Tolerance of switchgrass to extreme soil moisture stress: Ecological implications
Tolerance of switchgrass to extreme soil moisture stress: Ecological implications
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DOI：
10.1016/j.plantsci.2009.09.003
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发表时间：
2009-12-01
期刊：
影响因子：
5.2
通讯作者：
DiTomaso, Joseph M.
中科院分区：
文献类型：
--
作者：
Barney, Jacob N.;Mann, J. Jeremiah;DiTomaso, Joseph M.
柳枝稷（Panicum virgatum L）原产于北美东部和中部，由于其广泛的适应性、快速的生长速度和在低产土壤中生长的能力，在美国是专用生物燃料原料的主要候选者。为了开始表征柳枝稷的环境耐受性相关的重要农艺和生态性状，我们评估了在胁迫生长条件下的适应性。我们评估了四个常见的加入，无论是高地和低地生态型，在不同水平的土壤水分供应（水分赤字淹没）在温室中的发芽，建立，性能和繁殖潜力。在所有土壤水分条件下（-0.3 MPa至淹水），种子发芽并定植（55-90%存活）。低地生态型的移植表现以及在淹水条件下，在田间容量控制，虽然洪水降低了性能的高地生态型。干旱处理（-4.0和-11.0 MPa）减少分蘖长度和数量，叶面积和生物量生产高达80%。然而，一旦建立，所有植物在-4.0 MPa下存活，并且在花中具有与田间容量相同的分蘖比例。柳枝稷在低湿度和淹水条件下发芽、建立和开花的能力，特别是低地生态型，可能会增加适合生物燃料种植的环境范围，并可作为进一步生态研究和遗传改良的基线。(C)2009爱思唯尔爱尔兰有限公司保留所有权利。
Switchgrass (Panicum virgatum L), a native of eastern and central North America, is a leading candidate as a dedicated biofuel feedstock in the US due to its broad adaptability, rapid growth rate, and ability to grow in low production soils. To begin to characterize the important agronomic and ecological traits related to environmental tolerance of switchgrass, we evaluated fitness under stressful growing conditions. We assessed the germination, establishment, performance, and reproductive potential of four common accessions, both upland and lowland ecotypes, at various levels of soil moisture availability (moisture deficit to flooded) in the greenhouse. Seeds emerged and established (55-90% survival) under all soil moisture conditions (-0.3 MPa to flooded). Transplants of lowland ecotypes performed as well in flooded conditions as in field capacity controls, though flooding reduced performance of upland ecotypes. Drought treatments (-4.0 and -11.0 MPa) reduced tiller length and number, leaf area, and biomass production by up to 80%. However, once established, all plants survived at -4.0 MPa and had the same proportion of tillers in flower as at field capacity. The ability of switchgrass to germinate, establish, and flower in low moisture and flooded conditions, particularly lowland ecotypes, may increase the range of environments suitable for biofuel cultivation, and can serve as a baseline for further ecological studies and genetic improvement. (C) 2009 Elsevier Ireland Ltd. All rights reserved.