University of Pretoria, Pretoria, Republic of South Africa.
Planta. 1979 Jan;145(2):167-73. doi: 10.1007/BF00388713.
Severance of the stele of young main roots of pea (Pisum sativum L.) results in formation of a bridge of vascular tissue in the remaining cortex. Cell divisions occur close to the severed vascular tissues on both the proximal and distal sides of the cut within 24 h. Differentiation of new vascular strands subsequently begins in the same locations and progresses from both sides of the wound into the remaining cortex and also back along the original vascular strands. Most of the vascular tissue which forms the bridge through the cortex differentiates in the acropetal direction. Continuous strands composed of single sieve elements bypass the wound somewhat sooner than the first complete xylem strands; the latter in 60-70% of the cases, are present by 3 d. Cambial activity subsequently adds more xylem and phloem. Vascular regeneration is not affected by removal of the epicotyl or the root tip; it is greatly reduced but not prevented by removal of the cotyledons.
豌豆幼主根柱的切断会导致剩余皮层中维管束桥的形成。在切断后 24 小时内，在切口的近端和远端靠近被切断的维管束处会发生细胞分裂。随后，新的维管束在相同位置开始分化，并从伤口两侧向剩余皮层推进，也沿着原始维管束向后推进。形成穿过皮层的桥的大部分维管束向近轴方向分化。由单个筛管组成的连续束比第一个完整的木质部束更早地绕过伤口；在后一种情况下，60-70%的情况在 3 天内出现。随后，形成层活动增加了更多的木质部和韧皮部。维管再生不受去除上胚轴或根尖的影响；去除子叶会大大减少但不会阻止维管再生。
