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Identification of two QTLs associated with high fruit acidity in apple using pooled genome sequencing analysis

Horticulture Research 2020年第1期7卷 560-573页

作者： seunghyun ban Kenong Xu Horticulture Section School of Integrative Plant ScienceCornell AgritechCornell UniversityGenevaNY 14456USA

Acidity is a critical component determining apple fruit quality.Previous studies reported two major acidity quantitative trait loci(QTLs)on linkage groups(LGs)16(Ma)and 8(Ma3),respectively,and their homozygous genotypes mama and ma3ma3 usually confer low titratable acidity(TA)(10mgml^(−1))acidity levels.To date,the genetic control for high-acidity apples remains essentially unknown.In order to map QTLs associated with high acidity,two genomic DNA pools,one for high acidity and the other for regular acidity,were created in an interspecific F1 population Royal Gala(Malus domestica)×PI 613988(M.sieversii)of 191 fruit-bearing progenies.By Illumina paired-end sequencing of the high and regular acidity pools,1,261,640 single-nucleotide variants(SNVs)commonly present in both pools were detected.Using allele frequency directional difference and density(AFDDD)mapping approach,one region on chromosome 4 and another on chromosome 6 were identified to be putatively associated with high acidity,and were named Ma6 and Ma4,respectively.Trait association analysis of DNA markers independently developed from the Ma6 and Ma4 regions confirmed the mapping of Ma6 and Ma4.In the background of MaMa,20.6%of acidity variation could be explained by Ma6,28.5%by Ma4,and 50.7%by the combination of both.The effects of Ma6 and Ma4 in the background of Mama were also significant,but lower.These findings provide important genetic insight into high acidity in apple.

关键词： fir acidity analysis

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The influence of environmental factors on species composition and distribution in a community forest in Northern Thailand

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Journal of Forestry Research 2021年第2期32卷 649-662页

作者： Siriluck Thammanu Dokrak Marod Hee Han Narayan Bhusal Lamthai Asanok Pipat Ketdee Noppakoon Gaewsingha seunghyun Lee Joosang Chung Department of Forest Sciences Seoul National UniversitySeoul 08826Republic of Korea Royal Forest Department Bangkok 10900Thailand Department of Forest Biology Faculty of ForestryKasetsart UniversityBangkok 10900Thailand Department of Forest Policy and Economics National Institute of Forest ScienceSeoul 02455Republic of Korea Department of Agroforestry Maejo UniversityPhrae CampusPhrae 54140Thailand Department of National Parks Wildlife and Plant ConservationBangkok 10900Thailand Research Institute of Agriculture and Life Sciences Seoul National UniversitySeoul 08826Republic of Korea

Understanding the environmental factors that influence tree species composition is essential for successful management of biodiversity and sustainable use of community forest resources.This study aims to assess tree species composition and distribution in the deciduous ban Mae Chiang Rai Lum Community Forest in Northern Thailand and to analyze the influence of environmental factors on tree biodiversity in the forest.We conducted a stratified systematic sampling of the forest’s total area of 3925 ha,and twenty-five 0.16 ha survey plots were established in three different stands of the deciduous forests to estimate and characterize the difference in biological diversity among the stands.Canonical correspondence analysis(CCA)was used to investigate the environment factors affecting such differences in biodiversity of the stands.The results showed a high diversity of trees in the forest as 197 species,144 genera,and 62 plant families were recorded.The CCA ordination identified the environmental factors—the most important of which were elevation,distance to streams,soil moisture,organic matter,and distance to communities—that signifi-cantly influenced the diversity and distribution of tree species(p<0.05)in the community forest.Our findings indicate that the implementation of drought reduction measures such as building check dams,fire protection,and monitoring community forest-product usage would be recommended to further biodiversity conservation and the sustainable use of community forest resources.

关键词： Community forest management Species biodiversity Canonical correspondence analysis ban Mae Chiang Rai Lum community forest Northern Thailand

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