Cytogenetics of F, Hybrids from Oryzo Sharma ef Shastry — O. sativa L. Institure of Plant Breeding, University of the Philippines at Los Baflos: International RiceResearch Institute, Los Banos, Laguna, Philippines; and Department of Life Sciences, University of the Philippines at Los Banos, respectively

Abstract

Oryza nivara Sharma et Shastry, an annual wild species, the prototype of which is most probably the ancestor of the cultivated Asian rice (Chang 1976), is of equal interest to rice geneticists and breeders alike. A strain of O. nivara (IRRI Accession No. 101508) collected from northeast Uttar Pradesh state of India is the only strain in the rice taxa known to date that has strong resistance to the grassy stunt virus (Ling et al. 1970). Cytogenetic studies on species relationships between O. sativa and its wild relatives, which have a variety of dubious designations such as “O. perennis” and “O. fatua”, have been made by Japanese, Chinese, and American researchers (cf. Chang 1964, Nayar 1973). The relationship between O. sativa and O. nivara has not been investigated, however, as O. nivara was formally described and named as recently as 1965 (Sharma and Shastry 1965). © 1979, Japan Mendel Society, International Society of Cytology. All rights reserved.

Source or Periodical Title

Cytologia

ISSN

114545

Page

527-540

Document Type

Article

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