Nature and inheritance of self-incompatibility in Capsicum pubescens and C. cardenasii
AuthorsChawdhry Muhammad Yaqub
Paul G. Smith
Authors AffiliationsChawdhry Muhammad Yaqub was Senior Lecturer, Department of Horticulture, West Pakistan Agricultural University, Lyallpur, West Pakistan; Paul G. Smith was Professor of Vegetable Crops and Olericulturist in the Experiment Station, Davis.
Hilgardia 40(12):459-470. DOI:10.3733/hilg.v40n12p459. January 1971.
The genetic basis of self-incompatibilitiy in Capsicum pubescens and C. cardenasii was studied. Self-incompatibility was discovered for the first time in the normally self-compatible, cultivated species C. pubescens. All strains of C. cardenasii studied were self-incompatible.
Diallel matings of F1 plants from intraspecific (Capsicum cardenasii) and interspecific (C. pubescens × C. cardenasii) crosses indicated a gametophytic system of incompatibility of the Nicotiana type in both species. Each F1 progeny, regardless of the direction of the cross, constituted four intrasterile, interfertile groups. When self-incompatible C. pubescens or C. cardenasii plants were crossed with self-compatible C. pubescens, all F1 and F2 plants were self-compatible. F1 plants accepted pollen readily from either parent. In contrast to Nicotiana, however, the self-incompatible strains accepted pollen readily from self-compatible plants.
The number of pollen-grain nuclei and the site of inhibition of pollen-tube growth substantiated the gametophytic interpretation of incompatibility in Capsicum.
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