Rambutan is a famous tropical fruit with a unique flavor and considerable economic value. However, the high vulnerability to postharvest browning leads to a short shelf life of rambutan fruit. Melatonin (MT) is an excellent bioactive molecule that possesses the potential to improve the storability of the harvested crops. In this study, the physiological mechanism of exogenous MT in affecting pericarp browning and senescence of postharvest rambutan fruit was investigated. Experimental results showed that the application of MT at 0.125 mmol L–1 appreciably retarded the advancement of pericarp browning and color parameters (L*, a*, and b*). MT treatment inhibited the increase in membrane relative electrolytes leakage (REL) while lowering the accumulation of reactive oxygen species (ROS) (■O2– and H2O2) and malonaldehyde (MDA). Reduced phenolics oxidation, as indicated by higher contents of total phenolics, flavonoids, and anthocyanins along with fewer activities of peroxidase (POD) and polyphenol oxidase (PPO), was detected in MT fruit compared with control fruit. MT treatment maintained the cellular redox state by inducing antioxidant enzyme activity and reinforcing the ascorbate-glutathione (AsA-GSH) cycle. Furthermore, the ultrastructural observation revealed that the spoilage of cellular and subcellular structures was milder in MT fruit than that in control fruit. The results suggest that MT could ameliorate the browning and senescence of rambutan fruit by inhibiting phenolic oxidation and enhancing the antioxidative process.
Agricultural information engineering research is mainly focused on precise agriculture, database integration system and network information, virtual agriculture, expert systems, the connotation and extension, development stage, the impact of agricultural modernization, existing problems, countermeasures, etc. Based upon organization subject and object of agricultural information services, the agricultural information service model is explored from the government-led, market-based, market chain, research consultation, cooperation ties, coordination and demonstration model and other aspects of radiation. Keywords-Information engineering; information service; agriculture;2011 978-1-4244-9763-8/11/$26.00 ©2011 IEEE
In rural education the role of information technology is the inevitable product to adapt to the characteristics of rural education. It is also the key to expand rural education resources, to speed up reform and development of rural education. Rural education information technology helps to change the rural cultural traditions, and conducive to the construction of rural teacher teams, which will help to improve rural teaching methods and the promotion of teaching methods, teaching philosophy, course content, faculty building changes, and also helps to adjust the structure of education in rural areas and promote the expansion of rural education structure, the structural nature of the change of rural education, rural education, structured content updates.
Ahstract-The rural education information technology is a complicated system in education. In recent years, although it has made some achievements, there still exists the problem, such as, the laggard concept, insufficient capital and infrastructure, invalid policy. For promoting the healthy and steady rural education information technology development, we should renew the idea, increase capital input and infrastructure construction. As well, we have to change to attention from quantity to quality and put forward the countermeasures on strengthening the effectiveness of policy implementation.
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