Study On The Resistance Response And Purification Ability Of Three Fragrant Flower Plants To Indoor Benzene Pollution

Benzene is one of the"three invisible killers"indoors,with teratogenic,carcinogenic and mutagenic effects,and is a serious threat to human life.Plants have the function of absorption and purification,so choosing plants with strong anti-pollution and pollution-absorbing properties to carry out ecological restoration of the indoor environment has become an important way to combat indoor benzene pollution.As aromatic plants,they not only absorb carbon and release oxygen and beautify the environment,but also release fungicides,which have a strong function of purifying and restoring,and are the best type of plants to be planted in the indoor environment.Previous studies on benzene stress have focused on the selection of hanging plants and shade-tolerant foliage plants,which are relatively homogeneous,but few studies on fragrant flowering plants under benzene stress have been reported.Therefore,to investigate the resistance and purification ability of different aromatic plants to indoor benzene pollution,and to select the plant species with strong resistance and good purification effect,we can provide a theoretical basis for a more scientific selection of aromatic plants in human living environment and the construction of aromatic plant configuration for ecological remediation of indoor benzene pollution.In this study,Gardenia jasminoides,Jasminum sambac and Aglaia odorata were selected as the three most common fragrant flowering plants in the indoor environment that are highly adaptable to the polluted environment,and three benzene concentration gradients of 1.1mg·m^-3,2.2 mg·m^-3and 3.3 mg·m^-3were set by the closed fumigation method.Under benzene stress,the changes in the symptomatology,superoxide anion（O₂.^-）,chlorophyll（Chl）,malondialdehyde（MDA）,osmoregulatory substances,antioxidant system,purification rate and purification amount per unit leaf area were analyzed.Finally,the resistance and purification capacity of three fragrant flower plants under the stress of indoor benzene pollution were comprehensively evaluated using principal component analysis and subordinate function values.The results of the study showed that:（1）Three fragrant flowering plants are resistant to indoor benzene pollution.The symptomatology of the three fragrant flowering plants differed under the same benzene concentration stress,and an analysis of the resistance of the three fragrant flowering plants to benzene based on their symptomatology showed that Aglaia odorata was the most resistant.Benzene stress led to a decrease in the Chl content of the aroma plant,an accumulation of reactive oxygen species and an increase in membrane lipid peroxidation,and the aroma plant responded to the external stress by increasing the content of osmoregulatory substances and the activity of antioxidant enzymes in its body.When the benzene stress concentration reached its maximum,the main physiological and biochemical indexes of the three aromatic plants differed from the control group to a highly significant extent,with Gardenia jasminoides showing the largest decrease in Chl content,the largest increase in MDA and O₂.^-content,and the smallest increase in osmoregulatory substances and antioxidant enzyme activity;Aglaia odorata showed the smallest decrease in Chl content,the smallest increase in MDA and O₂.^-content,and the largest increase in osmoregulatory substances and antioxidant enzyme activity.and antioxidant enzyme activities.The resistance of the three aromatic plants to benzene pollution stress was evaluated using principal component analysis and the subordinate function value method,which showed that Aglaia odorata was the most resistant,followed by Jasminum sambac and Gardenia jasminoides was the least resistant.（2）There were differences in the purification capacity of the three fragrant flowering plants for indoor benzene pollution.As the benzene stress concentration increased,the purification rate of the three fragrant flowering plants tended to decrease and the purification amount per unit leaf area tended to increase,among which,the purification rate and the purification amount per unit leaf area of Jasminum sambac were the largest,with the purification rate of 48.12%,41.50%and 37.19%,respectively,and the purification amount per unit leaf area of 0.1287,0.2002 and 0.2600,respectively;the purification amount per unit leaf area of Gardenia jasminoides was the smallest,at 0.0651,0.0893 and 0.0898,respectively.The ability of three fragrant flowering plants to purify indoor benzene pollution was evaluated collectively:Aglaia odorata and Jasminum sambac had the stronger purifying ability and Gardenia jasminoides the weakest.（1）Combining the resistance response of the three fragrant plants to indoor benzene pollution and their ability to cleanse,it can be concluded that Aglaia odorata has a higher resistance to stain and pollution absorption in all,followed by Jasminum sambac,and Gardenia jasminoides has the weakest resistance to stain and pollution absorption.