Department of Crop and Forest Sciences and AGROTECNIO (Center for Research in Agrotechnology), University of Lleida, Av. Rovira Roure, Lleida, Spain.
John Innes Centre, Norwich Research Park, Colney Lane, Norwich, UK.
J Exp Bot. 2018 Apr 27;69(10):2621-2631. doi: 10.1093/jxb/ery104.
Wheat adaptation is affected by Ppd genes, but the role of these alleles in the rates of leaf and spikelet initiation has not been properly analysed. Twelve near isogenic lines (NILs) combining Ppd-1a alleles from different donors introgressed in A, B, and/or D genomes were tested under field conditions during two growing seasons together with the wild type, Paragon. Leaf initiation rate was unaffected by Ppd-1a alleles so the final leaf number (FLN) was reduced in parallel with reductions in the duration of the vegetative phase. Spikelet primordia initiation was accelerated and consequently the effect on spikelets per spike was less than proportional to the effect on the duration of spikelet initiation. The magnitude of these effects on spikelet plastochron depended on the doses of Ppd-1 homoeoalleles and the specific insensitivity alleles carried. Double ridge was consistently later than floral initiation, but the difference between them was not affected by Ppd-1a alleles. These findings have potential for selecting the best combinations from the Ppd-1 homoeoallelic series for manipulating adaptation taking into consideration particular effects on spikelet number.
小麦的适应性受 Ppd 基因的影响，但这些等位基因在叶和小穗起始率中的作用尚未得到适当分析。在两个生长季节的田间条件下，测试了 12 个近等基因系（NIL），这些 NIL 结合了来自不同供体的 Ppd-1a 等位基因，分别导入 A、B 和/或 D 基因组，同时还测试了野生型 Paragon。Ppd-1a 等位基因对叶起始率没有影响，因此最终叶数（FLN）与营养阶段持续时间的减少成比例减少。小穗原基的起始被加速，因此对小穗数的影响小于对小穗起始持续时间的影响的比例。这些对小穗间期间隔的影响的幅度取决于 Ppd-1 同系等位基因的剂量和携带的特定不敏感等位基因。双脊比花原基的起始始终晚，但它们之间的差异不受 Ppd-1a 等位基因的影响。这些发现有可能从 Ppd-1 同系等位基因系列中选择最佳组合，用于考虑对小穗数的特定影响来操纵适应性。
