Volume 6, Issue 3, June 2018, Page: 68-86
Photosynthesis, Resource Acquisition and Growth Responses of Two Biomass Crops Subjected to Water Stress
Elena Sánchez, Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Catalonia, Spain
Gladys Lino, Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Catalonia, Spain
Claudia Arias, Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Catalonia, Spain
Xavier Serrat, Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Catalonia, Spain
Salvador Nogués, Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Catalonia, Spain
Received: May 2, 2018;       Accepted: May 19, 2018;       Published: Jun. 25, 2018
DOI: 10.11648/j.jps.20180603.11      View  1029      Downloads  102
This study compares photosynthesis, growth, 13C and 15N labelling patterns of two biomass crops (Arundo donax L. and Panicum virgatum L.) grown under water stress in greenhouse conditions. Plants were exposed to three water stress levels: control (C, 100% Pot Capacity), mild stress (MS, 50% PC) and severe stress (SS, 25% PC). Photosynthesis, fluorescence parameters and relative water content were measured at the beginning (Ti) and the end of the experiment (Tf). Biomass parameters were measured at Tf. Short-term double labelling with 13C and 15N stable isotopes was performed in both species. Isotopic analyses of total organic matter, total soluble sugars and the CO2 respired were undertaken at T0 (pre-labelling), T1 (24h after labelling) and T2 (7 days after labelling). Immediately after the 13C and 15N labelling, stems and rhizomes seemed to be the main sinks for labelled carbon and nitrogen in both species. Moreover, not all of the labelled carbon and nitrogen substrate was used by plant metabolism after seven days. Decreases in photosynthesis parameters were observed as a consequence of the increase in water stress (WS) in both species, with a greater magnitude decline in giant reed than in switchgrass. A decrease in height, number of green leaves and total dry weight due to WS was observed in both species. Both species were more 13C-enriched and more 15N-depleted during the increases in WS due to lower stomatal conductance and transpiration. In general, WS accelerated plant phenology and, consequently, the accumulation of storage compounds in the rhizome occurred in response to stress. This effect was more clearly visible in switchgrass than in giant reed.
Arundo donax L., Panicum virgatum L., 13C and 15N Isotope Labelling, Biomass, Water Stress
To cite this article
Elena Sánchez, Gladys Lino, Claudia Arias, Xavier Serrat, Salvador Nogués, Photosynthesis, Resource Acquisition and Growth Responses of Two Biomass Crops Subjected to Water Stress, Journal of Plant Sciences. Vol. 6, No. 3, 2018, pp. 68-86. doi: 10.11648/j.jps.20180603.11
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