Effects of Elevated CO2 Concentration on Growth and Physiological Characteristics of Different Coix Cultivars
Utilizing Xingren white husk and Anguo black husk Coix as test materials,the study examined the effects of changing CO2 concentration on the growth and physiological characteristics of Coix.Relevant indicators were identified and two CO2 concentrations were set:natural(400±20 μmol/mol)and high(800±20 μmol/mol).The results showed that the increase of CO2 concentration significantly promoted the morphological growth and biomass accumulation of Coix,and the total biomass of Xingren white husk and Anguo black husk increased by 30.00％and 20.85％,respectively.The CO2 concentration increased,and the coixin content of two cultivars decreased significantly,and the decrease in Xingren white husk was even greater.With the increase of CO2 concentration,the catalase(CAT)activity of Xingren white husk increased significantly by 133.89％,the activity of superoxide dismutase(POD)and malondialdehyde(MDA)content decreased significantly,and the activities of CAT and POD of Anguo black husk decreased significantly,with a decrease of 69.25％and 56.37％,respectively.With the increase of CO2 concentration,the zeatin(ZA)and gibberellin(GA3)contents of Xingren white husk increased significantly,the content of auxin(IAA)and abscisic acid(ABA)decreased significantly,the decrease rate were 38.04％and 27.91％,respectively,the contents of ZA,IAA and ABA in Anguo black husk decreased significantly,the IAA content changed significantly by 64.91％,and the GA3 content increased significantly by 66.39％.In conclusion,a rise in CO2 concentration could encourage the growth of Coix,and the impact of Coix's physiological traits varied throughout varieties,and the Anguo black husk Coix was more susceptible to CO2 levels.
CO2 concentrationCoix lacryma-jobi L.GrowthPhysiological characteristic
万方数据
