Correlation analysis and QTL identification for canopy temperature, leaf water potential and spikelet fertility in rice under contrasting moisture regimes

• Published in: Chinese science bulletin 2005-02, Vol.50 (4), p.317-326
• Main Authors: Liu, Hongyan, Zou, Guihua, Liu, Guolan, Hu, Songpin, Li, Mingshou, Yu, Xinqiao, Mei, Hanwei, Luo, Lijun
• Format: Article
• Language: English
• Subjects: Canopies; Correlation analysis; Drought; Drought resistance; Epistasis; Fertility; Gene mapping; Leaves; Moisture effects; Quantitative trait loci; Soil moisture; Water potential; Water stress; Well water; 异位显性; 灌溉技术; 生物化学; 耐旱能力
• ISSN: 1001-6538; 2095-9273; 1861-9541; 2095-9281
• DOI: 10.1007/bf02897572

Canopy temperature (CT), leaf water potential(LWP) and spikelet fertility (SF) of a set of RILs (F9) from the cross between Zhenshan97B and IRAT109 were investigated under two soil moisture regimes in a drought screen facility. In water stress condition, CT was negatively correlated with SF (r = -0.2867) and LWP (r = -0.2740), and LWP was positively associated with SF (r = 0.1696). These results indicated that the plant with high drought tolerant ability could maintain higher LWP and lower CT, leading to highe rSF. A total of 44 main effect QTLs were associated with CT,LWP and SF. The accumulated contributions of QTLs for CT,LWP and SF were 87.85%, 15.06%, 79.46% under well water condition and 72.61%, 87.68%, 33.29% under stress condition, respectively. Totally 45 pairs of digenic interactions were detected. The accumulated contribution of digenic epistasis on CT, LWP and SF were 55.69%, 47.15%, 48.15% under well water condition and 53.44%, 57.94%, 54.62% under water stress condition. Compared with other drought tolerance QTL mapping researches in rice, 19 main effect QTLs were found to be located at the same or closely conjoint regions.