Effects of Drought Tolerant Quantitative Trait Loci on Flowering Traits, Panicle Exsertion Rate, Spikelet Sterility and Grain Yield of Rice under Rainfed Lowland Conditions

Authors

  • Rathmuny Then Tropical Agriculture Program, Department of Agronomy, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand.
  • Jonaliza L. Siangliw Rice Gene Discovery Unit, National Center for Genetic Engineering and Biotechnology, Kasetsart University, Kamphang Saen, Nakhon Pathom 73140, Thailand.
  • Apichart Vanavichit Rice Gene Discovery Unit, National Center for Genetic Engineering and Biotechnology, Kasetsart University, Kamphang Saen, Nakhon Pathom 73140, Thailand.
  • Poonpipope Kasemsap International Study Center, Kasetsart University, Bangkok 10900, Thailand.
  • Shu Fukai The University of Queensland, School of Land, Crop and Food Sciences, Brisbane, Qld 4072, Australia.
  • Theerayut Toojinda Rice Gene Discovery Unit, National Center for Genetic Engineering and Biotechnology, Kasetsart University, Kamphang Saen, Nakhon Pathom 73140, Thailand.

Keywords:

drought tolerance, backcross introgression line, days to flowering, delay in flowering, panicle exsertion rate

Abstract

Drought hinders rice production and yield stability in rainfed lowland ecosystems. Quantitative trait loci (QTL) for root traits on chromosomes 1, 2, 7 and 9 in backcross introgression lines (BIL) of elite rice variety IR64, derived from Azucena/IR64, were designated as Targets 1, 2, 7 and 9 in the
present study. Severe stress developed during the period of optimum flowering as indicated by 98-100% yield reduction. Significant phenotypic variations in BIL were observed on days to flowering (DF), delay in flowering (DeF), panicle exsertion rate (PEX), percent spikelet sterility (PSS) and grain yield (GY). Variations among target QTL were also found in the traits studied, particularly under drought stress, indicating that BIL containing Targets 1 and 2 had early DF, higher PEX, lower PSS and higher GY under stress than those with Targets 7 and 9. Targets 7 and 9 lacked QTL for root thickness, indicating that it plays a role in drought tolerance under rainfed lowland conditions. Early flowering BIL had an advantage over later flowering ones because water can be extracted at the early drought stage, which can support the PEX and result in low PSS. In a very severe drought at the flowering stage, PSS directly affected GY. Further study of root morphology and early flowering under stress are necessary to improve rice yields under rainfed lowland conditions. 

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Published

2011-02-28

How to Cite

Rathmuny Then, Jonaliza L. Siangliw, Apichart Vanavichit, Poonpipope Kasemsap, Shu Fukai, and Theerayut Toojinda. 2011. “Effects of Drought Tolerant Quantitative Trait Loci on Flowering Traits, Panicle Exsertion Rate, Spikelet Sterility and Grain Yield of Rice under Rainfed Lowland Conditions”. Agriculture and Natural Resources 45 (1). Bangkok, Thailand:101-9. https://li01.tci-thaijo.org/index.php/anres/article/view/245138.

Issue

Vol. 45 No. 1 (2011): January-February

Section

Research Article

License

online 2452-316X print 2468-1458/Copyright © 2022. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/),
production and hosting by Kasetsart University of Research and Development Institute on behalf of Kasetsart University.