[Objective] This study aimed to explore the heterogeneity of chlorophyll flu- orescence of Phyllostachys edulis cv. Pachyloen leaves. [Method] Using the chloro- phyll fluorescence system and fluorescence imaging syste...[Objective] This study aimed to explore the heterogeneity of chlorophyll flu- orescence of Phyllostachys edulis cv. Pachyloen leaves. [Method] Using the chloro- phyll fluorescence system and fluorescence imaging system in the Mini-IMAGING- PAM, the chlorophyll fluorescence of Phyllostachys edulis cv. Pachyloen leaves were measured and the fluorescence parameters were calculated. [Result] The homo- geneities of the maximal quantum yield of PS II （Fv/Fm） and the leaf absorptivity （Abs） were higher, with CVs （Coefficient of Variation） of 1.58%-1.68% and 1.75%- 2.12% respectively, while the heterogeneities of the actual quantum yield （Y）, non- photochemical quenching （NPQ/4）, photochemical quenching（qP） and relative photo- synthetic rate （PS/50） were higher, with CVs of 9.60%-14.23%, 10.23%-13.02%, 11.92%-13.02% and 11.15%-17.74% respectively. The trends of heterogeneity change in Y, qP and PSI50 were basically the same with transversely higher het- erogeneity at two sides and lower heterogeneity in the middle, namely with larger CVs at the edges of leaves and smaller ones around the midrib. Longitudinally, the coefficients of variation of Y, qP and PS/50 decreased gradually （from top to bot- tom）, which indicated that the heterogeneity declined from the leaf tip to the base. The trends of heterogeneity change in PS/50 and NPQ/4 were opposite. [Conclusion] The fluorescence parameters of Phyllostachys edulis cv. Pachyloen leaves revealed different heterogeneity.展开更多
The seasonal photosynthetic response of Phyllostachys edulis ’Pachyloen’ to light intensity,CO2 concentration,temperature and humidity were measured with Li-6400P.The main study results were as follows:The seasonal ...The seasonal photosynthetic response of Phyllostachys edulis ’Pachyloen’ to light intensity,CO2 concentration,temperature and humidity were measured with Li-6400P.The main study results were as follows:The seasonal photosynthetic variation tendency of Ph.edulis ’Pachyloen’ to light intensity was summer>autumn>winter>spring for Pmax,spring>autumn>winter>summer for LCP,autumn>summer>winter>spring for LSP,and summer> autumn>winter>spring for AQY.The seasonal photosynthetic variation tendency of Ph.edulis ’Pachyloen’ to CO2 concentration was spring>autumn>summer> winter for LCP and CCP,and summer>autumn> winter>spring for CE.The optimal temperature for photosynthesis of Ph.edulis ’Pachyloen’ ranged from 20 to 30 ℃,equivalent in spring and autumn,higher in summer and lowest in winter.The optimal humidity for photosynthesis of Ph.edulis ’Pachyloen’ ranged from 40% to 65%,its seasonal variation tendency was autumn>summer>winter>spring.As a cultivar of Ph.edulis,the characteristics of photosynthetic responses of Ph.edulis ’Pachyloen’ to environmental factors were similar with Ph.edulis.It indicated their close phylogenetic relationships.展开更多
The diurnal variation of photosynthesis of Phyllostachys edulis cv.pachyloen was studied by LI-6400,as well as those of photosynthetic photon flux density(PPED),CO2 concentration in air(Ca),relative humidity(RH) and a...The diurnal variation of photosynthesis of Phyllostachys edulis cv.pachyloen was studied by LI-6400,as well as those of photosynthetic photon flux density(PPED),CO2 concentration in air(Ca),relative humidity(RH) and air temperature(Tair) were measured,and the relationships between the diurnal of Pn,Tr and climatic factors were analyzed by correlation coefficient path coefficient and decision coefficient analysis.The results were as follows:in the typical spring sunny days under natural conditions,the curve of net photosynthetic rate(Pn) had one peaks,and the peak value was 9.06 μmol·m-2·s-1,which occurred at 11:00 o’clock in the morning.The curve of diurnal variation of transpiration rate was also one-peaked,but the peak value appeared at 13:00,which was 4.95 mmol·m-2·s-1 or so.For the characteristics of photosynthesis and transpiration,PPED was the primary determining factor,and RH,Ca,and Tair affected Pn,Tr indirectly by acting on PPED.展开更多
