TRANSPORTATION AND DISTRIBUTION OF 14C-RESERVES ON DIFFERENT GENOTYPE WHEAT VARIETIES AFTER ANTHESIS

Transportation and distribution of 14C-reserves among different stay-green wheat varieties were studied by labelled flag leaf with 14CO2 before anthesis. The results showed that about 80%-90% of 14C-reserves, which assimilated before anthesis, had been kept in the stems and rachises at anthesis, and only 10%-20% remained in the leaves; after anthesis, these reserves were transported to the kernels. At maturity, 14C-reserves in the leaves were almost entirely exported, but about 60%-80% 14C-reserves remained in the stems and rachises, and about 20%-40% was distributed into the kernels. The 14C-reserves in stay-green wheat was transported early from the leaves and stems, and the stay-green wheat YM66 has stored 40% of 14C-reserves in the kernels at mature stages, which was much more than that in the varieties of XY22 and WM6.