Hull to caryopsis adhesion and grain skinning in malting barley: Identification of key growth stages in the adhesion process
Hull to caryopsis adhesion and grain skinning in malting barley: Identification of key growth stages in the adhesion process
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DOI：
10.1016/j.jcs.2015.10.007
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发表时间：
2016-03-01
影响因子：
3.8
通讯作者：
Cochrane, Patricia M.
中科院分区：
文献类型：
--
作者：
Hoad, Stephen P.;Brennan, Maree;Cochrane, Patricia M.
船体和颖果之间的强粘附力是大麦具有良好的制麦品质所必需的。差的船体粘附性，一种称为谷物结皮的状况，对于麦芽制造和下游工艺是不期望的。目前，对船体附着力在晶粒发育过程中的调节过程了解甚少。大麦栽培品种Chariot在温室条件下生长，并在限定的生长阶段记录谷粒发育以检查船体粘附的时间。开始粘附时，首先观察到颖果鲜重和体积接近其最大值在开花后19天，在早期面团。花后27天船体粘附完成，或软面团。使用光学和透射电子显微镜观察发育中的谷物的切片，以检查被认为是负责船体和果皮之间的粘附的富含脂质的胶结层。果胶酶和纤维素酶均不影响船体松动，这一观察结果支持了富含脂质的胶结材料的证据。谷物生长，来自果皮和电子致密材料的胶结层中的球状物质的存在下进行了讨论有关船体粘附。谷粒结皮可能是由于角质层物质的粘附性差或角质层之间的融合不充分造成的。(C)2015爱思唯尔有限公司版权所有。
Strong adhesion between the hull and the caryopsis is essential for barley to be of good malting quality. Poor hull adhesion, a condition known as grain skinning, is undesirable for malting and downstream processes. At present, the processes mediating hull adhesion during grain development are poorly understood. The barley cultivar Chariot was grown in greenhouse conditions and grain development was recorded at defined growth stages to examine the timing of hull adhesion. Initiation of adhesion was first observed when caryopsis fresh weight and volume were approaching their maximum at 19 days after anthesis, during early dough. Hull adhesion was complete by 27 days after anthesis, or soft dough. Sections of developing grains were observed using light and transmission electron microscopy to examine a lipid-rich cementing layer believed to be responsible for adhesion between the hull and the pericarp. Evidence for a lipid-rich cementing material was supported by the observation that neither pectinase nor cellulase effected hull loosening. Grain growth, the presence of globular material originating from the pericarp and an electron dense material in the cementing layer are discussed in relation to hull adhesion. Grain skinning could be caused by poor adherence of cuticular material or inadequate fusion between cuticles. (C) 2015 Elsevier Ltd. All rights reserved.