Effect of Root-zone CO2 Accumulation on Plant Growth,Root Bleeding Sap and Nitrogen Assimilation of Oriental Melon
《北方园艺》[ISSN:1001-0009/CN:23-1247/S]
- Issue:
- 2018年21
- Page:
- 99-106
- Research Field:
- Publishing date:
Info
- Title:
- Effect of Root-zone CO2 Accumulation on Plant Growth,Root Bleeding Sap and Nitrogen Assimilation of Oriental Melon
- Author(s):
- YIN Yang; XU Chuanqiang; LI Xuan; ZHAO Xi; LIU Yiling
- (College of Horticulture,Shenyang Agriculture University/Key Laboratory of Protected Horticulture,Ministry of Education/National & Local Joint Engineering Research Center of Northern Horticultural Facilities Design & Application Technology,Shenyang,Liaoning 110866)
- Keywords:
- root-zone CO2 concentration; oriental melon; plant growth; bleeding sap; nitrogen assimilation
- PACS:
- -
- DOI:
- 10.11937/bfyy.20181467
- Abstract:
- The oriental melon ‘Caihong 7’ was taken as material,the study was carried to investigate the changes of seedling growth,root bleeding sap,bleeding sap conductance and nitrogen uptake and metabolism related enzyme activity by the aeroponics culture CO2 automatic system in five CO2 concentrations (370 μL·L-1,2 000 μL·L-1,3 000 μL·L-1,4 000 μL·L-1 and 5 000 μL·L-1) during seedling growth period of oriental melon.In order to clear the change regularity that rhizosphere CO2 accumulation affecting melon growth and root absorption of nutrients.The results showed that the seedling growth was inhibited in treatments of root-zone CO2 concentration of 2 000 μL·L-1 or above compared with the treatment of CO2 concentration of 370 μL·L-1(control),the higher CO2 concentration,the greater inhibition.On the tenth day after treatments,plant height,stem diameter,root length and root volume were decreased significantly compared with those of control.And the total root absorption area and active absorption area were increased first and then decreased during the treatment days with root-zone CO2 concentration of 2 000 μL·L-1,3 000 μL·L-1,4 000 μL·L-1,5 000 μL·L-1.On the fifth day after treatments,root absorption capacity was higher than that of the control as different level.On the tenth day after treatments,the total root absorption area and active absorption area were significantly lower than the control.The change of root activity relatively laggard was significantly lower than the control from the fifteenth day.On the twenty-fifth day after treatments,the bleeding sap intensity,bleeding sap conductance and pH were reduced significantly.And that nitrogen accumulation and soluble protein content in bleeding sap of melon were significant decreased in root-zone 2 000 μL·L-1 CO2 or above concentration treatment.The activities of nitrogen metabolism related enzyme as H+-ATP enzyme,nitrate reductase (NR),glutamine synthetase (GS),glutamate synthase (GOGAT),glutamic acid oxaloacetate transaminase(GOT) and glutamic pyruvic transaminase (GPT) were significantly reduced.The rhizosphere CO2 concentration more than 2 000 μL·L-1 (≥10 days)would affect significantly seedling growth and the absorption of nitrogen and the transport capacity of oriental melon seedling.
Last Update: 2018-12-19