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Ma B.,CAS Wuhan Botanical Garden | Ma B.,University of Chinese Academy of Sciences | Zhao S.,CAS Wuhan Botanical Garden | Zhao S.,University of Chinese Academy of Sciences | And 14 more authors.
Tree Genetics and Genomes | Year: 2016

Soluble sugars and organic acids have a strong impact on the overall organoleptic quality of fruits. In this study, we report the identification of quantitative trait loci (QTLs) for individual sugars and organic acids in apple. A high density linkage map of apple was constructed using the 1536 EST-derived SNP GoldenGate genotyping platform. The linkage map consists of 601 molecular markers, including 540 single nucleotide polymorphisms (SNPs) and 61 simple sequence repeats (SSRs), spanning 1368.4 cM with an average of 2.28 cM per marker. The contents of soluble sugars, including sucrose, glucose, fructose, sorbitol, and organic acids, including malic acid and citric acid, were used as the phenotypic data in QTL analysis. Two QTLs for malic acid content were detected on linkage groups (LGs) 8 and 16, while no QTL was found for citric acid content. Four QTLs for the glucose, sucrose, fructose, and sorbitol content were found to be clustered in one region on LG 3. Moreover, an additional QTL for glucose content was detected on the LG 4. Our study not only expands our understanding of the genetic basis for fruit organoleptic quality but it also provides molecular markers that will aid in marker-assisted selection for fruit quality in apple breeding programs. © 2015, Springer-Verlag Berlin Heidelberg. Source


Yan Z.-Y.,Liaoning Province Institute of Pomology | Lu T.-X.,Liaoning Province Institute of Pomology | Wang D.-M.,Liaoning Province Institute of Pomology | Liu Z.,Liaoning Province Institute of Pomology | Yi K.,Liaoning Province Institute of Pomology
Zhiwu Shengli Xuebao/Plant Physiology Journal | Year: 2015

In order to evaluate cold tolerance of dormant shoots from six apple cultivars, we measured the contents of malondialdehyde (MDA) and proline, and the activity of peroxidase (POD) after the shoots were treated at six different temperatures from -45℃ to -20℃. It was found that MDA content was always high in 'Wangshanhong' shoots, and was always low and stable in 'Qiyuexian' after low temperature treatment. POD activity in 'Qiyuexian' shoots was highest, but was not significantly different from those in other cultivars. Proline content in 'Yueyanghong' shoots was highest and significantly higher than others, while there was no difference among the others. Proline level in 'Qiyuexian' shoots was stable. The results indicate that cold tolerance of 'Qiyuexian' is strongest and of 'Wangshanhong' is weakest, and of other cultivars is intermediate. The apple cultivars with strong cold tolerance show low and stable level of MDA, stable level of proline and high activity of POD in shoots. ©, 2015, Science Press. All right reserved. Source

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