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Thai jasmine rice cultivar KDML105 carrying Saltol QTL exhibiting salinity tolerance at seedling stage

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Abstract

Saltol, the major salinity tolerance quantitative trait loci (QTL) in rice, was introgressed from IR66946-3R-230-1-1 (FL530) into Khao Dawk Mali 105 (KDMl105) by two rounds of marker-assisted backcrossing (MAB). Twenty-eight BC2F2 introgression lines (BILs) with positive Saltol allele (BIL+Saltol) and 19 BILs with negative Saltol allele (BIL−Saltol) were validated for the effect of Saltol as key salinity tolerant trait at seedling stage. A hydrophonic system with salt stress of 12 dS m−1 (130 mM Na+) was conducted, and significant differences between BILs+Saltol and BILs−Saltol were observed for the period of plant survival (PPS), total K+ (T-K+) and Na+ (T-Na+) concentration, whole plant Na+-K+ ratio (T-Na+/K+), shoot Na+ (S-Na+) and K+ (S-K+) concentration, and shoot Na+-K+ ratio (S-Na+/K+). BILs+Saltol displayed higher PPS, uptake less Na+ (T-Na+; 43.4 ppm), and more K+ (T-K+; 30.9 ppm), while the BILs−Saltol uptake more Na+ (T-Na+; 45.7 ppm) and less K+ (T-K+; 28.2 ppm). Direct effects on PPS and salt injury score (SIS) were observed, indicating Na+/K+ homeostasis mechanism by the Saltol under hydrophonic salt stress. All BILs+Saltol recovered KDML105 cooking quality profile such as low apparent amylose content (AAC), high score of alkaline spreading value (ASV), intermediate gel consistency (GC), and strong fragrance. However, variation in agronomic traits was observed. The possibility of lowering S-Na+/K+ ratio under salt stress at seedling stage in KDML105 by introgression of the Saltol was demonstrated. Currently, BC2F7 of the BIL+Saltol selected lines are being tested for salinity tolerance in the salt-affected areas in the northeast of Thailand.

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Acknowledgments

This work was supported in part by the Rockefeller Foundation and the Cluster and Program Management, National Science and Technology Development Agency (NSTDA), Thailand. We thank all the staff of Rice Gene Discovery Unit and the graduate students in the MAS lab for their technical support in the laboratory, greenhouse, and field. We also thank the staff of Ubon Ratchathani Rice Research Center for their support in the salt tolerance evaluation.

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  1. Rice Gene Discovery Unit, National Center for Genetic Engineering and Biotechnology (BIOTEC, NSTDA), Kasetsart University, Kamphaeng Saen, Nakhon Pathom, 73140, Thailand

    K. Punyawaew, M. Siangliw, M. Thida, J. Lanceras-Siangliw & T. Toojinda

  2. Plant Breeding Program, Faculty of Agriculture at Kamphaeng Saen, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom, 73140, Thailand

    K. Punyawaew

  3. Nakhon Ratchasima Rice Research Center, Pimai, Nakhon Ratchasima, Thailand

    D. Suriya-arunroj

  4. School of Agriculture and Food Sciences, The University of Queensland, St. Lucia, QLD,, Australia

    S. Fukai

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  1. K. Punyawaew
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Punyawaew, K., Suriya-arunroj, D., Siangliw, M. et al. Thai jasmine rice cultivar KDML105 carrying Saltol QTL exhibiting salinity tolerance at seedling stage. Mol Breeding 36, 150 (2016). https://doi.org/10.1007/s11032-016-0574-8

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