Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/3510
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dc.contributor.authorHu, L.-
dc.contributor.authorLiao, W.-
dc.contributor.authorDawuda, M. M.-
dc.contributor.authorYu, J.-
dc.contributor.authorLv, J.-
dc.date.accessioned2022-03-28T13:14:40Z-
dc.date.available2022-03-28T13:14:40Z-
dc.date.issued2017-
dc.identifier.issn1471-2229-
dc.identifier.urihttp://hdl.handle.net/123456789/3510-
dc.description.abstractBackground: In northwest of China, mini Chinese cabbage (Brassica pekinensis) is highly valued by consumers, and is widely cultivated during winter in solar-greenhouses where low light (LL) fluence (between 85 and 150 μmol m−2s−1 in day) is a major abiotic stress factor limiting plant growth and crop productivity. The mechanisms with which various NH4+: NO3− ratios affected growth and photosynthesis of mini Chinese cabbage under normal (200 μmol m−2s−1) and low (100 μmol m−2 s−1) light conditions was investigated. The four solutions with different ratios of NH4+:NO3− applied were 0:100, 10:90, 15:85 and 25:75 with the set up in a glasshouse in hydroponic culture. The most appropriate NH4+: NO3− ratio that improved the tolerance of mini Chinese cabbage seedlings to LL was found in our current study. Results: Under low light, the application of NH4+: NO3− (10:90) significantly stimulated growth compared to onlyNO3− by increasing leaf area, canopy spread, biomass accumulation, and net photosynthetic rate. The increase in netphotosynthetic rate was associated with an increase in: 1) maximum and effective quantum yield of PSII; 2)activities of Calvin cycle enzymes; and 3) levels of mRNA relative expression of several genes involved in Calvin cycle. In addition, glucose, fructose, sucrose, starch and total carbohydrate, which are the products of CO2assimilation, accumulated most in the cabbage leaves that were supplied with NH4 +: NO3− (10:90) under LLcondition. Low light reduced the carbohydrate: nitrogen (C: N) ratio while the application of NH4+: NO3− (10:90) alleviated the negative effect of LL on C: N ratio mainly by increasing total carbohydrate contents. Conclusions: The application of NH4+:NO3− (10:90) increased rbcL, rbcS, FBA, FBPase and TK expression and/or activities, enhanced photosynthesis, carbohydrate accumulation and improved the tolerance of mini Chinese cabbage seedlings to LL. The results of this study would provide theoretical basis and technical guidance for mini Chinese cabbage production. In practical production, the ratio of NH4 +:NO3− should be adjusted with respect to light fluence for successful growing of mini Chinese cabbageen_US
dc.language.isoenen_US
dc.publisherBioMed Centralen_US
dc.relation.ispartofseriesVol.17;Issue.22-
dc.subjectChlorophyll fluorescence imagingen_US
dc.subjectCalvin cycleen_US
dc.subjectRelative gene expressionen_US
dc.subjectLow light fluenceen_US
dc.subjectAmmoniumen_US
dc.subjectnitrate ratioen_US
dc.titleAPPROPRIATE NH4 +: NO3 − RATIO IMPROVES LOW LIGHT TOLERANCE OF MINI CHINESE CABBAGE SEEDLINGSen_US
dc.typeArticleen_US
Appears in Collections:Faculty of Agriculture, Food and Consumer Sciences



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