DIURNAL PATTERN OF TRANSLOCATION AND CARBOHYDRATE-METABOLISM IN SOURCE LEAVES OF BETA-VULGARIS L
DIURNAL PATTERN OF TRANSLOCATION AND CARBOHYDRATE-METABOLISM IN SOURCE LEAVES OF BETA-VULGARIS L
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DOI：
10.1104/pp.70.3.671
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发表时间：
1982-01-01
期刊：
影响因子：
7.4
通讯作者：
GEIGER, DR
中科院分区：
文献类型：
--
作者：
FONDY, BR;GEIGER, DR
研究了糖代谢和转运速率的变化，为甜菜源叶控制出口提供证据。在连续两个14小时的光照周期内进行稳态标记，并在两个24小时周期内测量与易位相关的各种数量。光照后淀粉积累延迟。在光照期结束时，淀粉停止积累，而光合速率和蔗糖水平保持不变。在黑暗期开始时，淀粉的动员有75分钟的延迟。夜间对发育中的汇叶的进口速率与白天相似，而出口速率在夜间明显下降。淀粉的积累和降解似乎是对光照水平的响应。光期结束前淀粉积累的停止是由内源引起的。外属控制似乎是由源叶中的蔗糖水平介导的，而内源控制似乎是由光周期或光合持续时间介导的。
Transitions in carbohydrate metabolism and translocation rate were studied for evidence of control of export by the sugar beet (B. vulgaris L. Klein E.) source leaf. Steady-state labeling was carried out for 2 consecutive 14-h light periods and various quantities related to translocation were measured throughout two 24-h periods. Starch accumulation following illumination was delayed. Near the end of the light period, starch stopped accumulating, whereas photosynthesis rate and sucrose level remained unchanged. At the beginning of the dark period there was a 75-min delay before starch was mobilized. The rate of import to the developing sink leaves at night was similar to that during the day, whereas export decreased considerably at night. Starch accumulation and degradation seemed to be initiated in response to the level of illumination. Cessation of starch accumulation before the end of the light period was initiated endogenously. Exogenus control appeared to be mediated by the level of sucrose in the source leaf while endogenous control seemed to be keyed to photoperiod or photosynthetic duration.