Please use this identifier to cite or link to this item: http://kb.psu.ac.th/psukb/handle/2016/19580
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dc.contributor.advisorUpatham Meesawat-
dc.contributor.authorBophal Sok-
dc.date.accessioned2024-07-25T08:20:08Z-
dc.date.available2024-07-25T08:20:08Z-
dc.date.issued2019-
dc.identifier.urihttp://kb.psu.ac.th/psukb/handle/2016/19580-
dc.descriptionMaster of Science (Biology (International Program)), 2019en_US
dc.description.abstractPhosphorus (P) deficiency is one of the major constraints for rice production due to its natural availability. The low P stress affects rice growth and yield, thereby food security. Using genetic markers to determine P-deficient tolerance is a promising tool to improve rice for sustainable production. Phosphate uptake 1 (Pupl-K46) is a diagnostic gene-based marker to confer the P-deficient tolerance in rice. This marker is dominantly conserved in upland ecotypes, but its presence in lowland rice cultivars has not yet been well-understood. In this study, thirty-one of the 61 Thai lowland rice cultivars were detected with the Pup/ region. Twenty to 21 lowland rice cultivars with and without the Pupl-K46 region were then selected and grown under half- or full- strength low P (0.25 or 0.5 mg/l) and high P (5 or 10 mg/l) Yoshida solutions for three or four weeks to determine the P-deficient tolerance, respectively. Results showed that the low P (LP) condition reduced rice biomass, total P concentration, P uptake, and Pi content in the rice tissues, except for chlorophyll content. Interestingly, the Pupl-K46+ cultivars maintained less shoot mass reduction and higher relative efficiency of P use (REP) than the Pupl-K46" cultivars under both LP conditions. Additionally, the Pupl- K46* cultivars accumulated higher root P concentration and P uptake as well as greater amount of Pi content in their shoot and root than the Pupl-K46 cultivars. These suggested that the Pupl-K46+ cultivars were more tolerant to the P starvation by holding superior shoot growth and accumulating higher P uptake and total P concentration via their roots. The Pupl-K46+ cultivars also maintained soluble Pi against low P availability by storing it in cytoplasm. It is therefore confirmed that the Pupl-K46 region empowers lowland rice cultivars to withstand the P deficiency like the upland rice ecotype.en_US
dc.language.isoenen_US
dc.publisherPrince of Songkla Universityen_US
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Thailand*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/th/*
dc.subjectRice Breeding Thailanden_US
dc.subjectPhosphorusen_US
dc.titleDetermination of Phosphorous-deficient Tolerance in Thai Lowland Rice Cultivars Based on Pup1-K46 Markeren_US
dc.typeThesisen_US
dc.contributor.departmentFaculty of Science (Biology)-
dc.contributor.departmentคณะวิทยาศาสตร์ ภาควิชาชีววิทยา-
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