The ultrastructure of phloem in lateral branches of melons before low night temperature treatments.

<p>(A) Overall structure of phloem in lateral branches, ×2000; (B) The major cells of phloem in lateral branches, ×4000; (C) The developed sieve element (SE), developing sieve element and intermediary cells (IC) of phloem in lateral branches, ×58000; (D) The SE ultrastructure of phloem in lateral branches, ×58000; (E) The chloroplasts (CH) in SE of phloem in lateral branches, ×58000; (F) The sieve pores (SP) in SE of phloem in lateral branches, ×58000; (G) The companion cells (CC) of phloem in lateral branches, ×58000; (H) The phloem parenchyma cells (PP) of phloem in lateral branches, ×58000; (I) The phloem parenchyma cells (PP) becoming to sieve element of phloem in lateral branches, ×36000. SE: sieve tube element; CC: companion cells; IC: intermediary cells; PP: parenchyma cells; CH: chloroplast; N: nucleolus; V: vacuoles; P: plastids; M: mitochondria; RER: rough endoplasmic reticulum; P-protein: protein fiber system; SP: sieve plates.