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Inheritance of a New Nonnodulation Gene in Chickpea

Singh, Onkar, Rheenen, H. A. van, Rupela, O. P.
Crop science 1992 v.32 no.1 pp. 41-43
plant breeding, phenotype, root nodules, gene expression, mutants, recessive genes, inheritance (genetics), nodulation, genetic complementation, Cicer arietinum
A study was conducted to investigate the host genetic control of nonnodulation in a new nonnodulating chickpea (Cicer arietinum L.) mutant, ICC 435M, and its relationship with a previously identified mutant, PM 233. The mutant ICC 435M was crossed with its normal nodulating parent and with mutant PM 233. The nodulation of 35-d-old plants of the parents, F₁, F₂, and backcross progenies was examined in a glasshouse to study the inheritance of nonnodulation (Nod-). Experiments indicated that nonnodulation in mutant ICC 435M is inherited as a monogenic recessive trait. Progeny tests of crosses between the two mutants showed that recessive alleles at two different loci are responsible for nonnodulation in mutants ICC 435M and PM 233. The F₁ plants showed normal nodulation, indicating genetic complementation. The gene symbol m6 is proposed to be assigned to the allele controlling the Nod- phenotype in mutant ICC 435M. Journal Article no. 1117