离子在根中的径向运输。
Radial transport of ions in roots.
作者信息
Yu G H, Kramer P J
机构信息
Duke University, Durham, North Carolina.
出版信息
Plant Physiol. 1969 Aug;44(8):1095-100. doi: 10.1104/pp.44.8.1095.
Measurements were made of the relative amounts of (86)Rb, (36)Cl, and (32)P accumulated in the cortex and stele of intact roots of corn (Zea mays), either detached or attached to their shoots. Both 4- and 7-day-old roots accumulated as much or more (86)Rb in the stele as in the cortex. In experiments with (36)Cl, cortex and stele accumulated the same amount, except for 4-day-old and 7-day-old attached roots, in which the cortex contained more (36)Cl than the stele after 23 hr. An additional study of (32)P uptake showed greater accumulation in the cortex than the stele for a short period of time, but as much in the stele as in the cortex after 8 to 24 hr. Transport of (86)Rb, (36)Cl, and (32)P into the xylem exudate increased with increasing accumulation of these ions in stele and cortex of the root. These experiments show no consistent difference between cortex and stele of intact corn roots with respect to their ability to accumulate several kinds of ions.
对玉米（Zea mays）完整根系（无论是否与地上部分相连）的皮层和中柱中积累的（86）铷、（36）氯和（32）磷的相对量进行了测量。4日龄和7日龄的根系在中柱中积累的（86）铷与皮层中一样多或更多。在用（36）氯进行的实验中，皮层和中柱积累的量相同，但4日龄和7日龄与地上部分相连的根系除外，在23小时后，这些根系的皮层中（36）氯的含量比中柱多。一项关于（32）磷吸收的额外研究表明，在短时间内，皮层中的积累量比中柱多，但在8至24小时后，中柱中的积累量与皮层中的一样多。随着这些离子在根的中柱和皮层中积累量的增加，（86）铷、（36）氯和（32）磷向木质部渗出液中的运输也增加。这些实验表明，完整玉米根的皮层和中柱在积累几种离子的能力方面没有一致的差异。
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