Potassium Influences Expression of Key Genes Involved in Sorbitol Metabolism and Its Assimilation in Pear Leaf and Fruit |
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Authors: | Changwei?Shen,Yan?Li,Jie?Wang,Yosef?Al Shoffe,Caixia?Dong author-information" > author-information__contact u-icon-before" > mailto:cxdong@njau.edu.cn" title=" cxdong@njau.edu.cn" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author,Qirong?Shen,Yangchun?Xu |
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Affiliation: | 1.Jiangsu Provincial Key Lab for Organic Solid Waste Utilization/National Engineering Research Center for Organic-based Fertilizers/Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization/Key Laboratory of Plant Nutrition and Fertilization in Low-Middle Reaches of the Yangtze River, Ministry of Agriculture,Nanjing Agricultural University,Nanjing,China;2.Horticulture Section, School of Integrative Plant Science,Cornell University,Ithaca,USA;3.College of Resources and Environment Science,Henan Institute of Science and Technology,Xinxiang,China |
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Abstract: | Potassium (K+) plays a pivotal role in fruit quality improvement. Four K2O levels of 0 (K0), 150 (K1), 300 (K2), and 450 (K3) kg ha?1 were applied to pear (Pyrus bretschneideri Rehd) trees at different growth stages. The results showed that K increased individual fruit weight and yield, leading to a higher yield (16.7% on average) than K0. The leaf K concentration and sorbitol concentration in leaves and fruit were significantly increased by all four K2O levels. At all stages of development, the expression of sorbitol-6-phosphate dehydrogenase (PbS6PDH1), sorbitol dehydrogenase (PbSDH4 and PbSDH14), and sorbitol transporter (PbSOT9) genes in leaves was up-regulated by K, whereas PbS6PDH3, PbSDH2, PbSDH13, and PbSOT22 were down-regulated. During the young fruit stage, the expression of PbSDH2 and PbSDH4 in fruit was up-regulated by K, whereas at maturity, it was the opposite. Meanwhile, the up-regulation of PbS6PDH3, PbSDH12, PbSDH13, PbSDH14, and PbSOT22 in fruit was promoted by K from the enlargement stage II to the maturity stage, indicating that sorbitol assimilation and transport between source (leaf) and sink (fruit) were regulated by K. In conclusion, K regulated expression of key genes involved in sorbitol metabolism in both source and sink, leading to sugar accumulation for the improvement of fruit quality. |
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