Production and characterization of intergeneric hybrid between rice (Oryza sativa) and salt tolerant species, Porteresia coarctata
1997
Elloran, R.M. | Talag, J.D. | Abassi, F. | Flores, J. | Brar, D.S. (International Rice Research Inst., Los Banos, Laguna (Philippines). Plant Breeding, Genetics and Biochemistry Div.)
Various biotic and abiotic stresses affect rice productivity. Salinity is one of the important stresses lowering rice production. There is a limited genetic variability for salt tolerance in the cultivated and wild species of Oryza. One of the related genera, Porteresia coarctata (2n=48) has high degree of tolerance to salt. Previous efforts at IRRI to produce hybrid between these two genera have been unsuccessful. Recently, following sexual crosses and embryo rescue, intergeneric hybrid between O. sativa and P. coarctata have been successfully produced. The hybrid is slow growing and is intermediate in morphological characteristics between the two species. Isozyme and RFLP analysis showed extensive polymorphism between rice and P. coarctata. The meiotic behaviour of the F1 hybrid showed occurrence of univalents and irregular distribution of chromosomes at anaphase 1. The hybrid is completely male sterile. It is vegetatively multiplied and will be used in back-crossing for the transfer of genes for salt tolerance from P. coarctata to rice
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