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Development of Heat Tolerant Improved White Ponni throughMarker Assisted Introgression of QTLs Governing SpikeletFertility under High Temperature Stress

  • Author:D.Vijayalakshmi1*, P.Vivitha1, M.Arumugaperumal1 and M.Raveendran2

    Page No:404

    DOI:10.29321/MAJ.2018.000171
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Abstract

      The period from booting to flowering is the most sensitive stage to high temperature stress (HTS) in rice. The present study was aimed to improve the high temperature stress tolerance in Improved White Ponni. QTLs controlling spikelet fertility under HTS namely qHTSF 1.1 and qHTSF 4.1 was targeted for introgression from a tolerant donor Nagina 22 (N22) into Improved White Ponni (IWP) through marker assisted breeding. Number of spikelets opened per day and total flower count was taken at the time intervals (09.00 am, 11.00 am and 01.00 pm). Time taken to complete flowering was studied under control and stress conditions. The QTL introgressed lines had maximum flowering at 09.00 am and quickened the flowering period under high temperature stress which was induced using open top chambers maintained at temperatures ranging from 37.10ºC to 41.20ºC. Rice lines (# 295, 277 and 246) which contained both the QTLs for spikelet fertility had very less spikelet sterility percentage.
Key Words: Rice, High temperature stress, QTLs, Spikelet fertility, Yield

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Tamil Nadu, India.

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67% over Ni/C on carbon supports. The alkaline H2O2 pre-treatment of pearl millet and M. dubia showed less than 40% of biomass conversion into aromatics with more than 50% cellulose and hemicellulosic derivatives. The solid cox and gaseous loss for alkaline H2O2 pearl millet biomass sample were found to be 16.13% and 4.42 % for Ru- and 30.00% and 35.43 % for 1% Ru+ respectively with highest monomeric (97.84%) and least polymeric (2.16%) yield. Sugar derivatives such as diols and acids were detected more compared to lignin derivatives in alkali pretreated pearl millet. On the other hand, the alkaline H2O2 pre-treated M. dubia lignin registered a solid cox of 16.97%, gaseous loss of 12.95% and highest monomeric yield of 69.53% for 1% Ru+ which includes p-propyl syringol (0.32 mg.ml-1), p-propyl guaiacol (0.27 mg.ml-1), tetra-hydrofurfurol (0.12 mg.ml-1), p-ethyl syringol (0.08 mg.ml-1), syringol (0.05 mg.ml-1) and so on. From the results obtained, it can be concluded that alkaline H2O2 pre-treated M. dubia is a suitable candidate for lignin based bio-refineries for high value platform chemicals, whereas alkaline H2O2 pretreated pearl millet can be employed for bio-ethanol production.

Key words : Lignocellulosic-biomass, Alkaline H2O2, Catalysts, Depolymerization, Aromatics

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For MASU related issues :
SECRETARY
Madras Agricultural Students Union
Tamil Nadu Agricultural University
Coimbatore - 641 003
Tamil Nadu, India.

For MAJ related issues :
CHIEF EDITOR
Madras Agricultural Students Union
Tamil Nadu Agricultural University
Coimbatore - 641 003
Tamil Nadu, India.

Contact Us

Office: 0422-2436781 , 0422-2966781
Mobile: +91 8300947681

Email: masutnau@gmail.com
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Copyright @ 2019 Madras Agricultural Journal | Developed by Crystalpro All right reserved.

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    • Get In Touch

    For MASU related issues :
    SECRETARY
    Madras Agricultural Students Union
    Tamil Nadu Agricultural University
    Coimbatore - 641 003
    Tamil Nadu, India.

    For MAJ related issues :
    CHIEF EDITOR
    Madras Agricultural Students Union
    Tamil Nadu Agricultural University
    Coimbatore - 641 003
    Tamil Nadu, India.

    Contact Us

    Office: 0422-2436781 , 0422-2966781
    Mobile: +91 8300947681

    Email: masutnau@gmail.com
    masu@tnau.ac.in , maj@tnau.ac.in

    Social Media

    Copyright @ 2019 Madras Agricultural Journal | Developed by Crystalpro All right reserved.