Departamento de Fruticultura Tropical, Instituto Canario de Investigaciones Agrarias (ICIA), La Laguna, Tenerife, Spain.
Plant Biol (Stuttg). 2010 May 1;12(3):469-74. doi: 10.1111/j.1438-8677.2009.00220.x.
Leaf area expansion, thickness and inclination, gas exchange parameters and relative chlorophyll content were analysed in field-grown fig (Ficus carica L.) leaves over time, from emergence until after full leaf expansion (FLE). Ficus carica leaves showed a subtle change in shape during the early stages of development, and FLE was reached within ca. 30 days after emergence. Changes in leaf thickness and inclination after FLE demonstrated good adaptation to environmental conditions during summer in areas with a Mediterranean climate. Changes in gas exchange parameters and relative chlorophyll content showed that F. carica is a delayed-greening species, reaching maximum values 20 days after FLE. Correlation analysis of datasets collected during leaf expansion, confirmed dependence among structural and functional traits in F. carica. Pn was directly correlated with stomatal conductance (Gs), transpiration (E), leaf area (LA) and relative chlorophyll content up to FLE. The effect of pruning on leaf expansion, a cultural technique commonly applied in this fruit tree, was also evaluated. Although leaf development in pruned branches gave a significantly higher relative leaf area growth rate (RGR(l)) and higher LA than non-pruned branches, no significant differences were found in other morphological and physiological traits, indicating no pruning effect on leaf development. All studied morphological and physiological characteristics indicate that F. carica is well adapted to semiarid conditions. The delayed greening strategy of this species is discussed.
在田间生长的无花果（Ficus carica L.）叶片中，随着时间的推移，从叶片出现到完全展开（FLE），对叶面积扩展、厚度和倾斜度、气体交换参数和相对叶绿素含量进行了分析。无花果叶片在发育的早期阶段形状发生微妙变化，大约在出现后 30 天达到 FLE。FLE 后叶片厚度和倾斜度的变化表明，在具有地中海气候的地区，夏季环境条件下具有良好的适应性。气体交换参数和相对叶绿素含量的变化表明，无花果是一种延迟绿色化的物种，在 FLE 后 20 天达到最大值。在叶片扩展过程中收集的数据集的相关分析证实了无花果中结构和功能特征之间的依赖性。在 FLE 之前，Pn 与气孔导度（Gs）、蒸腾（E）、叶面积（LA）和相对叶绿素含量直接相关。评估了在这种果树中常用的修剪对叶片扩展的影响。尽管修剪后的枝条的叶片发育具有明显更高的相对叶面积生长率（RGR(l)）和更高的 LA，但在其他形态和生理特征方面没有发现显著差异，这表明修剪对叶片发育没有影响。所有研究的形态和生理特征表明，无花果适应半干旱条件。讨论了该物种的延迟绿色化策略。
