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Studies on Steady and Dynamic Characteristics of Carbon Assimilation and Photosystem Ⅱ in Eggplant

Author: XueZhanJun
Tutor: GaoZhiKui
School: Agricultural University of Hebei
Course: Olericulture
Keywords: eggplant CO2 step change dynamic photosynthesis photosystemⅡ chlorophyll fluorescence
CLC: S641.1
Type: Master's thesis
Year: 2009
Downloads: 53
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Abstract


Wherever the plants are cultivated, such as in the field or greenhouse, it always take place that the step change of photosynthetic active radiation （PAR） which due to the shade of cloud, person, object and move of spot in plant population or the step change of CO2 concentration which due to the breath of people, flow of gas, fertilization of CO2, which significantly affects the photosynthesis. Firstly, the photosynthetic characteristics of eggplant were measured with CIRAS-2. Secendly, the dynamic course of photosynthesis was obtained with recustructive CIRAS-2 under complex treatment of saturated or semi-saturated PAR and CO2 step change, meanwhile, the kinetic parameter of chlorophyll fluorescence was determined with self-designedly coupling test system which was composed of fluorometer probe and photosynthetic leaf chamber in the dynamic course of photosynthesis. The results indicated that:1 The light compensation point（LCP）, light saturation point（LSP）, and apparent quantum yield（AQY） of eggplant were 123.05, 1400μmol photons·m-2·s-1 and 0.031 CO2·photon-1 under CO2 concentration (380μmol·mol-1) and optimum temperature（30℃）, respectively. The CO2 compensation point（CCP）, CO2 saturation point（CSP）, and carboxylation effieieney（CE） were 70, 920μmol·mol-1 and 0.1045μmol?m-2?s-1 under saturated PAR and optimum temperature（30℃）, respectively.2 According to the analysis of CO2 response curves（Pn-CO2）, the dark respiration in light（Rd）, maximal carboxylation rate（Vcmax）, CO2 compensation point in absence of Rd（Γ*）, maximal electron transport rate（Jmax） and rate of triose-phosphate utilization（TPU） were 1.55, 90.45μmolCO2·m-2·s-1, 54.45μmol·mol-1, 207.31μmol electrons·m-2·s-1 and 13.51μmol·m-2·s-1 in the FvCB model, respectively. The resistances of leaf boundary layer（ra）, resistances of stomate（rs）, transport resistance in liquid phase of mesophyll cell（rmd） and carboxylation resistances（rc） were 6.3, 5.0, 3.4 and 5.3bar(mol·m-2·s-1)-1 in the laisk model, respectively. The rs increased to 8.0bar(mol·m-2·s-1)-1 when PAR reduced from 1500 to 890μmol photons·m-2·s-1.3 The oscillational phenomenon of net photosynthetic rate（Pn） and electron transport rate （Jf） was discovered in dynamic course under saturated PAR and optimum temperature（30℃） when CO2 step change was bigger from 7.3 to 1400μmol·mol-1. However, the oscillational phenomenon didn’t appear when CO2 step change was smaller from 7.3 to 640μmol·mol-1 under saturated PAR or when CO2 step change was shifted from 8.1 to 1645μmol·mol-1 or 700μmol·mol-1under semi-saturated PAR. The respone time of Jf was earlier than that of Pn in the dynamic course and the ahead of time was about 20s. The Pn remarkedly reduced, but the Jf didn’t change significantly when PAR decreased, which showed that the needed PAR of maximal Pn was bigger than that of Jf. The oscillational phenomenon is limited by regeneration of RuBP, while the non-oscillational phenomenon is limited by the amounts and activity of Rubisco.4 The dynamic course of energy and flux parameters has good consistency with the dynamic photosynthsetic course, only the response time of former was earlier than that of latter and the ahead of response time was about 10-20s. The oscillational phenomenon emerged on real trapped energy flux per reaction center（TR/RC） under saturated PAR and bigger CO2 step change, besides others energy and flux parameters. The TR/RC and real electron transport flux per reaction center（ET/RC） had no significant change, but the real dissipated energy flux per reaction center（DI/RC） extremely dramatically decreased when the PAR reduced from 1500 to 890μmol photons·m-2·s-1, which showed that the mechanism of energy dissipation played a important role in protecting photosynthetic apparatus under saturated PAR.

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CLC: > Agricultural Sciences > Gardening > Vegetable gardening > Solanaceous > Eggplant
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