@article{icrisat5065,
           title = {Evaluation of groundnut genotypes for heat tolerance under field conditions in a Sahelian environment using a simple physiological model for yield},
       publisher = {Cambridge University Press},
          author = {B R Ntare and J H Williams and D Fatondji},
           pages = {81--88},
            year = {2001},
          volume = {136},
         journal = {Journal of Agricultural Science},
          number = {1},
             url = {http://oar.icrisat.org/5065/},
        abstract = {Heat tolerance of groundnut (Arachis hypogaea L.) was evaluated under field conditions using physiological traits identified in a yield model [crop growth rate (C), reproductive duration (Dr) and partitioning (p)]. In 1991, 625 diverse genotypes were initially screened under irrigation during the hottest months (February to May). Subsequent tests consisted of 16 contrasting genotypes selected based on a combination of high pod yield and partitioning coefficient of {\ensuremath{>}}0? 50. Large variation was observed among the 625 genotypes for pod yield and physiological traits. C was a powerful factor influencing pod yield. Eight genotypes combining high pod yield and a partitioning coefficient greater than 0?6 were identified. These included two released cultivars (55?437 and 796) in the Sahel. Correlations between seasons were significant for p (r=0?84), but non-significant for pod yield (r=0?40), C (r=0?39), and Dr (0?36). Date of sowing and genotypes had significant effects on pod yield and C, but were slight on p and Dr. Pod yield of most genotypes declined by more than 50\% when flowering and pod formation occurred when maximum temperatures averaged 40?C. The results revealed that estimates of p would be a more reliable selection criterion for identification of genotypes tolerant to heat than yield. Further research is suggested to maximize crop growth rate and partitioning of genotypes growing under supra-optimal temperatures.

}
}