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Marker-assisted identification of restorer gene(s) in iso-cytoplasmic restorer lines of WA cytoplasm in rice and assessment of their fertility restoration potential across environments

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Abstract

Iso-cytoplasmic restorers possess the same male sterile cytoplasm as the cytoplasmic male sterile (CMS) lines, thereby minimizing the potential cyto-nuclear conflict in the hybrids. Restoration of fertility of the wild abortive CMS is governed by two major genes namely, Rf3 and Rf4. Therefore, assessing the allelic status of these restorer genes in the iso-cytoplasmic restorers using molecular markers will not only help in estimating the efficiency of these genes either alone or in combination, in fertility restoration in the hybrids in different environments, but will also be useful in determining the efficacy of these markers. In the present study, the efficiency of molecular markers in identifying genotypes carrying restorer allele of the gene(s) Rf3 and Rf4, restoring male fertility of WA cytoplasm in rice was assessed in a set of 100 iso-cytoplasmic rice restorers using gene linked as well as candidate gene based markers. In order to validate the efficacy of markers in identifying the restorers, a sub-set of selected 25 iso-cytoplasmic rice restorers were crossed with four different cytoplasmic male sterile lines namely, IR 79156A, IR 58025A, Pusa 6A and RTN 12A, and the pollen and spikelet fertility of the F1s were evaluated at three different locations. Marker analysis showed that Rf4 was the predominant fertility restorer gene in the iso-cytoplasmic restorers and Rf3 had a synergistic effect on fertility restoration. The efficiency of gene based markers, DRCG-RF4-14 and DRRM-RF3-10 for Rf4 (87%) and Rf3 (84%) genes was higher than respective gene-linked SSR markers RM6100 (80%) and RM3873 (82%). It is concluded that the gene based markers can be effectively used in identifying fertility restorer lines obviating the need for making crosses and evaluating the F1s. Though gene based markers are more efficient, there is a need to identify functional polymorphisms which can provide 100% efficiency. Three iso-cytoplasmic restorers namely, PRR 300, PRR 363 and PRR 396 possessing both Rf4 and Rf3 genes and good fertility restoration have been identified which could be used further in hybrid rice breeding.

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Author notes

  1. Amit Kumar

    Present address: Plant Breeding, ICAR RC for NEH Region, Umiam, Meghalaya, India

Authors and Affiliations

  1. Division of Genetics, ICAR-Indian Agricultural Research Institute, Pusa Campus, New Delhi, 110 012, India

    Amit Kumar, Prolay Kumar Bhowmick, Vikram Jeet Singh, Manoj Malik, S. Gopala Krishnan & Ashok Kumar Singh

  2. ICAR-Indian Agricultural Research Institute Regional Station, Pusa, Bihar, India

    Ashish Kumar Gupta

  3. ICAR-Indian Agricultural Research Institute Regional Station, Karnal, India

    R. Seth

  4. Rice Breeding and Genetics Research Centre, ICAR-IARI, Aduthurai, Tamil Nadu, 612101, India

    M. Nagarajan

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  1. Amit Kumar
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  2. Prolay Kumar Bhowmick
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  3. Vikram Jeet Singh
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  4. Manoj Malik
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  5. Ashish Kumar Gupta
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  8. S. Gopala Krishnan
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  9. Ashok Kumar Singh
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Correspondence to Ashok Kumar Singh.

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Kumar, A., Bhowmick, P.K., Singh, V.J. et al. Marker-assisted identification of restorer gene(s) in iso-cytoplasmic restorer lines of WA cytoplasm in rice and assessment of their fertility restoration potential across environments. Physiol Mol Biol Plants 23, 891–909 (2017). https://doi.org/10.1007/s12298-017-0464-5

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  • DOI: https://doi.org/10.1007/s12298-017-0464-5

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