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Feasibility of Hybrid Rice¹

Two rice varieties, representing a low tillering type and a profuse tillering type, were direct-seeded and transplanted at seven plant densities to determine the effect of planting method and plant population on yield. Three year's results show that transplanted rice was more productive than direct-seeded rice at all population densities with yields leveling off at 100 plants/m² plant density. At all population densities the profuse tillering type was nmre productive than the low tillering type. With the developmem: of a cytoplasmic male-sterile, the high cost of seed could be minimized by using low population rates without yield reductions. The greatest potential for F₁ hybrids appears to be in the transplanted rice areas of the world.

Segregating ratios from two sources of sterility could be explained by a single pair of recessive genes controlling sterility with one or more modifiers influencing the action. After a cytoplasmic male-sterile has been developed it appears cross-pollination will be the limiting factor in F₁ hybrid seed production.

Key Words: F₁ hybrids • sterility • population density • transplanting

² Superintendent and Assistant Professors, Rice-Pasture Research and Extension Center, Beaumont, Texas 77706.

Received for publication May 28, 1968.