M. Minami et al., Morphology and inheritance of dwarfism in common buckwheat line, G410, andits stability under different growth conditions, BREED SCI, 49(1), 1999, pp. 27-32
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.