Legume seeds, when relay sown following rice, may suffer from soil waterlogging and the associated hypoxia or even anoxia. This study evaluated the tolerance of grain legume species, grass pea (three genotypes), lentil (two genotypes), faba bean (two genotypes) and field pea (one genotype), to soil waterlogging in a glasshouse, to anoxia and hypoxia in temperature-controlled room at germination and seedling stages. Changes in oxygen in the surface layers of soil, with time after waterlogging, were measured by microelectrode profiling. The soil profiling showed that soil oxygen declined and then stabilized by the fourth day after waterlogging and oxygen was not detected at 8 mm below the soil surface. Germination of seeds under waterlogging for up to 12 days and seedling survival after the soil was drained for up to 36 days were measured in pot experiments. Seed germination and/or survival in anoxia (N2-flushed solutions) and hypoxia (1.0 and 2.5 kPa oxygen) were evaluated, and so were post-anoxia or post-hypoxia recoveries, all in comparison with aerated controls. Lentil had higher seedling emergence (55 %) than the other species during soil waterlogging. However, lentil had lower seedling survival (9 %) than grass pea (28 %) during recovery following soil drainage. Grass pea seeds were more tolerant of anoxia and of hypoxia than the seeds of the three other species. In conclusion, grass pea, with higher percent germination and seedling survival during recovery, is more tolerant to waterlogging and subsequent soil drainage than the three other grain legume species. Grass pea was also more tolerant of hypoxia and of anoxia at the seed germination stage. These findings demonstrate the superior waterlogging tolerance of grass pea in relay sowing, as compared with the other grain legumes.

中文翻译：

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四种豆科植物萌发恢复期对涝渍、缺氧和缺氧的耐受性

豆类种子在水稻之后播种时，可能会遭受土壤涝渍和相关的缺氧甚至缺氧。本研究评估了谷物豆科植物、草豌豆（三种基因型）、小扁豆（两种基因型）、蚕豆（两种基因型）和豌豆（一种基因型）对温室土壤涝渍、温度缺氧和缺氧的耐受性- 发芽和幼苗阶段的控制室。通过微电极分析测量土壤表层中的氧气变化，以及涝渍后的时间。土壤剖面显示，土壤含氧量下降，到涝后第四天趋于稳定，土壤表面以下8毫米处未检测到氧气。在盆栽试验中测量了在涝渍下长达 12 天的种子发芽率和土壤排水长达 36 天后的幼苗存活率。与充气对照相比，评估了缺氧（N2 冲洗溶液）和缺氧（1.0 和 2.5 kPa 氧气）中的种子发芽和/或存活率，以及缺氧后或缺氧后的恢复情况。在土壤涝渍期间，小扁豆的出苗率（55%）高于其他物种。然而，在土壤排水后的恢复过程中，小扁豆的幼苗存活率 (9%) 低于草豌豆 (28%)。草豌豆种子比其他三个物种的种子更能耐受缺氧和缺氧。总之，草豌豆在恢复期间具有较高的发芽率和幼苗存活率，比其他三种谷物豆科植物更耐涝和随后的土壤排水。草豌豆在种子萌发阶段也更能耐受缺氧和缺氧。这些发现表明，与其他谷物豆科植物相比，草豌豆在接力播种中的耐涝性更高。