1Division of Genetics, Indian Agricultural Research Institute, New Delhi, 110012.
Nuclear Research Laboratory, Indian Agricultural Research Institute, New Delhi-110012
In immature wheat seeds, more accumulation of water in the large seeded type leads to greater enlargement of seed coat, increase in grain weight and volume and decrease in density as compared to small seeded genotypes. More sugar per se as the cause for higher accumulation of water in immature wheat seed does not seem to be true. The changes associated with the enlargement of seed coat are also reflected in the peduncle as increase in mean diameter and number of vascular bundles per unit area, area covered by vascular bundles per unit area of the peduncle transverse section and increase in peduncle wall thickness. Thus, both the enlargement of grain-sink and the transport mechanism appear to be closely linked genetic traits and should be simultaneously considered for improvement.
