THE CONTROL OF VESSEL SIZE AND DENSITY ALONG THE PLANT AXIS - A NEW HYPOTHESIS
THE CONTROL OF VESSEL SIZE AND DENSITY ALONG THE PLANT AXIS - A NEW HYPOTHESIS
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DOI：
10.1111/j.1432-0436.1983.tb01320.x
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发表时间：
1983-01-01
期刊：
影响因子：
2.9
通讯作者：
ZIMMERMANN, MH
中科院分区：
文献类型：
--
作者：
ALONI, R;ZIMMERMANN, MH
提出了一种假设，认为从叶片到根的导管尺寸增大和导管密度减小是由于从叶片到根的生长素浓度递减的梯度。在去头豆茎上施用羊毛脂膏中的生长素，会产生导管数量减少、导管大小增加的明显基向梯度。在应用点的高生长素浓度导致许多血管保持小，因为它们的快速分化。生长素浓度进一步降低，导致分化缓慢，血管变少变大。
A hypothesis is presented which ascribes the general increase in vessel size and decrease in vessel density from leaves to roots to a gradient of decreasing auxin concentration from leaves to roots. Application of auxin in a lanolin paste to decapitated bean stems produced a sharp basipetal gradient of decreasing vessel number and increasing vessel size. The high auxin concentration at the point of application resulted in numerous vessels that remained small because of their rapid differentiation. The low auxin concentration further down resulted in slow differentiation and therefore fewer and larger vessels.