Center of Plant Sciences, Scuola Superiore Sant'Anna, Pisa, Italy.
Council for Agricultural Research and Economics (CREA), Research Centre for Genomics and Bioinformatics, Fiorenzuola d'Arda, Italy.
J Exp Bot. 2023 Aug 3;74(14):4277-4289. doi: 10.1093/jxb/erad151.
Global climate change has dramatically increased flooding events, which have a strong impact on crop production. Barley (Hordeum vulgare) is one of the most important cereals and its cultivation includes a broad range of different environments. We tested the capacity to germinate of a large barley panel after a short period of submergence followed by a period of recovery. We demonstrate that sensitive barley varieties activate underwater secondary dormancy because of a lower permeability to oxygen dissolved in water. In sensitive barley accessions, secondary dormancy is removed by nitric oxide donors. The results of a genome-wide association study uncovered a Laccase gene located in a region of significant marker-trait association that is differently regulated during grain development and plays a key role in this process. Our findings will help breeders to improve the genetics of barley, thereby increasing the capacity of seeds to germinate after a short period of flooding.
全球气候变化显著增加了洪水事件的发生频率，对作物生产造成了强烈影响。大麦（Hordeum vulgare）是最重要的谷物之一，其种植范围广泛，包括多种不同的环境。我们测试了在短时间淹没后和恢复期间，大量大麦品系的发芽能力。我们证明，由于水中溶解氧的渗透率较低，敏感大麦品种会激活水下次生休眠。在敏感大麦品种中，二次休眠可通过一氧化氮供体去除。全基因组关联研究的结果揭示了一个漆酶基因，该基因位于一个具有显著标记-性状关联的区域，在谷物发育过程中受到不同的调控，在这个过程中起着关键作用。我们的研究结果将帮助培育者改善大麦的遗传特性，从而提高种子在短时间洪水后发芽的能力。
