PARTITIONING OF CARBON IN SPLIT ROOT SYSTEMS OF BARLEY - EFFECT OF TEMPERATURE OF THE ROOT
PARTITIONING OF CARBON IN SPLIT ROOT SYSTEMS OF BARLEY - EFFECT OF TEMPERATURE OF THE ROOT
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DOI：
10.1093/jxb/45.8.1103
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发表时间：
1994-08-01
影响因子：
6.9
通讯作者：
THORPE, MR
中科院分区：
文献类型：
--
作者：
MINCHIN, PEH;FARRAR, JF;THORPE, MR
在大麦根部温度的阶跃变化过程中，遵循最近固定的光合作用产物分配到大麦根的时间进程。诱导的分配变化的反应时间约为1小时，而标记和未标记二氧化碳的根部呼吸损失的变化要快得多。这些观察表明，虽然温度的突然变化对根的代谢率有直接影响，但影响进口(库容量)的不是代谢率本身。已报道的温度响应与这样的假设相一致，即根中细胞质糖池的大小似乎控制着根的输入，该池直接由韧皮部输入提供，并用作根代谢的底物。
The time-course of partitioning of recently fixed photosynthate to a barley root was followed during a step change in the temperature of the root. The induced change in partitioning had a response time of about 1 h, whilst the change in respiratory loss from the root of labelled and unlabelled CO2 was much faster. These observations suggest that while a sudden temperature change has an immediate effect upon the metabolic rate of the roots it is not the metabolic rate as such which influences import (sink strength). The reported temperature responses are consistent with the supposition that the size of the cytosolic pool of sugar in the root, which is supplied directly by phloem import and used as a substrate for root metabolism, appears to control import into the root.