The phylogenetic relationship of mungbean Vigna radiata (Roxb.) Verde., black gram V. mungo (L.) Hepper and their wild relative V. radiata var. sublobata (Roxb.) Verde. complex was examined on the basis of chemical and physiological properties. Species differences in anthocyanin constituents of hypocotyls and TTC reducing potential of cotyledons were found between mungbean and black gram. Using these characteristics, the wild relative sublobata was shown to be composed of two groups. One group had the same characteristics as mungbean, which was designated “mungbean type”. The other group was called “black gram type”, as it displayed the same characteristics as black gram. These findings confirm that heterogeneous populations of the wild relative, sublobata, could be divided into two taxa so far as the chemotaxonomic characters examined were concerned.

View full abstract

Top-pinching decreased the number of bearing branches per plant. Shading inhibited the growth of branches, especially of lower branches. It seemed that photosynthesis during the growth of branches is more important for growth than photosynthesis before the commencement of growth. Triiodobenzoic acid (TIBA), an antiauxin, promoted the growth of branches on lower nodes, and inhibited the growth of upper node branches. The number of bearing branches per plant was decreased by TIBA. The attempt to promote the growth of branches with an antiauxin, TIBA, appears of doubtful use for castor bean production, at least under weak light conditions.

View full abstract