Effects of Different Genotypes of Switchgrass as a Bioenergy Crop on Yield Components and Bioconversion Potential

可持续生物质能源系统(英文) Pub Date : 2017-02-13 DOI:10.4236/JSBS.2017.71003

D. Min, Y. Guragain, Vara Prasad, P. Vadlani, Jung-Eun Lee

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引用次数: 7

Abstract

Switchgrass (Panicum virgatum L.) is a native warm-season grass and it is one of potential bioenergy crops. The objectives of this study were to: 1) assess the best performing switchgrass genotype suitable for Kansas soil and climatic condition in the USA, 2) determine the correlation between plant height or tiller numbers per plant and dry biomass of various switchgrass genotypes, and 3) assess a bioconversion efficiency of certain varieties of switchgrass. Twenty-two different genotypes of seedlings were allowed to grow in cones for 30 days under controlled environments. The genotype Cave-in-Rock was the shortest among the genotypes. Significant difference in number of tillers per plant was observed among the genotypes. The genotypes Alamo recorded the highest numbers of tiller plant-1 and the genotype Cave-in-Rock had the lowest numbers of tiller plant-1 compared with other genotypes. The genotypes Alamo, NL 94 C2-2, NL 94 C2-3, NSL 2009-1 and NSL 2009-2 had increased above ground biomass compared with other genotypes. The correlation study indicates that there was a significant positive correlation between number of tillers per plant and per plant dry weight (R2 = 0.93), number of tillers per plant and plant height (R2 = 0.94), and plant height and per plant dry weight (R2 = 0.82). Based on the biomass composition, the SWG 2007-2 genotype was the promising switchgrass line for the bioconversion through the sugar platform route due to high carbohydrate and low lignin content. On the other hand, the high biomass yield per unit area of field in NL 94 C2-1 led this genotype with the highest total carbohydrate yield per unit area of field despite the lowest total carbohydrate content in the genotype. These results are pertinent for crop breeders to develop the most promising switchgrass line with high biomass yield and high bioconversion efficiency to produce biofuel through the sugar platform route.

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不同基因型柳枝稷生物能源作物对产量构成及生物转化潜力的影响

柳枝稷(Panicum virgatum L.)是一种土生土长的暖季草，是潜在的生物能源作物之一。本研究的目的是:1)评估适合美国堪萨斯州土壤和气候条件的表现最好的柳枝稷基因型;2)确定不同柳枝稷基因型株高或单株分蘖数与干生物量的相关性;3)评估某些品种柳枝稷的生物转化效率。在受控环境下，22种不同基因型的幼苗在球果中生长30天。岩洞基因型最短。不同基因型的单株分蘖数差异显著。与其他基因型相比，“阿拉莫”基因型分蘖株数最多，“岩洞”基因型分蘖株数最少。与其他基因型相比，Alamo、NL 94 C2-2、NL 94 C2-3、NSL 2009-1和NSL 2009-2的地上生物量显著增加。相关研究表明，单株分蘖数与单株干重呈显著正相关(R2 = 0.93)，单株分蘖数与株高呈显著正相关(R2 = 0.94)，单株株高与单株干重呈显著正相关(R2 = 0.82)。基于生物量组成，SWG 2007-2基因型碳水化合物含量高，木质素含量低，是通过糖平台途径进行生物转化的理想柳枝稷品系。另一方面，NL 94 C2-1的高单位面积生物量使该基因型的单位面积总碳水化合物产量最高，但总碳水化合物含量最低。这些结果对作物育种者通过糖平台路线开发具有高生物量产量和高生物转化效率的最有前途的柳枝稷品系生产生物燃料具有指导意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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可持续生物质能源系统(英文)

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117