Gene Mapping, Cloning and Association Analysis for Salt Tolerance in Rice.

Xiaoru Fan,Jingguang Chen,Hongzhen Jiang,Lijun Meng

doi:10.3390/ijms222111674

Xiaoru Fan, Jingguang Chen + Show 2 more

Open Access

https://doi.org/10.3390/ijms222111674

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Abstract

Soil salinization caused by the accumulation of sodium can decrease rice yield and quality. Identification of rice salt tolerance genes and their molecular mechanisms could help breeders genetically improve salt tolerance. We studied QTL mapping of populations for rice salt tolerance, period and method of salt tolerance identification, salt tolerance evaluation parameters, identification of salt tolerance QTLs, and fine-mapping and map cloning of salt tolerance QTLs. We discuss our findings as they relate to other genetic studies of salt tolerance association.

Highlights

Land clearing, excessive irrigation, salt intrusion into coastal zones and sea-level rise has increased soil salinity, and this is a significant abiotic stress affecting crop production and quality [1]
A total of 6% of the world’s land area and 20% of irrigated agriculture have been affected by soil salinity
Genome-wide quantitative trait locus (QTL) analysis has been used to identify salt tolerance-related sites, and this has identified many QTLs related to rice salt tolerance

Summary

Introduction

Excessive irrigation, salt intrusion into coastal zones and sea-level rise has increased soil salinity, and this is a significant abiotic stress affecting crop production and quality [1]. Marker-assisted selection (MAS) and genetic engineering technology can accelerate the process of selecting for salt-tolerant rice varieties, but it is difficult to obtain salt-tolerant varieties for crop production by the insertion of single genes [8]. It is important to understand the molecular mechanisms and to identify the quantitative trait loci (QTL) and key genes of rice salt tolerance [1,9,10]. Genome-wide QTL analysis has been used to identify salt tolerance-related sites, and this has identified many QTLs related to rice salt tolerance. These studies have provided a foundation for the cloning of salt tolerance genes. This review summarizes research on rice salt tolerance gene mapping, cloning, and breeding applications to aid breeding of salt-tolerant varieties

QTL Mapping Population for Salt Tolerance

Period and Method of Salt Tolerance Identification

Salt Tolerance Evaluation Parameter

Salt Tolerance QTL

Evaluation Parameter for Salt Tolerance

RIL RIL RIL RIL IL

Fine Mapping and Map-Based Cloning of QTLs for Salt Tolerance in Rice

Association Analysis of Rice Salt Tolerance

Association Analysis of Salt Tolerance Candidate Genes

SSR Association Analysis of Salt Tolerance

Salt Tolerance Genome-Wide Association Analysis

Issues and Prospects