Madras Agricultural Journal
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Research Article | Open Access | Peer Review

Identification of critical sterility temperature (CST) and thermo sensitive stage in selected TGMS lines in rice (OryZa sativa L.)

Volume : 91
Issue: Jan-mar
Pages: 130 - 134
Published: June 13, 2023
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Abstract


Thermosensitive genic male sterility (TGMS) is a type of genetic male sterility expression regulated by certain temperature conditions. The knowledge of the critical sterility temperature and the critical thermosensitive stage for fertility alteration of TGMS lines is useful to determine most suitable time of their planting for multiplication or hybrid seed production. The experiment was conducted in mini phytotron. The critical sterility temperature of three TGMS lines viz. TGMS 6, TGMS 16 and TGMS 29 was assessed by subjecting them to different temperatures during reproductive stage. The pollen sterility percentage increased as the daily mean temperature increased and the genotypes behaved differently before they attain complete pollen sterility. The results that the CST of TGMS 6 was 28.0°C, TGMS 16 was 27.0°C and TGMS 29 was 27.5°C with 34.0, 33.0°C and 34.0°C the maximum temperatures respectively. Three TGMS lines were exposed to CST for different durations coinciding the various stages of panicle development to understand the critical stage of thermosensitivity for fertility alteration. In this study, 10-25 DBH was identified as critical thermosensitive stage for fertility alteration, which corresponds to differentiation of secondary branch primordiam, differentiation of pistil and stamen, formation of PMC and early meiosis stages (Stage 111 to IV).

DOI
Pages
130 - 134
Creative Commons
Copyright
© The Author(s), 2025. Published by Madras Agricultural Students' Union in Madras Agricultural Journal (MAJ). This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited by the user.

Keywords


Rice TGMS lines CST Critical stage of Thermosensitivity.
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