Abstract
Flooding stress is a serious problem in soybean production, causing a remarkable yield reduction. The onset of rainy season during the early growth of soybean in Korea and some other parts of the world potentially subjects soybean plants to flooding stress. The objective of this study was to map quantitative trait loci (QTL) for flooding tolerance using a recombinant inbred line (RIL) population derived from a cross between ‘Danbaekkong’ (flood-tolerant) and ‘NTS1116′ (flood-susceptible) cultivars grown in a plastic house for two years. The plants were flood-stressed at the V1-V2 stage by ponding about 10 cm water from the soil surface. Leaf chlorophyll content and shoot dry weight were measured under control and flooded conditions to map the QTL. The genetic map was constructed using 1689 polymorphic markers obtained from the 180K Axiom® SoyaSNP markers used for genotyping the population. Ten QTL with 3.39−5.14 logarithm of odds scores and 8.1−30.7% phenotypic variations (PVE) were identified on seven chromosomes. One QTL on chromosomes 6 and 15 and two QTL on chromosome 7 were detected at least in two different environments causing up to 30.7% PVE, suggesting their potential applications in the breeding of flood-tolerant soybeans. The results could be useful in further exploring the genetic basis of flooding tolerance and developing tolerant cultivars of soybean.
Highlights
Increments in the production of major crops like wheat, corn, rice, and soybean are important for global food security
The parents for developing the recombinant inbred line (RIL) population were selected based on a previous report [42], in which 192 soybean germplasms were screened for flooding tolerance and found that
Since the abiotic stress tolerance in plants is a complicated and multi-dimensional phenomenon, analysis of the quantitative trait loci (QTL) for flooding tolerance by using the derived phenotypic data might be as useful as the data obtained from direct measurements
Summary
Increments in the production of major crops like wheat, corn, rice, and soybean are important for global food security. The yields of many crops are negatively affected by various factors including climate change, which is supposed to aggravate several biotic and abiotic stresses, like flooding [1,2]. Various efforts, including the development of tolerant cultivars, have been made to increase the yield of soybean by minimizing the negative effects of those stresses [3,4,5]. The coincidence of heavy rainfalls during the early growth stages makes the soybean plants liable to flooding stress in lowland, upland, as well as paddy fields under poor drainage conditions. The poorly drainable nature of paddy soils renders the soybean plants prone to flooding stress. The development of flood-tolerant soybeans could be of great importance to increase soybean yields under flooding stress conditions
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