The Investigation of Pollen-Pistil Relationship in Crosses Between Two Subspecies of Cultivated Potato with Wild Allotetraploid Relatives

Document Type : Research Paper

Authors

1 Assistant Professor, Department of Horticultural Sciences, Faculty of Agriculture, University of Tabriz

2 Propessor, Department of Crop Production and Breeding, Faculty of Agriculture, University of Tabriz

3 Professor, Department of Biology, Faculty of Natural Sciences, University of Tabriz

Abstract

The result of interspecific crosses in potato mainly is explained by endosperm balance number (EBN) or effective ploidy hypothesis. However in some of interspecific crosses the pre-zygotic barriers are also functional. In this experiment the crossability of four wild allotetraploid 2EBN, species (Solanum acaule, S. fendlerii, S. hjertingii and S.stoloniferum) with 11 tetraploid clones belonging to two subspecies of S. tuberosum  (ssp. andigena and tuberosum) were investigated. The results indicated that the incidence of pre-zygotic incompatibility were lower when the wild species used as pistilate parents than reciprocal crosses. Among wild allotetraploid species, S. acaule had the lowest penetration and barrier capacity and between the two cultivated subspecies ssp. tuberosum had low barrier capacity as compared with ssp. andigena. Overly from 1169 performed inter-specific inter-EBN crosses four hybrids were obtained, two from stoloniferum × tuberosum, one from hjertingii × tuberosum and one from fendlerii × tuberosu. The first three hybrids were tetraploid (2n = 4x = 48) and the last one was hypotetraploid (2n = 4x-2 = 46).
 
 

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Volume 1, Issue 2 - Serial Number 2
February 2010
Pages 55-63

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