Partitioning of 14C-Photosynthate in Low and High Nodulating Selections of Chickpea uri icon

abstract

  • Partitioning of "c-photosyn1hate in low and high nodulating selections of chickpea. Genetic variation for nodulation? capacity bas been detected in chickpea cultivars. Five groups of cultivar ICC 5003, were selected based on increasing nodule ,number and mass. These groups were examined to understand carbon budgeting in relation La Nz fixation. Chickpea plants grown at two mineral nitrogen levels were exposed to 14C01 and !.he distributionof 14C-photosynthate in different plant parts was determined. Total plant biomass of chickpea selection increased Significantly (p < 0.01) with increasing mineral N and nodulation level. Mean percentage 14C-pholosynLhatc translocated to the foots decreased with increasing nodulation rank and also with increasing mineral N level. Low nodulating selections of chickpea grown under low soil N level were unable to fulfill their N requirements through biological nitrogen fixation(BNF) as indicated by their higher root shoot ratio compared to UIC high nodulating selections. Such plants invested more carbon in increased root production so as to exploit soil N as evidenced by the greater partitioning of L 4C-photosynlhate La roots in low nodulating selections:

publication date

  • 1995