Konnerup Dennis, Malik A L Imran, Islam A K M R, Colmer Timothy David
School of Plant Biology and Institute of Agriculture, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
School of Agriculture, Food and Wine, The University of Adelaide, Waite Campus, Glen Osmond, SA 5064, Australia.
Funct Plant Biol. 2017 Apr;44(4):400-409. doi: 10.1071/FP16272.
Hordeum marinum Huds. is a waterlogging-tolerant wild relative of wheat (Triticum aestivum L.). Greater root porosity (gas volume per root volume) and formation of a barrier to reduce root radial O2 loss (ROL) contribute to the waterlogging tolerance of H. marinum and these traits are evident in some H. marinum-wheat amphiploids. We evaluated root porosity, ROL patterns and tolerance to hypoxic stagnant conditions for 10 various H. marinum (two accessions) disomic chromosome addition (DA) lines in wheat (two varieties), produced from two H. marinum-wheat amphiploids and their recurrent wheat parents. None of the DA lines had a barrier to ROL or higher root porosity than the wheat parents. Lack of a root ROL barrier in the six DA lines for H. marinum accession H21 in Chinese Spring (CS) wheat indicates that the gene(s) for this trait do not reside on one of these six chromosomes; unfortunately, chromosome 3 of H. marinum has not been isolated in CS. Unlike the H21-CS amphiploid, which formed a partial ROL barrier in roots, the H90-Westonia amphiploid and the four derived DA lines available did not. The unaltered root aeration traits in the available DA lines challenge the strategy of using H. marinum as a donor of these traits to wheat.
滨海大麦（Hordeum marinum Huds.）是小麦（Triticum aestivum L.）的一种耐涝野生近缘种。更大的根孔隙率（单位根体积的气体体积）以及形成减少根系径向氧气损失（ROL）的屏障有助于滨海大麦的耐涝性，并且这些性状在一些滨海大麦 - 小麦双二倍体中很明显。我们评估了由两个滨海大麦 - 小麦双二倍体及其轮回小麦亲本产生的、在小麦（两个品种）中的10个不同的滨海大麦（两个种质）二体染色体附加（DA）系的根孔隙率、ROL模式以及对低氧停滞条件的耐受性。没有一个DA系具有ROL屏障或比小麦亲本更高的根孔隙率。在中国春小麦（CS）中，六个滨海大麦种质H21的DA系缺乏根系ROL屏障，这表明控制该性状的基因不在这六条染色体中的任何一条上；不幸的是，滨海大麦的3号染色体尚未在中国春小麦中分离出来。与在根中形成部分ROL屏障的H21 - CS双二倍体不同，H90 - 韦斯托尼亚双二倍体和四个可用的衍生DA系没有形成该屏障。现有DA系中未改变的根系通气性状对将滨海大麦作为这些性状的供体用于小麦的策略提出了挑战。
