Developing perennial upland rice I: Field performance of Oryza sativa/O. rufipogon F1, F4, and BC1F4 progeny

Erik J. Sacks, Jose P. Roxas, Maria Teresa Maria

Research output: Contribution to journalArticle

Abstract

Development of perennial upland rice (Oryza sativa L.) could improve food security for subsistence farmers while facilitating the conservation of natural resources, but the feasibility of breeding such a cultivar is unknown. The objective of this study was to determine if O. rufipogon Griff., the wild ancestor of cultivated Asian rice, would be a useful source of genes for introgressing perennial growth habit into cultivated rice. In two trials conducted at the International Rice Research Institute, cultivars were compared with interspecific F1s or with rapidly advanced F4 and BC1F4 families, respectively. After 1 yr, none of the cultivars survived but survival in progeny families ranged from 0 to 85.7%. Average survival for the F1s was 30.6% and only one family out of 31 had no survivors. Correlations between F1 family survival and parental O. rufipogon vigor at 9 mo and 20 mo indicated that at least 1 yr is needed to identify perennial genotypes. Fertility among the progeny was generally good, which should facilitate further breeding efforts. In contrast to the cultivars, which produced only one main crop at the end of the wet season, many progenies produced a ratoon crop during the dry season even though they were drought stressed. The ability to produce a dry season ratoon crop under upland conditions is a new opportunity for increasing food security of subsistence upland rice farmers. Breeding perennial cultivated rice should be feasible but it will likely take 5 to 10 more years.

Original languageEnglish (US)
Pages (from-to)120-128
Number of pages9
JournalCrop Science
Volume43
Issue number1
StatePublished - Jan 1 2003
Externally publishedYes

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Oryza rufipogon
Oryza sativa
highlands
rice
ratooning
cultivars
food security
dry season
breeding
farmers
growth habit
natural resources conservation
vigor
wet season
ancestry
drought
genotype
crops

ASJC Scopus subject areas

  • Agronomy and Crop Science

Cite this

Developing perennial upland rice I : Field performance of Oryza sativa/O. rufipogon F1, F4, and BC1F4 progeny. / Sacks, Erik J.; Roxas, Jose P.; Maria, Maria Teresa.

In: Crop Science, Vol. 43, No. 1, 01.01.2003, p. 120-128.

Research output: Contribution to journalArticle

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