Comparison of assimilation rates in leaves at various nodes in canopies of three spring wheat cultivars
2001
Takahashi, T. (Yamaguchi Univ., Yamaguchi, 753-8515 (Japan). Faculty of Agriculture)
Assimilation rate and nitrogen content of flag, second, third and lower leaves and an ear of a main stem were measured in three spring wheat cultivars with different plant forms, Haruyutaka, Norin 61 and Selpek. The assimilation rate was evaluated based on the amount of water-soluble carbohydrates accumulated during the daytime (WSC/day). Surface area indexes of the ear and flag leaf in Haruyutaka and Selpek were larger than those in Norin 61. In Haruyutaka and Selpek, the amount of WSC/day was larger in the flag leaf than in the second and third leaf, because the flag leaf had a sufficiently high nitrogen content. On the contrary, in Norin 61, the amount of WSC/day in the flag leaf was similar to that in the second and third leaves during the grain-filling period. The amount of WSC/day in the flag leaf during the last half of the grain-filling period was much higher in Selpek than in Haruyutaka and Norin 61. This may be one of the reasons why Selpek had a heavier total dry weight than Haruyutaka and Norin 61 in 1993 and 1995
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