Genotype-by-environment interaction effect on yield and its physiological bases in short-duration pigeonpea

Chauhan, Y.S. and Wallace, D.H. and Johansen, C. and Singh, Laxman (1998) Genotype-by-environment interaction effect on yield and its physiological bases in short-duration pigeonpea. Field Crops Research, 59 (2). pp. 141-150.

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Thirty short-duration pigeonpea (Cajanus cajan) genotypes were compared for seed yield in 20 environments representing major areas of cultivation (Patancheru (17°N and 72°E), Gwalior (26°N and 78°E) and Hisar (29°N and 75°E)), soil types and sowing times. Seed yield across environments varied widely from 0.36 to 2.09 t ha-1. Average yield was highest, 1.53 t ha-1, for hybrid ICPH 8. The genotype-by-environment interaction (GEI) effect was highly significant and was three times more important than the genotype effects. Line ICPL 83006 was highest yielding in one, ICPL 87101 in two, hybrids ICPH 9 in four and ICPH 8 in 13 environments. Based on the range of adaptation of the highest yielding lines, the 20 environments were grouped into four fairly homogeneous crop growing environments in which the same genotypes performed best (mega-environments). The average yield with the highest-yielding lines grown in the respective mega-environment was 12.5% higher than when ICPH 8 was grown across all the environments. Significant correlations of crop growth rate, duration of reproductive phase, partitioning and growth habits of lines with GEI patterns suggest that variable performance of the lines across the 20 environments could be due to variation in the physiological components of yield. It is suggested that the presence of significant GEI and that its systematic exploitation through selection of the appropriate physiological components for each mega-environment can result in higher average yield across growing environments

Item Type: Article
Author Affiliation: International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) Patancheru, 502 324, Andhra Pradesh, India
Subjects: Plant Production
Crop Improvement > Genetics/Genomics
Divisions: Pigeonpea
Depositing User: Mr B Krishnamurthy
Date Deposited: 14 Jun 2011 05:13
Last Modified: 14 Jun 2011 05:13
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