Specific weight of barley grains is determined by traits affecting packing efficiency and by grain density
Specific weight of barley grains is determined by traits affecting packing efficiency and by grain density
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DOI：
10.1002/jsfa.9465
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发表时间：
2019-03-30
影响因子：
4.1
通讯作者：
Hoad, Steve
中科院分区：
文献类型：
--
作者：
Hoyle, Aaron;Brennan, Maree;Hoad, Steve
比重影响大麦籽粒的市场价值，在酿造大麦中，高比重被认为会导致麦芽产量增加。然而，比重和麦芽产量之间的联系尚未确定。我们假设，包装效率和颗粒密度将各自有助于比重量。这些性状将对麦芽加工过程产生影响，强调在我们能够预测其对麦芽生产性能和效率的影响之前，需要了解哪些谷物性状对比重有贡献。结果：比重是籽粒密度和包装效率的乘积，在我们的研究中，比重变化的贡献率分别为48.5%和36.5%。我们报告了堆积效率是由颗粒尺寸决定的，并与颗粒长度和深度的总和负相关。因此，更短、更细的颗粒会导致比重的增加，这可能对麦芽的性能有害。结果表明，在籽粒大小性状差异较大的品种中，不同的籽粒密度可以获得相同的比重。结论：为了优化比重，必须同时考虑籽粒尺寸和籽粒密度，并且在如何实现高比重时，需要仔细考虑比重与麦芽性能和效率之间的关系。(c) 2018年化学工业学会
BACKGROUND Specific weight influences the market value of barley grain, and in malting barley a high specific weight is thought to result in an increased malt output. However, links between specific weight and malt output have not yet been established. We hypothesised that packing efficiency and grain density will each contribute to specific weight. These traits would have implications for the malting process, highlighting the need for understanding what grain traits contribute to specific weight, before we can predict its effect on malting performance and efficiency. RESULTS We report that specific weight is a product of grain density and packing efficiency, in our study proportionally contributing 48.5% and 36.5% to variation in specific weight, respectively. We report that packing efficiency is determined by grain dimensions, and is negatively correlated with the sum of grain length and depth. Therefore shorter, thinner grains can result in an increased specific weight, which is likely to be detrimental for malting performance. We also demonstrate that among cultivars which have grains with contrasting size traits, the same specific weight can be achieved through differing grain densities. CONCLUSIONS Our results demonstrate that both grain dimensions and grain density must be considered jointly to optimise specific weight, and that the relationship between specific weight and malting performance and efficiency needs to be carefully considered with respect to how a high specific weight is achieved. (c) 2018 Society of Chemical Industry