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Selection for yield, tuber specific gravity and high 2n pollen production in potato hybrids between Solanum tuberosum L. and the wild species Solarrum chacoense Bitt.^*

Otoniel Magalhães Morais^I; César Augusto Brasil Pereira Pinto^II

^IUniversidade Estadual do Sudoeste da Bahia (UESB), Estrada do Bem Querer Km 4, 45100-000 Vitória da Conquista, BA, Brasil
^IIDepartamento de Biologia, UFLA, Caixa Postal 37, 37200-000 Lavras, MG, Brasil. Send correspondence to C.A.B.P.P.

ABSTRACT

Hybrid clones between dihaploid Solarium tuberosum x wild potato species were developed to allow the introgression of desirable genes from wild germplasm into cultivated species, to increase the allelic diversity and to obtain maximum heterozygosity. A total of 167 hybrids were assessed in two experiments carried out in Lavras, State of Minas Gerais, to select hybrids with high tuber yield and greater than 5% 2n pollen production. There were highly significant differences among the clones, demonstrating wide genetic variability for all the assessed traits. The broad sense heritabilities at the level of clone means were relatively high for the traits assessed, indicating that gain with selection may be obtained. Selection was very efficient for tuber yield but the other traits showed relatively low gains, probably due to the low correlations found between tuber production and the other agronomic traits assessed. However, with the exception of specific gravity, significant gains would be obtained if selection was carried out directly on the individual traits.

Keywords: pollen; potato hybrids; Solanum tuberosum L.; Solarrum chacoense Bitt.

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* Part of a thesis presented by O.M.M. to Universidade Federal de Lavras (UFLA) in partial fulfillment of the requirements for the Master's degree.