基金Supported by the Special Fund for Basic Research of International Center for Bamboo and Rattan(1632011005)~~
文摘[Objective] This study aimed to explore the heterogeneity of chlorophyll flu- orescence of Phyllostachys edulis cv. Pachyloen leaves. [Method] Using the chloro- phyll fluorescence system and fluorescence imaging system in the Mini-IMAGING- PAM, the chlorophyll fluorescence of Phyllostachys edulis cv. Pachyloen leaves were measured and the fluorescence parameters were calculated. [Result] The homo- geneities of the maximal quantum yield of PS II （Fv/Fm） and the leaf absorptivity （Abs） were higher, with CVs （Coefficient of Variation） of 1.58%-1.68% and 1.75%- 2.12% respectively, while the heterogeneities of the actual quantum yield （Y）, non- photochemical quenching （NPQ/4）, photochemical quenching（qP） and relative photo- synthetic rate （PS/50） were higher, with CVs of 9.60%-14.23%, 10.23%-13.02%, 11.92%-13.02% and 11.15%-17.74% respectively. The trends of heterogeneity change in Y, qP and PSI50 were basically the same with transversely higher het- erogeneity at two sides and lower heterogeneity in the middle, namely with larger CVs at the edges of leaves and smaller ones around the midrib. Longitudinally, the coefficients of variation of Y, qP and PS/50 decreased gradually （from top to bot- tom）, which indicated that the heterogeneity declined from the leaf tip to the base. The trends of heterogeneity change in PS/50 and NPQ/4 were opposite. [Conclusion] The fluorescence parameters of Phyllostachys edulis cv. Pachyloen leaves revealed different heterogeneity.
文摘The seasonal photosynthetic response of Phyllostachys edulis ’Pachyloen’ to light intensity,CO2 concentration,temperature and humidity were measured with Li-6400P.The main study results were as follows:The seasonal photosynthetic variation tendency of Ph.edulis ’Pachyloen’ to light intensity was summer>autumn>winter>spring for Pmax,spring>autumn>winter>summer for LCP,autumn>summer>winter>spring for LSP,and summer> autumn>winter>spring for AQY.The seasonal photosynthetic variation tendency of Ph.edulis ’Pachyloen’ to CO2 concentration was spring>autumn>summer> winter for LCP and CCP,and summer>autumn> winter>spring for CE.The optimal temperature for photosynthesis of Ph.edulis ’Pachyloen’ ranged from 20 to 30 ℃,equivalent in spring and autumn,higher in summer and lowest in winter.The optimal humidity for photosynthesis of Ph.edulis ’Pachyloen’ ranged from 40% to 65%,its seasonal variation tendency was autumn>summer>winter>spring.As a cultivar of Ph.edulis,the characteristics of photosynthetic responses of Ph.edulis ’Pachyloen’ to environmental factors were similar with Ph.edulis.It indicated their close phylogenetic relationships.
文摘The diurnal variation of photosynthesis of Phyllostachys edulis cv.pachyloen was studied by LI-6400,as well as those of photosynthetic photon flux density(PPED),CO2 concentration in air(Ca),relative humidity(RH) and air temperature(Tair) were measured,and the relationships between the diurnal of Pn,Tr and climatic factors were analyzed by correlation coefficient path coefficient and decision coefficient analysis.The results were as follows:in the typical spring sunny days under natural conditions,the curve of net photosynthetic rate(Pn) had one peaks,and the peak value was 9.06 μmol·m-2·s-1,which occurred at 11:00 o’clock in the morning.The curve of diurnal variation of transpiration rate was also one-peaked,but the peak value appeared at 13:00,which was 4.95 mmol·m-2·s-1 or so.For the characteristics of photosynthesis and transpiration,PPED was the primary determining factor,and RH,Ca,and Tair affected Pn,Tr indirectly by acting on PPED.
