[Objective] This study was to determine the response of Ficus microcarpa L. foliage to polyethylene glycol （PEG） simulated water stress using chlorophyll fluo- rescence imaging technique. [Method] The responses of d...[Objective] This study was to determine the response of Ficus microcarpa L. foliage to polyethylene glycol （PEG） simulated water stress using chlorophyll fluo- rescence imaging technique. [Method] The responses of detached leaves from Ficus microcarpa, Ficus benjamina and Nerium oleander to PEG-6000 simulated water stress were detected, and the chlorophyll fluorescence imaging technique was used to detect and analyze the stress at different spots of a single leaf simultaneously. [Result] The responses of Ficus microcarpa, Ficus benjamina and Nerium oleander to dehydration showed that： ~1~） the maximal photochemical efficiency （Fv/Fm） and non- photo-chemical quenching （NPQ） values were small in the reaction center among different detected spots of leaves, and there were great differences between relative electron transport rate （ETR）, photochemical quenching （qP） and quantum efficiency of PSII photochemistry （（φPSII）; （2） the differences of these parameters were more ob- vious among different spots of water-stressed leaves; （3） the discrete degrees of the species with strong resitances decreased significantly. [Conclusion] This study lays the foundation for the further research on the response of plants to drought stress using chlorophyll fluorescence imaging technique.展开更多
A new flavonoid with chalcone skeleton was isolated from the dried aerial roots of Ficus microcarpa. The structure of the compound was elucidated on the basis of spectral methods including 1D and 2D NMR. The new compo...A new flavonoid with chalcone skeleton was isolated from the dried aerial roots of Ficus microcarpa. The structure of the compound was elucidated on the basis of spectral methods including 1D and 2D NMR. The new compound showed weak inhibitory effect on nitric oxide production and cytotoxicity against K562 and PC3 cells.展开更多
In Three Gorges reservoir region,a great many of trees are needed for vegetation restoration and land greening following the massive constructions(e.g.construction of roads,highways,buildings)associated with the great...In Three Gorges reservoir region,a great many of trees are needed for vegetation restoration and land greening following the massive constructions(e.g.construction of roads,highways,buildings)associated with the great dam project at Three Gorges of Yangtze River.Ficus microcarpa L.and F virens Ait.var.sublanceolata(Miq.)Cornor(Moraceae)are chosen and widely planted in this region as ornamental trees and/or shade trees due to their shapely crowns and ability of growing on soils with low fertility.Vegetative multiplication,which uses branch cuttings to cultivate saplings,is the main way for tree propagation of the two species in Three Gorges reservoir region.Obtaining branch cuttings causes the damage of tree crown and probably affects the growth of trees.In this study,the shoot production pattern of two Ficus tree species following crown damage,which is crucial to the regrowth of trees,was investigated.Data from a crown damage experiment with two damage seasons and a series of damage intensities were analyzed.It was shown that crown damage,regardless of damage intensity and damage season,had no effect on the shoot production of lateral branches of both species.However,the shoot production on the main stem was position-dependent in both F.microcarpa and F.virens trees.Crown damage,conducted either in spring or in autumn,did not affect the number and density of new shoots on the newly grown upper stem parts and the branched stem parts within the residual crown,but facilitated the shoot production on the bare stem parts beneath the residual crown in terms of both shoot number and density.Shoot production on the bare stem parts increased with damage intensity.In addition,it was found that damage in autumn led to a stronger emergence of shoots from the bare stem parts than spring damage.Some mechanisms which could be involved in these results are discussed.Based on the experimental results,it is suggested that among all investigated variables,only the enhanced shoot production on the bare stem parts may increase the biomass partitioning to leaves and benefit the regrowth of damaged trees.展开更多
基金Supported by the Major Program for the West Action Projects of the Knowledge Innovation Program of the Chinese Academy of Sciences(KZCX2-XB2-08)the Science-Technology Foundation of Zealquest(ZQFD200705)~~
文摘[Objective] This study was to determine the response of Ficus microcarpa L. foliage to polyethylene glycol （PEG） simulated water stress using chlorophyll fluo- rescence imaging technique. [Method] The responses of detached leaves from Ficus microcarpa, Ficus benjamina and Nerium oleander to PEG-6000 simulated water stress were detected, and the chlorophyll fluorescence imaging technique was used to detect and analyze the stress at different spots of a single leaf simultaneously. [Result] The responses of Ficus microcarpa, Ficus benjamina and Nerium oleander to dehydration showed that： ~1~） the maximal photochemical efficiency （Fv/Fm） and non- photo-chemical quenching （NPQ） values were small in the reaction center among different detected spots of leaves, and there were great differences between relative electron transport rate （ETR）, photochemical quenching （qP） and quantum efficiency of PSII photochemistry （（φPSII）; （2） the differences of these parameters were more ob- vious among different spots of water-stressed leaves; （3） the discrete degrees of the species with strong resitances decreased significantly. [Conclusion] This study lays the foundation for the further research on the response of plants to drought stress using chlorophyll fluorescence imaging technique.
基金the Department of Science & Technology of Shandong Province(No.2007BS02005)the Visiting Project of the Department of Education of Shandong Province,China(2008)for financial support.
文摘A new flavonoid with chalcone skeleton was isolated from the dried aerial roots of Ficus microcarpa. The structure of the compound was elucidated on the basis of spectral methods including 1D and 2D NMR. The new compound showed weak inhibitory effect on nitric oxide production and cytotoxicity against K562 and PC3 cells.
文摘In Three Gorges reservoir region,a great many of trees are needed for vegetation restoration and land greening following the massive constructions(e.g.construction of roads,highways,buildings)associated with the great dam project at Three Gorges of Yangtze River.Ficus microcarpa L.and F virens Ait.var.sublanceolata(Miq.)Cornor(Moraceae)are chosen and widely planted in this region as ornamental trees and/or shade trees due to their shapely crowns and ability of growing on soils with low fertility.Vegetative multiplication,which uses branch cuttings to cultivate saplings,is the main way for tree propagation of the two species in Three Gorges reservoir region.Obtaining branch cuttings causes the damage of tree crown and probably affects the growth of trees.In this study,the shoot production pattern of two Ficus tree species following crown damage,which is crucial to the regrowth of trees,was investigated.Data from a crown damage experiment with two damage seasons and a series of damage intensities were analyzed.It was shown that crown damage,regardless of damage intensity and damage season,had no effect on the shoot production of lateral branches of both species.However,the shoot production on the main stem was position-dependent in both F.microcarpa and F.virens trees.Crown damage,conducted either in spring or in autumn,did not affect the number and density of new shoots on the newly grown upper stem parts and the branched stem parts within the residual crown,but facilitated the shoot production on the bare stem parts beneath the residual crown in terms of both shoot number and density.Shoot production on the bare stem parts increased with damage intensity.In addition,it was found that damage in autumn led to a stronger emergence of shoots from the bare stem parts than spring damage.Some mechanisms which could be involved in these results are discussed.Based on the experimental results,it is suggested that among all investigated variables,only the enhanced shoot production on the bare stem parts may increase the biomass partitioning to leaves and benefit the regrowth of damaged trees.
