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vol. 14, nr. 1 (2009)
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Preliminary estimation of selected gas exchange parameters connected with photosyn-thesis in respect of yielding of energetic grasses from Miscanthus genus in the first year following planting
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Stanisław Jeżowski, Katarzyna Głowacka, Zygmunt Kaczmarek
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Institute of Plant Genetics, Polish Academy of Sciences ul. Strzeszyńska 34, 60-479 Poznań |
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vol. 14 (2009), nr. 1,
pp. 73-81
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abstract:
Presented paper is concerned with the influence of photosynthesis process under the field conditions on yielding of grasses from Miscanthus genus. Experiments were conducted in random block design in three replications and two locations. The first experiment was located in the field of the Institute of Plant Genetics, Polish Academy of Sciences, in Poznań, and the second was situated in the field of the Bioenergia Company in Elbląg. Experimental material consisted of six genotypes from the genus Miscanthus differed in yielding. The aim of the study was to evaluate the influence of selected gas exchange parameters on yielding of different Miscanthus genotypes and, additionally, to examine the genotype x environment interaction for those factors. The parameters measured were the following: photosynthesis rate (Pn), transpiration rate (E), stomatal conductance (GS), internal CO2 concentration (Ci). The set of analysed gas exchange parameters also included photosynthetic water use efficiency (WUE) and instantaneous photosynthetic water use efficiency (WUEI). The gas exchange parameters were measured using a gas exchange system (CIRAS-2). On each test plot the measurements were conducted in the middle part of the third and fourth youngest leaves of five randomly chosen plants. The results showed huge genotype-related variability of analysed genotypes in relation to gas exchange parameters, and especially to photosynthesis rate (Pn) and transpiration rate (E) with the photosynthetic water use efficiency (WUE). A significant interaction between genotype and environment was observed in relation to the examined parameters. The correlations between yield of biomass and gas exchange parameters were significant.
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keywords:
Miscanthus sinensis, Miscanthus x giganteus, biomass yield, photosynthesis gas exchange parameters, interaction genotype x environment, water use efficiency
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original in:
Polish
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