Hybrid necrosis and hybrid chlorosis in Indian varieties of Triticum dicoccum Schubl.

Summary Forty-four varieties of Triticum dicoccum ex India were crossed to two T. aestivum testers, namely, C 306 (Ne₁ne₂ch₁Ch₂) and Sonalika (ne₁Ne₂ch₁Ch₂), to determine their necrosis and chlorosis genes. Thirty-six (81%) varieties were found to be carriers of the Ch₁gene; the genotype of their necrosis gene (Ne₁or ne₁) could not be determined for want of suitable testers with the authors. Six varieties were found to be noncarriers for necrosis and chlorosis genes and two varieties were found to be carriers of the Ne₁gene and non-carriers for the chlorosis gene. Allelic variation at the Ch₂locus was observed; two alleles, Ch₂^s and Ch₂^m, are suggested.