The content of K and Na in epidermis and mesophyll cells of Puccinellia tenuiflora seedling leaves under Na2CO3 stress Accumulation of Ca in different genotypes of rice grains and its relationship with other seven elements THE DISTRIBUTION OF NA+ AND CL- IN WHEAT LEAF MESOPHYLL CELLS Accumulation of silicon in different genotypes of oat grains and its relationship with other eight elements A Study of Calcium Accumulation and Distribution in the Pericarp of LitchiCultivars Differing in Cracking Resistance A Study of Calcium Accumulation and Distribution in the Pericarp of LitchiCultivars Differing in Cracking Resistance