|Title:||影響碳水化合物自玉米穗軸轉移至子粒因素之研究 - 2.子粒充實期間莖稈與穗軸醣類濃度的變化||Other Titles:||Factors Affecting the Translocation of Carbohydrates from cob to Kernels n Corn. -2. Status of Carbohydrate Concentration in Leaf Sheath, Stem Internode and Cob during Kernel-Filling||Authors:||林淑雰
S. F. Lin
D. J. Liu
|Issue Date:||5-Mar-1990||Publisher:||農業試驗所||Journal Volume:||39||Journal Issue:||1||Start page/Pages:||38-46||Source:||中華農業研究||Abstract:||
Corn hybrids Tainung 351 (TNG 351) and Tainung Yu 365 (TNGY 365) were used as experimental material. The two hybrids have the same maternal inbred but different paternal inbred. The latter hybrid was superior to the former in kernel-filling charac- ters. Field experiment was conducted in the fall crop season of 1986 to study pattern of changes in carbohydrate concentations of leaf sheath and internode at the ear-node and apical and basal portions of the cob. The purpose was to study the relationship between source ability and sink demand of the two hybrids. Experimental results indicated that within 7 weeks after silking, concentrations of total nonstructural carbohydrates (TNC) in the leaf sheath and stem internode were consistently over 20%, suggesting ample source supply. Although sucrose concentration decreased significantly during late kernel-filling, it was not assumed to be the limiting factor of kernel development as the concentrations remained high in the internode and were higher for TNG 351 than for TNGY 365. Cob tissue possessed very high concentrations of glucose and starch shortly after silking, however, the concentrations were low and stable from two weeks after silking, corresponding to the commencement of effective filling period of kernels. Concentrations of cob sucrose and TNC were higher for apical than for basal cob and higher for TNG 351 than for TNG Y 365 during mid and late kernel-filling.These results provided evidences that photosynthates could be translocated to the upper cob and carbbhydrate supply up to the apical cob tissue was not limiting for kernel development of TNG 351 hybrid. This is the second report of a series of papers dealing with the physiological and biochemical factors related to kernel-filling in corn.
|Appears in Collections:||1.台灣農業研究(1950～迄今)|
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