Cytogenetical studies on Oryza sativa L. I. Studies on the haploid plant of Oryza sativa, by TOSHITARO MORINAGA and EIJI FUKUSHIMA

Morinaga, T.

Jap Jour Bot 7(1/2): 73-106


Accession: 024431441

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Five haploid rice plants were found among the F1 to F4 offspring of intervarietal hybrids, and 2 more in common varieties under ordinary cultivation. They were highly sterile; 1245 plants propagated vegetatively from 1 haploid produced, under field conditions, 13,800 haploid ears of which 37 produced 1 or 2 seeds each. Somatic chromosome doubling occurs fairly often, and a fairly large number of fertile ears were thereby produced. Artificial pollination with diploid pollen after castration produced a 1.06% set of seeds; pollination without cas-tration produced 2.41%. Seeds set on the haploid plants produce only diploid progeny. Small parthenocarpic caryopses are very frequently produced. At meiosis in both E.M.C. and P.M.C. the chromosomes are mostly univalent, but 1 or 2 loosely united bivalents occurred in 37 out of 135 PM.C.