Height,competition and yield potential in winter wheat |
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| Authors: | Julian B Thomas G Bruce Schaalje Marshall N Grant |
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| Institution: | (1) Station d'Amélioration des Plantes, I.N.R.A., B.P. 29, F 35650 Le Rheu, France;(2) Station d'Amélioration des Plantes, I.N.R.A., B.P. 29, F 35650 Le Rheu, France;(3) E.N.S.A.R., -65, rue de St Brieuc 35042, Rennes Cedex, France |
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| Abstract: | Summary A monogenic dominant male sterility is used for hybrid production in autumn and winter cauliflower. The ratio of male sterile plants in the backcross progenies of autumn cauliflower was 1:1 over five years (1987–1991). However, a significant deficit of male sterile plants was observed in the winter type over the same period.The influence of the temperature on the male sterile phenotype was studied within backcross progenies planted inside polythene tunnels. Six classes of phenotype were defined during the flowering period (from May to November). At low temperature, some male sterile plants developed partial to complete male fertility, whereas at high temperature, male fertile plants became male sterile.Segregation among the progenies of self-pollinated unstable male sterile plants did not deviate from the expected 3:1 ratio. Plants homozygous for the male sterility allele have been revealed by test crosses with a male fertile plant.For use in seed production, stable male sterile plants are vegetatively maintained; however, crossing lines isogenic except at the MS locus would allow male sterile plants to be raised from seed. |
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| Keywords: | Brassica oleracea var botrytis cauliflower genetic male sterility dominant gene temperature sensitivity hybrid seed production |
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