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Fertility expression of thermo-sensitive genic male sterile genes under the backgrounds of indica cytoplasmic male sterile lines, restorer lines and maintainer lines

Fertility expression of thermo-sensitive genic male sterile genes under the backgrounds of indica cytoplasmic male sterile lines, restorer lines and maintainer lines

Zhongguo Shuidao Kexue 20(5): 487-492

Fertilities of generations of 51 F-1, 19 F-2 and 6 BC1 derived from 3 thermo-sensitive genic male sterile lines (TGMS-lines) Pei'ai 64S, 6311S and 360S and three-lines including 7 indica cytoplasmic male sterile lines (CMS-lines) and their corresponding maintainer lines(B-lines) and 3 indica restorer lines(R-lines) were investigated to study the expression of TGMS-genes under the backgrounds of the three-line. The TGMS trait of Pei'ai 64S was governed by 2 pairs of independent recessive genes and Pei'ai 64S had stronger fertility restoring(Rf) genes for CMS-lines; The TGMS trait of 6311S was conferred by a single recessive gene and 6311S had a pair of weaker Rf-gene; the TGMS trait of 360S was controlled by a single recessive gene and 360S had no Rf-gene. After studying on the fertility of F-1 plants between 5 CMS-lines and 4 TGMS generations selected from F-2 plants of 4 CMS-lines/6311S, it was confirmed that the expression of TGMS-gene was controlled by Rf-gene under the background of CMS, but not affected by Rf-gene under the background of normal fertile cytoplasm. The potential breeding strategies of TGMS-lines under the background of CMS and CMS-lines with the nucleus of TGMS-genes were discussed.

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