Varietal differences of shoot growth characters related to lodging in Tartary buckwhet. Fgopyrum 16

From the view point of Tartary buckwheat breeding, varietal difference of shoot growth characters related to lodging was investigated. Lodging degree (LD) was determined by the angle between the main stem and the ground. When calculated for all strains, the correlation coefficient between the shoot growth character and LD was the highest (negative) and significant for main stem length and main stem diameter showed the second highest (negative) and significant correlation coefficient. Three types of main stem elongation pattern were classified: mid-stem elongation type (main stem internode length increased markedly at the mid-position in-ternodes), uniform elongation type (main stem internode length was almost constant) and the intermediate type. The mid-stem elongation type, usuaully tall and late maturing, was distributed from lowland areas to 3000 m, mainly in relatively low latitude areas, while the uniform elongation type, usally short and early maturing were distributed, in high altitude and middle latitude areas. In the mid-stem elongation type, [branch dry weight/main stem dry weight] and branch dry weight were highly and significantly correlated with LD, showing that the relative size of the branch to the main stem caused variation in LD. The number of main stem nodes were negatively correlated with LD in the uniform elongation type