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Differentiation and Ultrastructure of the Protophloem Sieve Elements of Minor Veins in the Maize Leaves: Changes in the Protoplast Cytological Studies on the Development of Sieve Element and Floral Nectary Tissue in Arabidopsis thaliana Spectrin-like Protein in the Phloem of Cucumis sativus Ultrastructure of Sieve Elements in Secondary Phloem of Dalbegia odorifera During Leaf-Bearing and Leaf-Absent Period The development of the radicle and the study of the sieve element of the seedling of Nelumbo nucifera Development of the vascular bundle and transfer cells in cotyledon of lotus COMPARATIVE STUDIES ON SECONDARY PHLOEM OF 7 SPECIES IN SALICACEAE