Inbreeding and true seed in tetrasomic potato. I. Selfing and open pollination in Andean landraces (Solanum tuberosum Gp. Andigena) |
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Authors: | Ali M Golmirzaie Rodomiro Ortiz Gary N Atlin Masaru Iwanaga |
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Institution: | (1) International Potato Center (CIP), Apartado Postal 1558, Lima 100, Perú, XX;(2) Royal Veterinary and Agricultural University, Thorvaldsensvej 40, DK 1871 Frederiksberg C, Copenhagen, Denmark Fax: +45 3528 3468 E-mail: ro@kvl.dk, DK;(3) Department of Plant Science, Nova Scotia Agricultural College, PO Box 550, Truro, Nova Scotia B2N 5E3, Canada, CA;(4) International Plant Genetic Resources Institute, Via delle Sette Chiese 142, 00145 Rome, Italy, IT |
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Abstract: | True potato seed (TPS) may be an alternative method of potato production in developing countries. A breeding method for the
sexual propagation of this vegetatively propagated crop should consider the development of parental lines and the type of
cultivar to be released. Open-pollinated (OP) cultivars seem to be an inexpensive procedure to produce potato from true seed.
However, OP progenies are the result of selfing and outcrossing in male-fertile tetraploid potatoes. The aim of the present
research was to establish the effect of inbreeding and open pollination in TPS. Ten Andigena clones were used as parental material to derive hybrid (S0), inbred (S1 and S2), and open-pollinated (OP1 and OP2) generations. Significant differences among generations were found for pollen production, pollen viability (as determined
by its stainability with aceto-carmine glycerol), number of flowers and berries plant-1, number of seeds berry-1, weight of 1000 seeds, and tuber yield plant-1. The parental populations were significantly different for most of the traits, but not for flower production and berry weight.
The interaction of population ×generation was significant for pollen and seed production as well as for weight for 1000 seeds.
All the traits evaluated except seed weight showed a strong inbreeding depression, while the OP progenies had intermediate
values between the S0 and the S1. This demonstrates that open pollination in potatoes is not exclusively the product of selfing; it also results from outcrossing.
Received: 10 November 1997 / Accepted: 3 March 1998 |
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Keywords: | Synthetic cultivars True potato seed |
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