Export, Mobilization, and Respiration of Assimilates in Uniculm Barley during Light and Darkness |
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Authors: | GORDON A J; RYLE G J A; POWELL C E; MITCHELL D |
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Abstract: | The respiratory losses and the pattern of carbon supply froma leaf of unicuim barley were examined during a complete diurnalperiod using a steady state 14C-labelling technique. After a delay of c. 1 h a portion of the 14C exported from acontinuously assimilating leaf was lost in respiration in thelight. This respiratory loss amounted to c. 20% of the total14C fixed. A further 28% of the total 14C fixed was respiredduring the dark period. In the light, carbon was fixed at a rate of c. 8·9 mgC dm2 h1 and exported from the leaf at c. 5·3mg C dm2 h1. Dark export averaged c. 31% of theday-time rate. Carbohydrate was stored in the leaf during the day and was almostcompletely remobilized during the dark. Sucrose, the major reservecarbohydrate, was exported first whilst the starch level remainedconstant. After some 9 h of darkness, sucrose declined to alow level and starch remobilization began. |
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