Stability of Cytoplasmic Genetic Male Sterility and Fertility Restoration in Pigeonpea uri icon

abstract

  • In cytoplasmic genetic male sterility-based (CGMS) hybrid seedproduction, instability of expression of male-sterility and fertilityrestoration across a wide range of environments are two of themajor difficulties. Therefore, the present study was carried out toinvestigate the stability of male sterility of nine CGMS lines underthree dates of sowing and the fertility restoration of 10 CGMS-basedpigeonpea ( Cajanus cajan (L.) Millsp.) hybrids at three differentlocations. Significant variability existed for pollen fertility amonghybrids and sterility among cytoplasmic male sterile (CMS) lines.All the hybrids except ICPH 3494 and ICPH 3491 exhibited high(>80%) pollen fertility across locations. Hybrids ICPH 2671, ICPH2740, and ICPH 3933 had 100% male-fertile plants across locations.All the CMS lines had completely male-sterile plants acrosssowing dates. The CMS lines BRG1 A, Hy3C A, BRG3 A, and TTB7 Aexhibited 100% pollen sterility at different sowing dates. The pooledanalysis revealed a significant genotype × environment interactionfor pollen fertility and sterility. The genotypic main effect+ GE (GGE) biplot of hybrids showed that hybrids ICPH 2671,2740, 3933, and 3461 were stable for fertility restoration. With theexception of ICPA 2047 and ICPA 2051, all the CMS lines werehighly stable with high mean performance and least distance fromAEA (average environmental axis). Male-sterility in A4 cytoplasmwas independent of environmental conditions. Different dates ofsowing did not affect expression of male sterility of these CMS lines

publication date

  • 2015
  • 2015