Hilgardia
Hilgardia
Hilgardia
University of California
Hilgardia

Nature and inheritance of self-incompatibility in Capsicum pubescens and C. cardenasii

Authors

Chawdhry Muhammad Yaqub
Paul G. Smith

Authors Affiliations

Chawdhry 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.

Publication Information

Hilgardia 40(12):459-470. DOI:10.3733/hilg.v40n12p459. January 1971.

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Abstract

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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Yaqub C, Smith P. 1971. Nature and inheritance of self-incompatibility in Capsicum pubescens and C. cardenasii. Hilgardia 40(12):459-470. DOI:10.3733/hilg.v40n12p459
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