Characterisation of ten commercial sorghum genotypes grown under water-limited conditions for bioenergy production in Mediterranean environment

  • Alessandra Fracasso | alessandra.fracasso@unicatt.it Department of Sustainable Crop Production, Università Cattolica del Sacro Cuore, Piacenza, Italy. http://orcid.org/0000-0002-6401-671X
  • Alessia Perego Department of Agricultural and Environmental Sciences, University of Milan, Milan, Italy.
  • Stefano Amaducci Department of Sustainable Crop Production, Università Cattolica del Sacro Cuore, Piacenza, Italy.

Abstract

The evaluation of commercial hybrids under limited water availability is of primary importance to assess Sorghum bicolor (Moench) as potential multipurpose bioenergy crop in Mediterranean drought prone environments. Ten genotypes were grown during three growing seasons (2010, 2011 and 2012) in open field trials and in pot experiments (2014). Phenological traits, biomass production, fibre content and biomass chemical composition were measured under irrigated and rainfed conditions. Differences in biomass production among the ten genotypes varied across years. In a three-year experiment significant differences were found among the ten genotypes in terms of duration of vegetative growth (P<0.05) and aboveground dry biomass production (P<0.1) in response to irrigated and rainfed conditions. Among the ten genotypes analysed, the hybrid ABF306 stands for its performance in terms of biomass production and chemical composition. In fact, it showed the lowest biomass yield reduction when grown under rainfed conditions, the highest drought tolerance index (=0.9), a °Brix value comparable to that of sweet sorghum genotypes (8.8 °Brix under rainfed conditions), lignin content that was not statistically influenced by water availability, and a lignin cellulose ratio (0.087) favourable for biogas production. The shoot transpiration efficiency and the total transpiration efficiency recorded at high (Exp1) and low (Exp2) vapour pressure deficit were comparable, and sometimes higher, to that of commercial sorghum hybrids. All these characteristics make ABF306 a suitable candidate for bioenergy production in Mediterranean drought prone environments.

Downloads

Download data is not yet available.
Published
2017-12-11
Section
Original Articles
Keywords:
Biomass chemical composition, Bioenergy production, Biomass production, Sorghum, Transpiration efficiency
Statistics
Abstract views: 669

PDF: 453
HTML: 346
Share it

PlumX Metrics

PlumX Metrics provide insights into the ways people interact with individual pieces of research output (articles, conference proceedings, book chapters, and many more) in the online environment. Examples include, when research is mentioned in the news or is tweeted about. Collectively known as PlumX Metrics, these metrics are divided into five categories to help make sense of the huge amounts of data involved and to enable analysis by comparing like with like.

How to Cite
Fracasso, A., Perego, A., & Amaducci, S. (2017). Characterisation of ten commercial sorghum genotypes grown under water-limited conditions for bioenergy production in Mediterranean environment. Italian Journal of Agronomy, 12(4). https://doi.org/10.4081/ija.2017.898