Identification and evaluation of chickpea germplasm for tolerance to heat stress uri icon

abstract

  • Global warming and extreme temperatures arepredicted in the future, hence identifi cation ofappropriate varieties that could adapt to suchchanges is imperative for sustaining crop productivity.Thirty-fi ve early maturing chickpea(Cicer arietinum L.) germplasm accessions wereevaluated for their tolerance to heat stress.Plant traits such as plant width, fl owering duration,days to maturity, pod number, seed weight,grain yield and per-day productivity wereaffected under heat stress. Genotypes differedin their sensitivity to heat stress, and the yieldloss among genotypes varied from 10 to 15%of potential yield for every degree increase intemperature beyond the optimum temperaturerange. Multiple regression analysis indicatedthat the plant trait expression can be predictedaccurately for the assumed change in climateon the basis of mean temperature, daylength,duration of bright sunshine, incident solar radiation,relative humidity, wind velocity, and potentialevaporation. Mitigation of heat stress byirrigation and application of additional nitrogento the crop resulted in sustaining the potentialyield (up to 80%). ICC 14346 showed high toleranceto heat stress and could be used as aparent in crop improvement research. ICC 5597,ICC 5829, ICC 6121, ICC 7410, ICC 11916, ICC13124, ICC 14284, ICC 14368, and ICC 14653were heat stress tolerant, responsive to irrigationand nitrogen management, and consistentlyhigh yielding (>1400 kg ha?1) compared with thecontrol ICCV 92944 (1333 kg ha?1)

publication date

  • 2011
  • 2011