Variation in canopy duration in the perennial biofuel crop Miscanthus reveals complex associations with yield.
Variation in canopy duration in the perennial biofuel crop Miscanthus reveals complex associations with yield.
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DOI：
10.1093/jxb/ert104
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发表时间：
2013-05
影响因子：
6.9
通讯作者：
Donnison IS
中科院分区：
文献类型：
--
作者：
Robson PR;Farrar K;Gay AP;Jensen EF;Clifton-Brown JC;Donnison IS
能源作物可以提供可持续的电力和燃料来源，并减轻与化石燃料使用相关的二氧化碳排放的负面影响。芒草是一种多年生 C4 能源作物，能够产生大量生物质产量，同时需要较低的投入水平。芒草基本上没有经过改良，因此可能有很大的机会提高产量。产量的进一步增加将改善作物的经济性、能源平衡和碳减排，并减少土地占用。提高芒草产量的一种策略是通过延长树冠持续时间来最大化捕获的光线。在这项研究中，对 244 种芒草基因型的不同集合的冠层持续时间进行了比较。通过计算冠层建立和衰老之间的天数来确定冠层持续时间。产量与冠层持续时间呈正相关。较早的建立和较晚的衰老也分别与较高的产量相关。然而，虽然冠层持续时间短的基因型产量低，但并非所有冠层持续时间长的基因型都是高产的。冠层持续时间长的基因型之间的产量差异与茎和叶性状的变化有关。研究了评估冠层持续时间性状的不同方法，包括视觉评估、图像分析、光拦截和不同的性状阈值。最高的相关系数与后来的性状评估和使用量子传感器建立冠层有关。讨论了一种能够提高芒草和其他生物能源作物产量的性状优化模型。
Energy crops can provide a sustainable source of power and fuels, and mitigate the negative effects of CO2 emissions associated with fossil fuel use. Miscanthus is a perennial C4 energy crop capable of producing large biomass yields whilst requiring low levels of input. Miscanthus is largely unimproved and therefore there could be significant opportunities to increase yield. Further increases in yield will improve the economics, energy balance, and carbon mitigation of the crop, as well as reducing land-take. One strategy to increase yield in Miscanthus is to maximize the light captured through an extension of canopy duration. In this study, canopy duration was compared among a diverse collection of 244 Miscanthus genotypes. Canopy duration was determined by calculating the number of days between canopy establishment and senescence. Yield was positively correlated with canopy duration. Earlier establishment and later senescence were also both separately correlated with higher yield. However, although genotypes with short canopy durations were low yielding, not all genotypes with long canopy durations were high yielding. Differences of yield between genotypes with long canopy durations were associated with variation in stem and leaf traits. Different methodologies to assess canopy duration traits were investigated, including visual assessment, image analysis, light interception, and different trait thresholds. The highest correlation coefficients were associated with later assessments of traits and the use of quantum sensors for canopy establishment. A model for trait optimization to enable yield improvement in Miscanthus and other bioenergy crops is discussed.