遮荫处理对绞股蓝叶形态结构及光合特性的影响

Effects of Shading Treatment on the Leaf Morphology, Structure and Photosynthetic Characteristics of Gynostemma pentaphyllum

研究了田间栽培和盆栽绞股蓝(Gynostemmapentaphyllum)在不同程度遮荫处理下的叶形态结构及光合特性的变化。结果表明,两种栽培方式下的绞股蓝叶形态结构及光合特性具有相似的变化规律。具体表现为叶形态结构受光照强度影响较大,与全日照相比,遮荫条件下叶面积增大,叶色深绿,叶片厚度以及栅栏组织和海绵组织厚度小,维管束不发达,表现出阴生叶的特点。同时,遮荫条件下叶片的叶绿素含量和净光合速率高于全日照处理。这些特点表明,绞股蓝属于喜阴植物,遮荫处理有利于其生长发育。

The changes of leaf morphology, structure and photosynthetic characteristics of Gynostemma pentaphyllum under different shading treatment were studied through the experiment in the field and the basin containers. The results revealed that the leaf morphology, structure and photosynthetic characteristics of this plant cultivated in above two ways appeared similarity. The leaf morphology and structure were largely affected by light intensity. Under shading treatments, it presented shade leaf features with large size, dark green, thin thickness of leaf blade, palisade tissue and spongy tissue, and undeveloped vascular bundles compared with those under full sunlight. Meanwhile, the contents of chlorophyll and net photosynthetic rate under shading treatment were higher than those under full sunlight. Available data indicated that G. pentaphyllum is of sciophiles, and shading treatment benefited the growth and development of this plant.