光照对苦瓜形态可塑性及生物量配置的影响

在人为遮阴条件下，对苦瓜的生长动态、形态特征以及生物量分配进行了研究。结果表明，不同遮阴处理下苦瓜植株的生长有较大的差异，弱光照不利于苦瓜构件数量的增加和生物量的积累；植株在弱光下形成较少的分枝，较薄的叶片以及较细长的主茎和叶柄，表现出较强光生长环境下更强的形态可塑性；植株在生长早期较生长晚期有较大的形态可塑性；生物量对叶片和主茎的分配随光照的减弱而增大，分枝的生物量分配随光照的减弱而降低，光照对分枝茎的生物量分配影响不大；在光资源充足的情况下，外界支持物的缺乏不会对苦瓜的生长造成太大的影响。

Effects of light on morphological plasticity and biomass allocation of Momordica charantia

The growth dynamics, morphological characteristics and biomass allocation of climbing plant Momordica charantia were studied under shading. The results showed that the growth of Momordica charantia had a significant difference under different levels of shading. Under weak light, the plants decreased the chance to increase their modular numbers and accumulate biomass, and had fewer shoots, thinner laminas, longer and thinner petioles, and more slender stems. The plants showed a stronger morphological plasticity under weak light than under strong light, and had a stronger morphological plasticity at early growth stage than at later growth stage. The laminas and stem biomass allocation increased, while branch biomass allocation decreased with decreasing light illumination. Light intensity had little effect on biomass allocation to shoot stems. External support is not necessary for the growth of Momordica charantia under strong light.