Morphology and inheritance of dwarfism in common buckwheat line, G410, andits stability under different growth conditions

The morphological characters of a dwarf common buckwheat line, G410, its dw arf stability under different growth conditions and mode of inheritance wer e investigated. Dwarfism of G410 is the result of reduction in length in th e first four internodes, especially in the second- and the third internodes from the soil. The other internodes and organs were not reduced in size. T herefore, G410 shows the brachysm type dwarfism, which is valuable for both root lodging - and stem lodging resistance. Although buckwheat is sensitiv e to growth conditions and its stem elongates longer under long day or high nitrogen conditions, the morphological characters of G410 were unaffected by seeding date, planting density and nitrogen conditions. F-1 plants of G4 10 crossed with a normal variety, Botan-soba, appeared intermediate and seg regation ratios in the F-2 and BC1F1 generations fitted a single gene model . Therefore, dwarfism of G410 was controlled by a single incompletely domin ant gene, probably which is a new gene because all dwarfing genes reported previously are recessive. Under this inheritance system it is possible to d istinguish genotypes by phenotype and to select dwarf homozygotes. These re sults indicate that G410 is a material worth further investigation for bree ding lodging resistance in common buckwheat.