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Nodulation Mutants in Chickpea¹

As a first step toward future studies of symbiotic N₂ fixation in chickpea (Cicer arietinum L.), genotypes exhibiting aberrant responses to inoculation with Rhizobium strain CC1192 were isolated by selection following ,-irradiation mutagenesis of chickpea line P502. In greenhouse experiments, 28 of 968 M₂ families contained one or more plants which showed stunted, chlorotic growth after 30 to 35 days under N₂-dependent conditions but which resumed vigorous growth with the addition of 8 mM NH₄NO₅. Of 24 selections advanced to the M₄ generation, two lines, PM233 and PM665, rep:roducibly failed to form root nodules under various conditions where the parental control P502 was well nodulated. PM233 and PM665 grew vigorously with 8 mM NH₄NO₅, but PM665 could be distinguished from the wild type by lighter green leaves and slightly crinkled pods. Six other lines exhibited aberrant responses to inoculation in replicated M₄-generation testing, but have not yet been satisfactorily characterized.

Key Words: Cicer arietinum L. • Garbanzo • Nitrogen fixation • Induced mutation

² Graduate research assistant, assistant professor, and professor, respectively; Dep. of Agronomy and Range Science, Univ. of California, Davis, CA 95616.

Received for publication December 27, 1983.