Cultivar X environment interactions in switchgrass
Cultivar X environment interactions in switchgrass
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DOI：
10.2135/cropsci2003.2226
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发表时间：
2003-11-01
期刊：
影响因子：
2.3
通讯作者：
Boe, AR
中科院分区：
文献类型：
--
作者：
Casler, MD;Boe, AR
柳枝草(Panicum virgatum L.)是一种广泛适应的暖季多年生植物，具有作为生物能源原料的潜力。本研究的目的是评估采收期对美国中北部两个地点柳枝条品种的影响，并确定品种X环境互作对柳枝条农艺性状和生物燃料性状的相对重要性。在威斯康星州南部和南达科他州东部种植了6个柳枝柳品种，种植时间为4年，每年在三个采收期(8月、9月和10月)收获。不同品种的生物量差异很大，但与所有环境因子存在交互作用。生物量产量对采收期的反应不一致，不同品种、地点和年份不同。尽管有这些交互作用，生物量产量的品种排名在不同的收获日期和年份是一致的，但不是地点。无论是威斯康星州还是南达科他州，都有一些优先适应的现象，这与原始种质采集点的经度有关，这也反映在地面覆盖数据中。较晚年份8月收获日期的林分和生物量产量减少表明，从长远来看，将收获推迟到夏末或秋初可能是有益的。平均干物质、饲料纤维和木质素浓度在不同品种之间也不同，在不同的地点和年份一致。这三个性状均随采收时间的延长而增加，但在不同地区和年份间差异不显著。通过选育，可以培育出纤维含量高、木质素和灰分含量低、可发酵糖利用率高、不能发酵和/或不燃烧残留物少的柳枝条种质。
Switchgrass (Panicum virgatum L.) is a widely adapted warm-season perennial that has potential as a bioenergy feedstock. The objectives of this study were to estimate the effect of harvest date on switchgrass cultivars at two locations in the north central USA and to determine the relative importance of cultivar X environment interactions for agronomic and biofuel traits of switchgrass. Six switchgrass cultivars were grown in southern Wisconsin and eastern South Dakota for 4 yr and harvested each year at three harvest dates (August, September, and October). Cultivars differed widely in biomass yield, but interacted with all environmental factors. Biomass yield did not respond consistently to harvest date, varying with cultivar, location, and year. Despite these interactions, cultivar rankings for biomass yield was consistent across harvest dates and years, but not locations. There was some preferential adaptation to either Wisconsin or South Dakota, related to longitude of the original germplasm collection site, also reflected by ground cover data. Reduced stands and biomass yields for the August harvest date in later years suggested that harvests delayed to late summer or early autumn may be beneficial in the long term. Mean dry matter, forage fiber, and lignin concentrations also varied among cultivars, consistently across locations and years. These three traits all increased with later harvest consistently across locations and years, but inconsistently among cultivars. It should be possible, through selection and breeding, to develop switchgrass germplasm with increased fiber and decreased lignin and ash, increasing the availability of fermentable sugars and decreasing the unfermentable and/or incombustible residues.