Pyramiding of qDTY1.1 and qDTY3.1 into rice mega-variety Samba Mahsuri-Sub1: physiological performance under water deficit conditions

    Rai, M and Chucha, D and Deepika, D and Lap, B and Magudeeswari, P and Padmavathi, G and Singh, N and Tyagi, W (2023) Pyramiding of qDTY1.1 and qDTY3.1 into rice mega-variety Samba Mahsuri-Sub1: physiological performance under water deficit conditions. Physiology and Molecular Biology of Plants, 29. pp. 1931-1943. ISSN 0974-0430

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    Abstract

    Water deficit is a crucial factor causing huge loss to rice productivity. The present study aimed to develop a multiple stress tolerant genotype by pyramiding drought tolerant yield QTLs qDTY1.1 and qDTY3.1 into high yielding rice variety Samba Mahsuri Sub-1(SMS) through marker assisted pyramiding. To achieve this six introgression lines of SMS carrying qDTY1.1 (SAB) were crossed with DRR-50, an Essentially Derived Variety of SMS carrying qDTY3.1. The SAB lines are taller than SMS due to tight linkage between qDTY1.1 and wild type SD-1. Therefore, F2 generation of crosses were screened for recombinants between SD-1 and qDTY1.1. Phenotyping of 1530 F2 plants representing three F2 populations from 35 F1 hybrids, identified 305 dwarf plants. Three dwarf F2 plants along with three others carrying qDTY1.1 and qDTY3.1 were forwarded to F3 generation. From the six F3 (SABD) lines fourteen pyramided progenies were selected and forward to F4 generation. The six SABD F3 lines SABD-7, SABD-8, SABD-9, SABD-76, SABD-79 and SABD-80 along with parents were evaluated under moisture stress (MS) for various physiological parameters. Chlorophyll and relative water content were more, while canopy temperature and malonaldehyde (MDA) content were lesser in SABD lines compared to parents indicating tolerance under MS. Variance due to genotypes was highly significant for all the yield related traits except test weight. Based on seed morphology, agronomic characters and physiological parameters six superior lines SABD-9-3, SABD-9-2, SABD-9-6, SABD-9-7, SABD-76-2 and SABD-76-6 performing better under MS were identified, which could be released after multi-location evaluation.

    Item Type: Article
    Divisions: Global Research Program - Accelerated Crop Improvement
    CRP: UNSPECIFIED
    Uncontrolled Keywords: Moisture stress, Marker assisted pyramiding, qDTY1.1, qDTY3.1, Rice
    Subjects: Others > Rice
    Depositing User: Mr Nagaraju T
    Date Deposited: 15 Feb 2024 04:11
    Last Modified: 15 Feb 2024 04:11
    URI: http://oar.icrisat.org/id/eprint/12475
    Official URL: https://link.springer.com/article/10.1007/s12298-0...
    Projects: UNSPECIFIED
    Funders: UNSPECIFIED
    Acknowledgement: The research work was supported by funding from Department of Biotechnology, Govt. of India (Grant Nos. BT/PR/1454/AGR/02/745/2010; BT/PR18611/AGIII/103/921/2016). DC, DD and BL were supported by scholarships from CAU (Imphal), Indian Council of Agricultural Research (National Talent Scholarship) and University Grants Commission, respectively.
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