A quantitative trait locus,qSE3, promotes seed germination and seedling establishment under salinity stress in rice

Citations Over TimeTop 10% of 2018 papers

Abstract

Seed germination is a complex trait determined by both quantitative trait loci (QTLs) and environmental factors and also their interactions. In this study, we mapped one major QTLqSE3 for seed germination and seedling establishment under salinity stress in rice. To understand the molecular basis of this QTL, we isolated qSE3 by map-based cloning and found that it encodes a K+ transporter gene, OsHAK21. The expression of qSE3 was significantly upregulated by salinity stress in germinating seeds. Physiological analysis suggested that qSE3 significantly increased K+ and Na+ uptake in germinating seeds under salinity stress, resulting in increased abscisic acid (ABA) biosynthesis and activated ABA signaling responses. Furthermore, qSE3 significantly decreased the H₂ O₂ level in germinating seeds under salinity stress. All of these seed physiological changes modulated by qSE3 might contribute to seed germination and seedling establishment under salinity stress. Based on analysis of single-nucleotide polymorphism data of rice accessions, we identified a HAP3 haplotype of qSE3 that was positively correlated with seed germination under salinity stress. This study provides important insights into the roles of qSE3 in seed germination and seedling establishment under salinity stress and facilitates the practical use of qSE3 in rice breeding.

Related Papers

• → Seedling Vigor and the Early Nonphotosynthetic Stage of Seedling Growth in Grasses1(1966)58 cited
• Preliminary study of ZS new seedling-agent on growth of rice seedling(2000)
• Analysis of Effects of Different Seedling Raising Patterns on Tobaoco in Panzhihua Sichuan Tobacco Area(2012)
• Study on Nurserying Technique of Seedling-Transplanting(2001)
• EFFECT OF SEEDLING DISK HEIGHT AND SEEDLING DENSITY ON TOBACCO SEEDLINGS GROWTH(2012)