Identification of QTLs Associated with Conversion of Sucrose to Hexose in Mature Fruit of Japanese Pear View Full Text


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Article Info

DATE

2018-07-31

AUTHORS

Sogo Nishio, Toshihiro Saito, Shingo Terakami, Norio Takada, Hidenori Kato, Akihiro Itai, Toshiya Yamamoto

ABSTRACT

Sweetness is the most important trait for fruit breeding and is fundamentally determined by both total and individual sugar contents. We analyzed the contents of sucrose, fructose, glucose, and sorbitol in mature fruit in an F1 population derived from crossing modern Japanese pear cultivar ‘Akizuki’ and breeding line ‘373-55’. A genetic linkage map was constructed using simple sequence repeats (SSRs) and single-nucleotide polymorphisms (SNP). We identified two regions associated with individual sugar contents on linkage group (LG) 1 and LG 7. The percentages of the variance in sucrose, fructose, and glucose explained by the quantitative trait loci (QTLs) were 26.6, 15.9, and 18.5%, respectively, for the region on LG 1, and 22.2, 20.0, and 9.5%, respectively, for the region on LG 7. In both regions, genotypes associated with increases in sucrose were associated with decreases in both fructose and glucose. The 1.5-LOD support intervals of the QTLs on LGs 1 and 7 include SSRs within the regions flanking acid invertase genes PPAIV3 and PPAIV1, respectively. Because acid invertase is a key enzyme in the conversion of sucrose to hexose, these are promising candidates for genes underlying those QTLs and controlling individual sugar contents. We also found one region on LG 11 that explained 21.4% of the variation in total sugar content but was not significantly associated with variation for individual sugars. The information obtained in this study will accelerate research and breeding programs to improve fruit sweetness. More... »

PAGES

643-652

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    http://scigraph.springernature.com/pub.10.1007/s11105-018-1106-y

    DOI

    http://dx.doi.org/10.1007/s11105-018-1106-y

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    https://app.dimensions.ai/details/publication/pub.1105927357


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