Artificial Polyploidy in the Oryzeae. IV

A tetraploid hybrid from the cross “diploid×autotetraploid” in rice, Oryza sativa L

Abstract

The morphological aspects and chromosome pairings of a tetraploid hybrid obtained from the cross between diploid and autotetraploid Oryza sativa were described. Besides its high sterility, the appearance of colour in its awns and its lateness in heading, the hybrid morphologically resembled its male parent, the autotetraploid. Meiosis was irregular; only univalents and bivalents were met with at first meiotic metaphase.