Identification of QTLS tolerance to salinity in rice (Oryza sativa L.)

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International Journal of Development Research

Identification of QTLS tolerance to salinity in rice (Oryza sativa L.)

Abstract: 

Our attempts in this study were to identify QTLs which controlling the salinity tolerance of rice by using F2/F3 population which derived from the crossed combination between the Chanhtrui (high salinity tolerance) and Khangdan18 (susceptible) rice cultivars. The results have shown that: salinity tolerance was controlled by multiple genes. fresh and dried shoot weights of F3 rice lines ranged from 0.13g to 0.40g and from 0.05g to 0.12g respectively; Natri ion+ concentration in dry roots of the susceptible lines was higher than those of tolerance lines; Kali ion+ concentration in dried shoots and roots of the susceptible lines showed lower than those of tolerance lines; Natri ion+/Kali+ ion ratio in dried shoots and roots of tolerance lines were lower than those of susceptible lines. The molecular map was constructed to cover by 192 polymophic SSR markers which distributed on the 12 chromosomes with the total distance 1.797cM, and the average distance between two markers was 9.4cM. 10 QTLs were detected on the chromosomes 1, 3, 4, 6, 7 and 9; QTLs named as: qSFW-1a-CK, qSFW-1b-CK, qRK-1-CK, qSN-1-CK, qSDW-3-CK, qSTR-4-CK, qSNK-6-CK, qSDW-7-CK, qSNK-9-CK, qRNK-9-CK; flanking markers of QTL as: RM323-RM8144, RM449-RM8094, RM1287-RM8094, RM3412-RM220, RM2593-RM563, RM1359-RM127, RM141-RM253, RM5481-RM5720, RM242-RM460, RM105-RM287 respectively. Six QTLs (qSFW-1b-CK, qRK-1-CK, qSN-1-CK, qSTR-4-CK, qSNK-6-CK, qSDW-7-CK) had the nagetive AE (Additive effect) values which explained Khangdan18 variety contributed to increasing salinity tolerance. The qSTR-4-CK located on chromosome 4 is major QTL, because this QTL had the largest LOD (13.25) and phenotypic variation (39%).

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