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<p>In sorghum [<i>Sorghum bicolor</i> (L.) Moench.] hybrid breeding, <i>milo</i> serves as the primary source of cytoplasmic male sterility and is widely utilized in commercial hybrid production. The risks associated with this limited cytoplasmic base are evident, prompting the identification of new diverse male sterile cytoplasmic sources such as A<sub>2</sub>, A<sub>3</sub>, A<sub>4</sub>, <i>maldandi</i>, <i>VZM</i>, and <i>G</i><sub><i>1</i></sub>. However, the commercial use of these sources has been hindered by challenges in fertility restoration. With this background a study was conducted at two environments, namely Regional Agricultural Research Station, Vijayapur (<i>rabi</i> 2022) and University of Agricultural Sciences, Dharwad (<i>rabi</i> 2023) to evaluate various sorghum germplasm lines for their ability to restore or maintain fertility on <i>maldandi</i> cytoplasm. Sixty-six diverse germplasm accessions were crossed as pollinators with M31-2A (<i>maldandi</i>) male sterile line. Based on the seed set on bagged ear heads of F<sub>1</sub> hybrids, the pollinators were classified as fertility restorers or maintainers. The restoration research indicated that eight pollinator lines exhibited strong fertility restoration (&gt; 90% seed set) on <i>maldandi</i> cytoplasm. These identified restorers viz<i>.</i>, 2118–3, IC 352433, IC 352208, IC 287925, PEC 18, EC 6, IC 352411, ST-GRPM-PU 31 will be useful in strengthening <i>maldandi</i> cytoplasm based <i>rabi</i> sorghum hybrid breeding programme.</p>

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Novel restorers identified for maldandi cytoplasm for enhancing the hybrid breeding in rabi sorghum

  • 期刊论文

  • 发表日期：

    2025年1月12日

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  • Basavaraj M. Pattanashetti,
  • G. M. Sajjanar,
  • R. Madhusudana,
  • N. G. Hanamaratti

摘要

In sorghum [Sorghum bicolor (L.) Moench.] hybrid breeding, milo serves as the primary source of cytoplasmic male sterility and is widely utilized in commercial hybrid production. The risks associated with this limited cytoplasmic base are evident, prompting the identification of new diverse male sterile cytoplasmic sources such as A2, A3, A4, maldandi, VZM, and G1. However, the commercial use of these sources has been hindered by challenges in fertility restoration. With this background a study was conducted at two environments, namely Regional Agricultural Research Station, Vijayapur (rabi 2022) and University of Agricultural Sciences, Dharwad (rabi 2023) to evaluate various sorghum germplasm lines for their ability to restore or maintain fertility on maldandi cytoplasm. Sixty-six diverse germplasm accessions were crossed as pollinators with M31-2A (maldandi) male sterile line. Based on the seed set on bagged ear heads of F1 hybrids, the pollinators were classified as fertility restorers or maintainers. The restoration research indicated that eight pollinator lines exhibited strong fertility restoration (> 90% seed set) on maldandi cytoplasm. These identified restorers viz., 2118–3, IC 352433, IC 352208, IC 287925, PEC 18, EC 6, IC 352411, ST-GRPM-PU 31 will be useful in strengthening maldandi cytoplasm based rabi sorghum hybrid breeding programme.