THE EFFECTS OF AUXINS AND KINETIN ON XYLEM DIFFERENTIATION IN THE PEA EPICOTYL
THE EFFECTS OF AUXINS AND KINETIN ON XYLEM DIFFERENTIATION IN THE PEA EPICOTYL
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生长素和激动素对豌豆上胚轴木质部分化的影响
DOI：
10.1002/j.1537-2197.1962.tb14963.x
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发表时间：
1962
期刊：
影响因子：
--
通讯作者：
K. Thimann
中科院分区：
文献类型：
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作者：
H. Sorokin;S. N. Mathur;K. Thimann
愈伤组织的生长导致在节间的根部形成一种特有的裂开。单独或与生长素联合使用激动素可显著改变上述结构。它导致在节间核心的整个圆周上形成更活跃的形成层，形成几层次生木质部；形成层主要由具有凹陷壁的长导管组成。完全没有增生性生长，木质部不闭塞。因此，激动素的作用是使木质部更正常，并将上胚轴结构从草本改变为或多或少的木质。本研究旨在研究生长素和激动素在抑制豌豆侧芽发育过程中对茎和芽运输系统发育的影响。然而，随着工作的发展，很明显，节间的变化比预期的要广泛得多，在解释其他部分的变化之前，需要进行详细的研究。因此，本文描述了在用2，4-二氯苯氧乙酸或吲哚乙酸处理，2加激动素和不加激动素后，以及在2，4-D溶液中在完整的根上生长断头植物后，在切除的、黄化的豌豆上胚轴的一些组织学变化。这里的注意力集中在节间，节间和芽的变化将在另一篇文章中给出描述。有许多关于茎的解剖与生长素治疗有关的早期研究，
growth of this callus causes a characteristic split at the base of the internode. Treatment with kinetin, alone or in combination with the auxin, changes the above structure markedly. It leads to the initiation, over the entire circumference of the core of the internode, of a still more active cambium, which forms several layers of secondary xylem; this consists mainly of long vessel members with pitted walls. Hyperplastic growth is completely absent, and the xylem does not become occluded. Thus the effect of kinetin is to make the xylem more normal and to alter the epicotyl structure from herbaceous to more-or-less woody. THE INITIAL purpose of this investigation was to study the effects of auxins and kinetin on the development of the transport system in the stem and bud of the pea plant during the inhibition of lateral bud development. As the work developed, however, it became clear that the changes in the internode are much more extensive than had been expected, and that they required detailed study before changes in the other parts could be interpreted. This paper, therefore, describes some of the histological changes which occur in excised, etiolated sections of the Pisum epicotyl after treatment with 2,4-dichlorophenoxyacetic acid or indoleacetic acid,2 with and without kinetin, and also after growing decapitated plants on intact roots in 2, 4-D solutions. Attention is devoted here to the internode, and a description of the changes in the node and bud will be given in another paper. There are many earlier studies of the anatomy of stems in relation to treatment with auxins,