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<p>Pea productivity is adversely affected by powdery mildew disease caused by <i>Erysiphe</i> spp. The recessive gene <i>er2,</i> identified in field pea accession ‘JI2480’, imparts broad-spectrum resistance to powdery mildews, including a newly identified species, <i>E. trifolii</i>. Here we report on development of <i>er2</i> near-isogenic lines&#xa0;(NILs) of a susceptible vegetable pea variety “PB89” using marker-assisted backcross breeding (MABB). The NILs exhibiting high percentage of recurrent parent genome recovery (92.68 to 95.12%) were similar to recurrent parent for all the horticultural traits except days to 50% flowering. All the <i>er2</i> introgressed NILs flowered earlier than PB89 possibly due to co-transfer of the <i>hr</i> allele for earliness with <i>er2</i> from the donor line P116. The NILs were resistant to powdery mildew both under controlled and polyhouse conditions. They were grouped into two distinct resistance classes; the first group, representing 15 NILs, exhibited a characteristic post-penetration hypersensitive response reminiscent of <i>er2</i> resistance, whereas four NILs displayed penetration resistance typified by the failure of germinated conidia to establish colonies, thus indicating that these lines harboured the <i>er1</i> gene also. The NILs showing proximity to PB89 have potential to replace the susceptible parental line for the management of powdery disease in peas.</p>

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Development and characterization of near-isogenic lines of vegetable pea (Pisum sativum L.) for resistance to powdery mildew

  • 期刊论文

  • 发表日期：

    2026年5月6日

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  • Sahil Kumar,
  • Kalpna Thakur,
  • Isha Sharma,
  • Aparajita Dwivedi,
  • Kamal Dev Sharma,
  • Viveka Katoch,
  • Rajeev Rathour

摘要

Pea productivity is adversely affected by powdery mildew disease caused by Erysiphe spp. The recessive gene er2, identified in field pea accession ‘JI2480’, imparts broad-spectrum resistance to powdery mildews, including a newly identified species, E. trifolii. Here we report on development of er2 near-isogenic lines (NILs) of a susceptible vegetable pea variety “PB89” using marker-assisted backcross breeding (MABB). The NILs exhibiting high percentage of recurrent parent genome recovery (92.68 to 95.12%) were similar to recurrent parent for all the horticultural traits except days to 50% flowering. All the er2 introgressed NILs flowered earlier than PB89 possibly due to co-transfer of the hr allele for earliness with er2 from the donor line P116. The NILs were resistant to powdery mildew both under controlled and polyhouse conditions. They were grouped into two distinct resistance classes; the first group, representing 15 NILs, exhibited a characteristic post-penetration hypersensitive response reminiscent of er2 resistance, whereas four NILs displayed penetration resistance typified by the failure of germinated conidia to establish colonies, thus indicating that these lines harboured the er1 gene also. The NILs showing proximity to PB89 have potential to replace the susceptible parental line for the management of powdery disease in peas.