Genotypic variation in moisture response of chickpea grown under line-source sprinklers in a semi-arid tropical environment uri icon

abstract

  • The line-source sprinkler technique was used to compare moisture responses of a range of advanced chickpea (Cicer arietinum) breeding lines grown on soil with decreasing soil moisture. Experiments were conducted on a Vertisol soil in peninsular India during the 1985-86 and 1986-87 post-rainy seasons. Lines tested displayed a linear response of both aerial biomass and grain yield to moisture applied. Thus, use of only two moisture levels, with and without irrigation, would be sufficient to compare moisture responses of chickpea in this environment. Genotypic responses were evaluated on the basis of slopes and intercepts of line-source data. Lines previously identified as drought resistant showed greatest resistance in the present study. Most test lines from breeders had relatively low drought resistance, as indicated by low intercept and intermediate to high slope values. This is consistent with the test lines having been selected under different levels of supplementary irrigation in different generations. It is suggested that development of substantially improved drought resistance in this environment will require rigorous selection pressure under a given drought environment. A breeding programme under naturally decreasing soil moisture conditions in this environment is feasible because the pattern of decreasing soil moisture is, or can be made, similar across seasons, thus minimizing environmental variability in relation to genotypic variability

publication date

  • 1994
  • 1994