Genetic Variation for Biomass Yield and Predicted Genetic Gain in Lowland Switchgrass “Kanlow”

Agronomy

Haileab Hilafu¹  Vince Pantalone²  Virginia Sykes²  Santosh Nayak²  Hem Bhandari²  Scott Senseman²  Carl Sams²  Cheryl Dalid² 

[1] Department of Business Analytics and Statistics, The University of Tennessee, 916 Volunteer Boulevard, Knoxville, TN 37996, USA;Department of Plant Sciences, University of Tennessee, 2505 E J Chapman Drive, Knoxville, TN 37996, USA;

关键词: biomass yield;    genetic gain;    genetic variation;    half-sib;    narrow sense heritability;    switchgrass (Panicum virgatum L.);   

DOI  :  10.3390/agronomy10121845

来源: DOAJ

【 摘 要 】

Switchgrass (Panicum virgatum L.) is a warm-season, perennial grass valued as a promising candidate species for bioenergy feedstock production. Biomass yield is the most important trait for any bioenergy feedstock. This study was focused on understanding the genetics underlying biomass yield and feedstock quality traits in a “Kanlow” population. The objectives of this study were to (i) assess genetic variation (ii) estimate the narrow sense heritability, and (iii) predict genetic gain per cycle of selection for biomass yield and the components of lignocelluloses. Fifty-four Kanlow half-sib (KHS) families along with Kanlow check were planted in a randomized complete block design with three replications at two locations in Tennessee: Knoxville and Crossville. The data were recorded for two consecutive years: 2013 and 2014. The result showed a significant genetic variation for biomass yield (p < 0.05), hemicellulose concentration (p < 0.05), and lignin concentration (p < 0.01). The narrow sense heritability estimates for biomass yield was very low (0.10), indicating a possible challenge to improve this trait. A genetic gain of 16.5% is predicted for biomass yield in each cycle of selection by recombining parental clones of 10% of superior progenies.

【 授权许可】

Unknown