Liaoning Institute of Fruit Science

Yingkou, China

Liaoning Institute of Fruit Science

Yingkou, China
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Sha S.,Nanjing Agricultural University | Sha S.,Liaoning Institute of Fruit Science | Li J.,Liaoning Institute of Fruit Science | Wu J.,Nanjing Agricultural University | Zhang S.,Nanjing Agricultural University
African Journal of Agricultural Research | Year: 2011

The contents of organic acids in the fruit of 40 cultivars of four major pear species, Pyrus ussuriensis, Pyrus bretschneideri, Pyrus pyrifolia, and Pyrus communis, were examined using high performance liquid chromatography (HPLC). The results showed that the major components of organic acids present in the pear fruit were malic and citric acids. The total organic acid content and the individual contents of malic, citric, and quinic acids were significantly higher in the fruit of P. ussuriensis than in the other three species. Among the ten organic acids examined, both malic and citric acids exhibited highly significant positive correlation with quinic acid, whereas extremely significant negative correlation was observed between acetic and lactic acids, and between succinic and fumaric acids. Furthermore, significant positive correlation was observed between malic and citric acids, and between quinic acid and shikimic acids, whereas significant negative correlation was found between quinic and tartaric acids. The differences in the contents of the 10 individual organic acids and the total organic acid content in the fruit of the 40 pear cultivars reached a significant and strong level. © 2011 Academic Journals.


Sha S.F.,Nanjing University | Sha S.F.,Liaoning Institute of Fruit Science | Li J.C.,Liaoning Institute of Fruit Science | Wu J.,Nanjing University | Zhang S.L.,Nanjing University
African Journal of Microbiology Research | Year: 2011

Changes in the content of citric acid and malic acid and the activities of enzymes involved in the metabolism of these two organic acids, including citrate synthase (CS), aconitase (ACO), isocitrate dehydrogenase (IDH), phosphoenolpyruvate carboxylase (PEPC), NAD-malate dehydrogenase (NADMDH) and NADP-malic enzyme (NADP-ME) were examined during the process of fruit development in 'Dangshansuli' pear. The citric exhibited an overall decreasing trend and the malic acid content exhibited an overall increasing trend in developing fruit. The activities of CS, NAD-IDH, NAD-MDH and NADP-ME showed an overall increasing trend and the activities of Cyt-ACO and PEPC exhibited an overall decreasing trend in developing fruit. The correlation analysis of the change in the organic acid content and related metabolic enzyme activities during the development of the fruit revealed that CS, ACO, IDH, PEPC, NAD-MDH and NADP-ME are considered important enzymes that affect the synthesis of citric acid and malic acid in pear fruits. © 2011 Academic Journals.


Sha S.-F.,Nanjing Agricultural University | Sha S.-F.,Liaoning Institute of Fruit Science | Li J.-C.,Liaoning Institute of Fruit Science | Wu J.,Nanjing Agricultural University | Zhang S.-L.,Nanjing Agricultural University
African Journal of Agricultural Research | Year: 2011

Changes in the content of citric acid and malic acid and the activities of enzymes involved in the metabolism of these two organic acids, including citrate synthase (CS), aconitase (ACO), isocitrate dehydrogenase (IDH), phosphoenolpyruvate carboxylase (PEPC), NAD-malate dehydrogenase (NADMDH) and NADP-malic enzyme (NADP-ME) were examined during the process of fruit development in 'Xinping' pear. The citric and malic acid content exhibited an overall increasing trend in developing fruit. The activities of CS, NAD-IDH and NAD-MDH showed an overall increasing trend and the activities of Cyt-ACO, PEPC and NADP-ME exhibited an overall decreasing trend in developing fruit. The correlation analysis of the change in the organic acid content and related metabolic enzyme activities during the development of the fruit revealed that CS, ACO, IDH, PEPC, NAD-MDH and NADP-ME are considered important enzymes that affect the synthesis of citric acid and malic acid in pear fruits. © 2011 Academic Journals.


Sha S.,Nanjing Agricultural University | Sha S.,Liaoning Institute of Fruit Science | Li J.,Liaoning Institute of Fruit Science | Wu J.,Nanjing Agricultural University | Zhang S.,Nanjing Agricultural University
African Journal of Biotechnology | Year: 2011

Changes in the content of citric and malic acids and the activities of enzymes involved in the metabolism of these two organic acids, including citrate synthase (CS), cytoplast aconitase (Cyt-ACO), NAD-isocitrate dehydrogenase (NAD-IDH), phosphoenolpyruvate carboxylase (PEPC), NAD-malate dehydrogenase (NAD-MDH) and NADP-malic enzyme (NADP-ME), were examined during the process of leaf development in 'Dangshansuli' pear. The citric acid content exhibited an overall slightly decreasing trend and the malic acid content exhibited an overall appreciably increasing trend in developing leaf. The activities of CS, Cyt-ACO, NAD-IDH, PEPC and NAD-MDH all showed an overall decreasing trend, whereas the activities of NADP-ME indicated an overall increasing trend. The correlation analysis of the change in the organic acid content and related metabolic enzyme activities during the development of the leaf revealed that the activities of CS, Cyt-ACO and NAD-IDH showed a negative correlation with the content of citrc acid, the activities of PEPC exhibited a positive correlation with the content of malic acid, the activities of NAD-MDH and NADP-ME indicated a negative correlation with the content of malic acid. © 2011 Academic Journals.

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