Fertility in an interspecific rice population and its effect on selection for rhizome length

Erik J Sacks, V. Schmit, K. L. McNally, M. T. Sta. Cruz

Research output: Contribution to journalArticle

Abstract

Fertility barriers, which are common in many wide crosses, can hinder efforts to introgress genes. In this study, we examined an intermated Oryza sativa/Oryza longistaminata population and assessed how fertility barriers affected selection for long rhizomes, a polygenic trait. Rhizomes are typical of O. longistaminata but not found in O. sativa. In the intermate population, we observed that pollen-fertility and self-fertility were generally low but exceptional individuals of high fertility were found in nearly all generations. About 1/5th of the genotypic variation for self-fertility was accounted for by pollen-fertility, based on a significant linear regression. Intermating improved self-fertility more than backcrossing for one generation. Heritability estimates via parent-offspring regression were 17 ± 7% for pollen-fertility and 39 ± 9% for self-fertility. The data indicated that many genes contributed to the fertility barriers. Individuals with relatively high fertility or long rhizomes (>8 cm) were observed infrequently in the intermated population, and there was no evidence of association between low fertility and presence of long rhizomes. By evaluating a large population, we were able to obtain a few rare recombinants that had both self-fertility greater than 10% and long rhizomes.

Original languageEnglish (US)
Pages (from-to)30-38
Number of pages9
JournalField Crops Research
Volume95
Issue number1
DOIs
StatePublished - Jan 8 2006
Externally publishedYes

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Keywords

  • Crossability
  • Fertility
  • Intermating
  • Interspecific crosses
  • Introgression
  • Oryza longistaminata
  • Oryza sativa
  • Perennial upland rice
  • Rhizome

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Soil Science

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