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  • Title: [Effects of different NO3--N/NH4+-N ratios on cucumber seedlings growth, nitrogen absorption and metabolism under suboptimal temperature and light intensity].
    Author: Zhang XC, Liu YM, Bai LQ, He CX, Yu XC, Li YS.
    Journal: Ying Yong Sheng Tai Xue Bao; 2016 Aug; 27(8):2527-2534. PubMed ID: 29733140.
    Abstract:
    Cucumber (cv. Zhongnong 26) was used as material, the effects of NO3--N/NH4+-N ratios on growth and physiological characteristics of cucumber seedlings under suboptimal temperature and light intensity (18 ℃/10 ℃,180 ± 20 μmol·m-2·s-1) were studied. Total nitrogen in the nutrient solution was equal and three NO3--N/NH4+-N ratios, 26:2, 21:7 and 14:14, were applied as treatments. The results showed that cucumber treated by NO3--N/NH4+-N=21:7 had the longest total root length, the biggest root volume and root surface area, and the maximum number of root tips. H+-ATPase activity and relative expression of genes encoding nitrate transporter (NRT) and ammonium transporter (AMT) in cucumber roots were increased significantly by the treatment of NO3--N/NH4+-N=21:7. In addition, nitrate reductase (NR), glutamine synthetase (GS) and glutamate synthase (GOGAT) in cucumber leaves under the treatment of NO3--N/NH4+-N=21:7 were higher. As a result, the nitrogen content and biomass of cucumber were significantly increased. Compared with the plants under the treatment of NO3--N/NH4+-N=26:2 or 14:14, cucumber seedlings under the treatment of NO3--N/NH4+-N=21:7 had the highest biomass and total dry mass (DM) which were increased by 14.0% and 19.3% respectively under suboptimal temperature and light intensity. In conclusion, under suboptimal environmental conditions, NO3- -N/NH4+-N ratio could be adjusted to increase nitrogen absorption and metabolism of cucumber and alleviate the de-trimental effects caused by suboptimal conditions and promoted the cucumber growth. 以‘中农26’黄瓜为试材,研究亚适宜温光(18 ℃/10 ℃,180±20 μmol·m-2·s-1)下不同硝铵比(26:2、21:7和14:14)营养液对黄瓜幼苗生长和生理特性的影响.结果表明:硝铵比为21:7处理的黄瓜总根长最长、根体积和根表面积最大、根尖数最多;根中H+-ATPase活性最高;硝态氮转运蛋白(NRT)和铵转运蛋白(AMT)基因表达量也升高,提高了根系的氮吸收能力;叶中硝酸还原酶(NR)、谷氨酰胺合成酶(GS)和谷氨酸合酶(GOGAT)活性较高,提高了体内氮代谢能力,使黄瓜氮含量和干物质积累显著增加.亚适宜温光下,营养液中硝铵比为21:7时,黄瓜幼苗干质量分别比26:2和14:14处理增加14.0%和19.3%.亚适宜温光下,可通过调整营养液中硝铵比,提高黄瓜氮吸收与代谢能力,缓解亚适宜温光对黄瓜幼苗的不利影响,促进黄瓜生长.
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