, H. 2015. Effects of different photorespiration inhibitors on photosynthetic characteristics and berry quality of Vitis amurensis Rupr. Can. J. Plant Sci. 95: 417Á426. The effects of two photorespiration inhibitors on photosynthetic characteristics and berry quality of Vitis amurensis Rupr. were studied. The experiments used V. amurensis variety 'Shuang hong' as the experimental grape, NaHSO 3 (sodium bisulfite) and isoniazide (INH) as the photorespiration inhibitors with three different spray concentrations, respectively. Results show that both photorespiration inhibitors improved the soluble solids (SS) contents and SS/total acid (TA) ratios (except the 350 mg L(1 INH treatment) in V. amurensis berries; two inhibitors can also improve the concentrations of glucose, sucrose, arabinose, lactose as well as monosaccharides (MS) and MS'disaccharides (DS) contents, and at the same time decrease the TA contents in V. amurensis berries. Meanwhile, all NaHSO 3 treatments had higher SS, SS/TA, glucose, and sucrose than treatments with the same concentrations of INH. However, the arabinose contents in all the INH treatments were higher than those in NaHSO 3 treatments at the same concentrations. Compared with INH treatments, NaHSO 3 were better at increasing net photosythesis rate (Pn), Rubisco carboxylation efficiency (CE), intercellular CO 2 concentration (Ci) and decreasing photorespiration rate (Pr). However, the effects of NaHSO 3 and INH on fluorescent characteristics of V. amurensis leaves were not significant. The fact that maximal values for photochemical efficiency of photosystem II complex (PSII) in the dark (F v /F m ) in this study were large indicate that both NaHSO 3 and INH had positive effects on chlorophyll fluorescence of V. amurensis leaves, which meant they had the ability to release surplus light energy and mitigate photoinhibition by inhibiting photorespiration at all three concentrations. Comprehensive analysis clearly indicates that NaHSO 3 had better effects on photorespiration inhibition and fluorescent characteristics, and improved photosynthesis and the quality of V. amurensis grape berries, especially at 250 mg L Liu, L., Wang, Z., Zhao, X., Nan, L., Nan, H., Wang, S. et Li, H. 2015. Effets de la photorespiration diffe´rent sur les caracte´ristiques photosynthe´tiques et la qualite´de Vitis amurensis Rupr. Can. J. Plant Sci. 95: 417Á426. Les effets de deux inhibiteurs de photorespiration sur les caracte´ristiques photosynthe´tiques et la qualite´des baies de Vitis amurensis Rupr. ont e´te´e´tudie´s. Les expe´riences ont porte´es sur la varie´te´'Shuang hong'. Le NaHSO 3 (bisulfite de sodium) et le INH (isoniazide) ont e´te´utilise´s comme inhibiteurs de la photorespiration a`trois concentrations diffe´rentes. Les re´sultats ont montre´que les deux inhibiteurs de la photorespiration (a`l'exception du traitement au INH 350 mg L (1 ) ame´liorent le contenu en SS (solides solubles) et le ratio SS/AT (SS/acide total). Les teneurs en glucose saccharose, arabinose, lactose, MS (monosaccharides) et...
, H. 2015. Effects of two training systems on sugar metabolism and related enzymes in cv. Beibinghong (Vitis amurensis Rupr.). Can. J. Plant Sci. 95: 987Á998. Eight individual sugars and four sugarmetabolism-related enzymes were investigated in the development of Vitis amurensis Rupr. 'Beibinghong' grape berries. Two different training systems, vertical shoot positioning (VSP) and Y-shaped training system (Y-shape) were applied. Sucrose contents in the two training systems were significantly related to the sucrose phosphate synthase (SPS) and sucrosynthetic activity of sucrose synthase (SS-s) in berries before veraison. The results show that throughout the veraison period, individual sugars, such as glucose, fructose, galactose and lactose, increased. Glucose and fructose were affected by both training systems, mainly at 15 and 16 wk (weeks after fruit setting). Training systems had no significant effects on the rhamnose, arabinose, galactose and maltose contents, and barely had an effect on the lactose content. The VSP training system mainly affected the sucrose content during the harvest period, while the Y-shape affected sucrose content mainly after 9 wk. During 2011 to 2013, VSP and Y-shape strongly affected the sucrose contents before veraison, and also affected the cleavage activity of sucrose synthase (SS-c) mainly between 5 and 8 wk; however, different training systems barely affected the soluble acid invertase (SAI) activities in whole berry growth. From the perspective of the whole berry development, the results showed that different systems had no significant effects on individual sugars and enzymes.
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