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Wang H.-B.,Chinese Academy of Agricultural Sciences | Wang H.-B.,Key Laboratory of Biology and Genetic Improvement of Horticultural Crops Germplasm Resources Utilization | Wang X.-D.,Chinese Academy of Agricultural Sciences | Wang X.-D.,Key Laboratory of Biology and Genetic Improvement of Horticultural Crops Germplasm Resources Utilization | And 8 more authors.
Chinese Journal of Applied Ecology | Year: 2015

High chilling requirement grape (Vitis vinifera-V. labrusca cv. Summer Black) was used to evaluate its dormancy under short sunlight day (SD), long sunlight day (LD) and natural condition (CK). The results indicated that grape bud dormancy could be induced by natural low temperature and short sunlight alone or together. Short sunlight was the main contributor to the dormancy of grape bud, followed by natural low temperature. SD had more effect on dormancy induction under the same temperature when compared with LD. The grape dormancy induction stopped when the total respiratory rate reached the highest level. During the dormancy induction period, the proportion of pentose phosphate pathway (PPP) operation activity or capacity to total respiratory rate increased from 16.0% to 20.1% or 22.3% to 26.0%, respectively; similarly, the proportion of operation activity or capacity of alternate pathway to total respiratory rate rapidly increased, i.e., from 19.4% to 27.3% or 38.2% to 46.8%. Both low temperature and short sunlight could induce change of respiratory pathway on electron transport chain level. © 2015, Editorial Board of Chinese Journal of Applied Ecology. All right reserved. Source


Shi X.-B.,Chinese Academy of Agricultural Sciences | Shi X.-B.,Key Laboratory of Biology and Genetic Improvement of Horticultural Crops Germplasm Resources Utilization | Liu F.-Z.,Chinese Academy of Agricultural Sciences | Liu F.-Z.,Key Laboratory of Biology and Genetic Improvement of Horticultural Crops Germplasm Resources Utilization | And 10 more authors.
Chinese Journal of Applied Ecology | Year: 2015

The effects of three canopy shapes, i.e., vertical canopy, V-shaped canopy and horizontal canopy, on canopy microenvironment, quality of leaves and fruits were studied in the 3-year-old grape 'Jingmi' grafted on 'Beta' in greenhouse. The results showed that gap fraction and openness of vertical canopy were significantly higher than that of V-shaped canopy and horizontal canopy, and leaf area index, light interception rate and canopy temperature difference between day and night were significantly lower than those of V-shaped canopy and horizontal canopy. There was no significant difference between the latter two treatments. The palisade thickness of V-shaped canopy was significantly greater than that of vertical canopy, and horizontal canopy was in the middle. The chlorophyll and carotenoid contents of V-shaped canopy were significantly higher than those of vertical canopy and horizontal canopy, and those in the latter two treatments had no significant difference. The fruit quality of V-shaped canopy was the best, and that of horizontal canopy was the worst. The results of GC-MS analysis showed that 29 types of volatile aroma compounds were detected in V-shaped canopy, but just 17 and 16 in vertical canopy and horizontal canopy, respectively. In V-shaped canopy, the characteristic aroma in grape 'Jingmi' was higher, except ethanol, trans-2-hexene-1-alcohol, 2-octyl ketone and formic acid ester. The linalool content in vertical canopy and V-shaped canopy was higher than that in horizontal canopy. The nerol content in V-shaped canopy was higher than that in vertical canopy and horizontal canopy, and the leaf alcohol content in V-shaped canopy and horizontal canopy was higher than that in vertical canopy. The citronellol was detected only in V-shaped canopy. In greenhouse, the fruit aroma of V-shaped canopy grape was stronger, and well reflected the variety characteristics. © 2015, Editorial Board of Chinese Journal of Applied Ecology. All right reserved. Source

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