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  1. Vol. 7 No. 6, p. 648-650
     
    Received: May 1, 1967
    Published: Nov, 1967


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doi:10.2135/cropsci1967.0011183X000700060027x

Inheritance of Two Female-Sterile Characters in Dwarf-Internode Castor (Ricinus communis L.)1

  1. Raymond D. Brigham2

Abstract

Abstract

Two female-sterile characters in dwarf-internode castor were investigated and the inheritance of each appeared to be controlled hy a single recessive gene. The symbols fs1 and fs2 are proposed. In fs1, all pistillate flowers failed to open, and pollen-fertile staminate flowers tended to remain closed or only partially opened. Perianth segments in pistillate flowers were tightly fused. The epidermal cells of the perianth of flowers of both sexes were abnormally enlarged, resulting in a rough, pebble-like surface. Normal-monoecious plants had smooth epidermal layers. The perianths of the pistillate and staminate flowers were 25 and 40% thicker, respectively, in fs1 than in the variety ‘Hale.’

In fs2, pistillate and staminate flowers appeared normal, but capsules failed to enlarge after stigmas were fully exserted. The stigmas dried within a few days, followed by gradual drying of the capsules. Pollen was fertile and stained easily. Cause of the fs2 type female sterility was not apparent in this study.

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