Husk Leaves Contribution to Dry Matter and Grain Production as Well as N Distribution in Flint Corn(Zea mays L.)Genotypes Differing in Husk Leaf Area

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Significance of husk leaves, i.e., laminae extending from husks which envelop grains for grain production was analyzed, Hybrid lines of flint corn(Zea mays L.)differing in husk leaf area and one without husk leaves were grown in a field in order to evaluate the contribution of husk leaves to grain production and dry matter production after silking and to the absorption and partitioning of N. Total dry matter production after silking and grain yield were not correlated with husk leaf area in the intact plant. Although total dry matter production after silking and grain yield decreased by the removal of culm leaves, they were not affected by husk leaf removal. When husk leaves alone remained, the dry matter and grain production increased along with the increase in husk leaf area. With a husk leaf area equivalent to about 9.5% of whole plant leaf area, about 42% of whole plant dry matter was produced. The dry matter and grain production per unit husk leaf area was higher than that per unit culm leaf area. These results suggest that husk leaves have a higher potential capacity to produce grain compared to culm leaves. The difference in photosynthetic rates between husk leaves and culm leaves was not significant in all the genotypes. While the photosynthetic rates of husk leaves increased by defoliation of culm leaves, such increase was not observed in culm leaves. Total amount of N in shoot was greater with a higher husk leaf area in intact plant, largely due to the higher N accumulation after silking. When husk leaves alone wrer left, the total amount of N accumulated after silking accouted for as much as 70% or more of that in the intact plant. Although in the intact plant a large fraction of grain N, equivalent to 33 to 38%, was derived by retranslocation from culm leaves and culm plus leaf sheath, respectively, the retranslocation of N was reduced when husk leaves alone remained. These results suggest that husk leaves play a role in the distribution of N during the grain filling period.
社団法人日本土壌肥料学会の論文

Husk Leaves Contribution to Dry Matter and Grain Production as Well as N Distribution in Flint Corn(Zea mays L.)Genotypes Differing in Husk Leaf Area

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