Effect of benzyl-amino purine and girdling site on photosynthesis, translocation and nitrogen fdcation in Y-shaped mungbean

Effect of girdling site and BAP (6-benzyl amino purine) application on photosynthesis, translocation and nitrogen fixation was studied in Y-shaped mungbean plants. BAP application delayed leaf senescence and enhanced photosynthetic rate in both treated and untreated branch. Girdling reduced photosynthetic rate, translocation and nitrogen fixation drastically. When phloem was removed from the main stem and BAP applied branch, 98% of ¹⁴C was found in the applied branch only but when opposite branch was girdled, the translocation of photosynthates was diverted to main stem and roots (8.1 and 6.4% respectively). Roots and main stem act as alternate sink and in the intact plant, the remote effect of BAP was noticed in the opposite branch through roots only.