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Diurnal variations in the contents of water-soluble carbohydrates in Vicia sativa L.

Research Paper | July 1, 2018

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Kunlun Liang, Jinhao Sun, Mingyan Wang

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Int. J. Biosci.13( 1), 283-290, July 2018

DOI: http://dx.doi.org/10.12692/ijb/13.1.283-290


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Diurnal variation in water-soluble carbohydrate (WSC) may influence the grazing behavior and dietary preferences of ruminants. Feeding forage with high WSC content could increase growth rates of livestock. Quantifying diurnal variation in WSC will be helpful in designing the management strategies to obtain the herbage in higher WSC content. The objective of the present study was to investigate the diurnal variation in WSC content of Vicia sativa on Qinghai-Tibetan plateau. Two sets 24h continuous sampling were conducted on 20% and 80% blooming stage, respectively.  And sampling was conducted every 3 hours from 06:00 to 06:00 (the following day). It found that, the content of WSC and sucrose were lowest at sunrise and then increased till the following midday, but fructan reached its highest level at nightfall. In addition, the content of sucrose was higher in 80% blooming stage than that in 20% blooming stage during daytime, but lower in the night. Conversely, the concentration of fructan was higher in 20% blooming stage than that in 80% blooming stage. The result may suggest that carbon fixed during photosynthesis is directed firstly towards sucrose, andfructan synthesis occurred mostly during the end of the light period as the synthesis of sucrose decreased. In conclusion, Vicia sativa should be harvest between noon and sundown for greater WSC concentration on Qinghai-Tibetan plateau.


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Diurnal variations in the contents of water-soluble carbohydrates in Vicia sativa L.

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