The mesophyll mainly consists of palisade tissue.

叶肉主要为栅栏组织。

Aerenchyma is well developed in mesophyll.

叶肉中通气组织发达,且均有不规则裂生性气腔.

There is no differentiation among mesophyll cells (no differentiation of palisade tissue and spongy tissue).

叶肉细胞同型，无栅栏细胞和海绵组织的分化；

However under severe water stress, the principal cause of the reduction in photosynthesis was attributed to the decline of photosynthetic capacity of mesophyll cells.

而严重水分胁迫下，叶肉细胞光合能力的降低是光合速率下降的主要原因。