Breeding Behavior of Diploid Interspecific Hybrid Potatoes

Year 2026, Volume: 13 Issue: 1, 12 - 17, 14.03.2026

Jaber Panahandeh

https://doi.org/10.19159/tutad.1747332

https://izlik.org/JA32BP24NF

Abstract

In order to introducing the germplasm of Solanum commersonii a wild diploid species to the cultivated potato the meiosis and crossability of three interspecific hybrids obtained from the interspecific cross of S. verrucosum as a bridge species with S. commersonii were investigated. For encouraging the flowering hybrid plants were grafted on tomato rootstocks and planted in greenhouse. Male fertility was assessed by pollen stainability and cross ability by using them in cross with S. commersonii and with S. phureja as a cultivated diploid species. One of these three hybrids was fully male sterile with deformed flower and anthers, but the two others had more than 40 percent of viable pollen. However, use of them as male parent in cross with cultivated diploid potato was not successful, while as female parent these hybrids successfully were crossed with diploid cultivated potatoes as well as with its male parent (S. commersonii). The interspecific hybrids displayed rather regular microsporogenesis. Chromosomes pairing in metaphase I was exclusively as bivalent that followed by predominantly regular anaphase. The investigation of pollen tube penetration in some cross revealed that main crossing failure in these hybrids is due to post zygotic barrier. The progeny of these interspecific hybrids with cultivated diploid potatoes had improved tuberization and crossing efficiency with cultivated material.

Keywords

Solanum verrucosum , S. commersonii , microsporogenesis , germplasm , cross ability

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