{"title":"Dry-fog Aeroponics Affects the Root Growth of Leaf Lettuce (Lactuca sativa L. cv. Greenspan) by Changing the Flow Rate of Spray Fertigation","authors":"Y. Hikosaka, M. Kanechi, Mizuki Sato, Y. Uno","doi":"10.2525/ECB.53.181","DOIUrl":null,"url":null,"abstract":"The growth characteristics and physiological activities of leaves and roots of lettuce cultivated in dry-fog aeroponics with different flow rates of nutrient dry-fog (FL, 1.0 m s (cid:4) 1 ; NF, 0.1 m s (cid:4) 1 ) were investigated under a controlled environment for two weeks and compared to lettuce cultivated using deep-flow technique (DFT). The growth of leaves of FL and DFT was not different and was significantly higher than that of NF. The amount of dry-fog particles adhering to the objects was higher in FL than in NF, so that the root growth in NF was significantly higher than that of FL. The respiration rate of roots was significantly higher in dry-fog aeroponics, but the dehydrogenase activity in the roots was significantly higher in DFT. There were no differences in the contents of chlorophyll and total soluble protein in the leaves or the specific leaf area. Photosynthetic rate and stomatal conductance were higher in dry-fog aeroponics. The contents of nitrate nitrogen, phosphate and potassium ions in the leaves were significantly higher in DFT, but the content of calcium ions was significantly higher in FL. Thus, changing the flow rate of the dry-fog in the rhizosphere can affect the growth and physiological activities of leaves and roots.","PeriodicalId":11762,"journal":{"name":"Environmental Control in Biology","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Control in Biology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2525/ECB.53.181","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"Agricultural and Biological Sciences","Score":null,"Total":0}
引用次数: 3
Abstract
The growth characteristics and physiological activities of leaves and roots of lettuce cultivated in dry-fog aeroponics with different flow rates of nutrient dry-fog (FL, 1.0 m s (cid:4) 1 ; NF, 0.1 m s (cid:4) 1 ) were investigated under a controlled environment for two weeks and compared to lettuce cultivated using deep-flow technique (DFT). The growth of leaves of FL and DFT was not different and was significantly higher than that of NF. The amount of dry-fog particles adhering to the objects was higher in FL than in NF, so that the root growth in NF was significantly higher than that of FL. The respiration rate of roots was significantly higher in dry-fog aeroponics, but the dehydrogenase activity in the roots was significantly higher in DFT. There were no differences in the contents of chlorophyll and total soluble protein in the leaves or the specific leaf area. Photosynthetic rate and stomatal conductance were higher in dry-fog aeroponics. The contents of nitrate nitrogen, phosphate and potassium ions in the leaves were significantly higher in DFT, but the content of calcium ions was significantly higher in FL. Thus, changing the flow rate of the dry-fog in the rhizosphere can affect the growth and physiological activities of leaves and roots.
不同营养干雾流量(FL, 1.0 m s (cid:4) 1)下干雾气培莴苣叶、根的生长特性及生理活性;在受控环境下,研究了0.1 m s (cid:4) 1)的NF,并与采用深流技术(DFT)栽培的生菜进行了比较。两种处理的叶片生长无显著差异,且显著高于NF处理。干雾培养液中附着在物体上的干雾颗粒量显著高于NF培养液,因此NF培养液中根系生长显著高于FL培养液。干雾气培法根系呼吸速率显著高于DFT,而DFT培养液中根系脱氢酶活性显著高于DFT培养液。叶片中叶绿素和总可溶性蛋白含量及比叶面积无显著差异。干雾气培的光合速率和气孔导度较高。叶片中硝酸盐氮、磷酸盐和钾离子含量在DFT中显著高于DFT,而钙离子含量在FL中显著高于DFT。由此可见,改变根际干雾流量可以影响叶片和根系的生长和生理活动。