Improving male fertility restoration of common wheat for Triticum timopheevii cytoplasm |
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| Authors: | Q-F Chen P Wehling |
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| Institution: | Laboratory of Genetics, Biology Department, Guizhou Normal University, Baoshan Beilu 116, Guiyang 550001, Guizhou, PR China;E-mail: |
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| Abstract: | The fertile pure line R3‐37 of common wheat with cytoplasm of Triticum timopheevii Zhuk. is an R‐line (restorer) that can restore the male fertility of A‐lines (male sterile lines) with T. timopheevii cytoplasm. In breeding hybrid wheat, the hybrid of the cross R3‐37/ Baimian3 was found to be completely male sterile, indicating that Baimian3 has some genes that are epistatic to the Rf genes in R3‐37. In order to elucidate the essence of this phenomenon, the male fertilities of the hybrids of 27 crosses including R3‐37 and/or Baimian3 were studied. The results show that inheritance of male fertility of the hybrid R3‐37/Baimian3 involves interactions among Rf alleles, male fertility‐inhibiting genes and genetic background. Although more than 70 different kinds of male sterile cytoplasm to common wheat have been discovered, the systems of hybrid wheat production based on male sterile cytoplasm are all the A‐line/R‐line type and all have similar problems of hybrid fertility restoration. This study confirmed that there is a new model (A‐line/R*‐line//R‐line) for producing hybrid wheat with high fertility restoration. In the new model, the completely male sterile hybrids of A‐line/R*‐line can act as common A‐line. |
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| Keywords: | Triticum aestivum T timopheevii cytoplasmic male sterility fertility restoration hybrid wheat |
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