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Inheritance of Ineffective Nodulation in Cowpea

Texas Agric. Exp. Stn., Overton, TX 75684

J. C. Miller, Jr.

Dep. of Horticultural Sciences, Texas A&M Univ., College Station, TX 77843

^* Corresponding author.

Nodulation is a critical step in the development of the legume-Rhizobium symbosis. A cowpea [Vigna unguiculata (L.) Walp.] plant of the varietal mix ‘Iron & Clay’ with small, white, ineffective nodules was observed during a greenhouse experiment and designated IC-l. Experiments were conducted to determine the genetic control of ineffective nodulation in cowpea. The IC-1 S₁ plants were ineffectively nodulated and no nitrogenase activity was detected by acetylene-reduction assay. No segregation for symbiotic effectiveness was noted in the S₂ and S₃ generations of IC-1. Crosses were made between IC-1 S₁ and normal, effectively nodulating Iron & Clay cowpea, resulting in four F₂ families that segregated into effective and ineffective nodulation classes. Based on x₂ analysis, ineffective nodulation in cowpea is determined by a simply inherited recessive gene, designated cpi. The interaction of cpi and eight cowpea Bradyrhizobium strains was investigated, and no strain effects were noted. Non-strain-specific ineffective nodulation of cowpea is conditioned by a single recessive gene pair (cpi cpi).

Received for publication June 5, 1990.