μmol CO2 m(-2) s(-1) as photosynthetic photon flux density (PPFD) during growth decreased from 27 to 1.6 mol m(-2) s(-1). Stomatal density varied from 144 mm(-2) in plants grown in high PPFD to 84 mm(-2) in plants grown in low PPFD. Average maximal stomatal conductance for H2O was 1.1 in plants grown in high PPFD and 0.3 for plants grown in low PPFD. Plants grown in low PPFD had a greater total chlorophyll content than plants grown in high PPFD (7.2 vs 2.9 mg g(-1) on a unit fresh weight basis, and 4.3 vs 3.7 mg dm(-2) on a unit leaf area basis). Leaf area was largest when plants were grown under the intermediate PPFDs. Leaf density thickness was largest when plants were grown under the largest PPFDs. It is concluded that L. leucocephala shows extensive ability to acclimate to neutral shade, and could be considered a facultative shade plant.
对麻风树幼苗单叶的形态和生理测量用于研究其对中性遮荫的适应。随着生长过程中光合光子通量密度（PPFD）从 27 降低到 1.6 mol m(-2) s(-1)，光饱和光合速率（Pn max）的范围从 19.6 到 6.5 μmol CO2 m(-2) s(-1)。气孔密度从高 PPFD 下生长的植物的 144 mm(-2)变化到低 PPFD 下生长的植物的 84 mm(-2)。高 PPFD 下生长的植物的平均最大 H2O 气孔导度为 1.1，低 PPFD 下生长的植物为 0.3。低 PPFD 下生长的植物的总叶绿素含量高于高 PPFD 下生长的植物（单位鲜重基础上分别为 7.2 和 2.9 mg g(-1)，单位叶面积基础上分别为 4.3 和 3.7 mg dm(-2)）。当植物在中等 PPFD 下生长时，叶面积最大。当植物在最大 PPFD 下生长时，叶密度厚度最大。结论是，麻风树表现出广泛的适应中性遮荫的能力，可被认为是一种兼性遮荫植物。
