IFEVA, Universidad de Buenos Aires, CONICET, Facultad de Agronomía, Avenida San Martín 4453, Buenos Aires C1417DSE, Argentina; and Cátedra de Fisiología Vegetal, Departamento Biología Aplicada y Alimentos, Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires, Argentina.
IFEVA, Universidad de Buenos Aires, CONICET, Facultad de Agronomía, Avenida San Martín 4453, Buenos Aires C1417DSE, Argentina; and Cátedra de Forrajicultura, Departamento de Producción Animal, Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires, Argentina.
Funct Plant Biol. 2024 Jan;51(1):NULL. doi: 10.1071/FP23172.
Flooding significantly hampers global forage production. In flood-prone regions, Lotus tenuis and Lotus corniculatus are common forage legumes, yet little is known about their responses to partial or complete submergence. To address this, we evaluated 10 Lotus accessions subjected to 11days of either partial or complete submergence, analysing growth traits related to tolerance and recovery after de-submergence. Principal component analyses revealed that submergence associated growth parameters were linked to L. corniculatus accessions, whereas recovery was associated with L. tenuis accessions. Notably, in L. tenuis , recovery from complete submergence positively correlated with leaf mass fraction but negatively with root mass fraction, showing an opposite pattern than in L. corniculatus . Encouragingly, no trade-off was found between inherent growth capacity and submergence tolerance (both partial and complete) or recovery ability, suggesting genetic selection for increased tolerance would not compromise growth potential. L. tenuis exhibited accessions with both partial and complete submergence tolerance, making them versatile for flood-prone environments, whereas L. corniculatus accessions were better suited for partial submergence. These findings offer valuable insights to enhance forage production in flood-prone areas and guide the selection of appropriate Lotus accessions for specific flood conditions.
洪水严重阻碍了全球草料的生产。在易受洪水影响的地区， Lotus tenuis 和 Lotus corniculatus 是常见的饲料豆科植物，但对它们对部分或完全淹没的反应知之甚少。为了解决这个问题，我们评估了 10 个 Lotus 品系，这些品系分别经历了 11 天的部分或完全淹没，分析了与耐受和淹没后恢复相关的生长特性。主成分分析表明，与淹没相关的生长参数与 Lotus corniculatus 品系有关，而恢复则与 Lotus tenuis 品系有关。值得注意的是，在 Lotus tenuis 中，完全淹没后的恢复与叶片质量分数呈正相关，与根质量分数呈负相关，与 Lotus corniculatus 的模式相反。令人鼓舞的是，在固有生长能力和淹没耐受性（包括部分和完全）或恢复能力之间没有发现权衡，这表明遗传选择增加耐受性不会损害生长潜力。 Lotus tenuis 表现出对部分和完全淹没的耐受性，使它们在洪水多发环境中具有多功能性，而 Lotus corniculatus 品系更适合部分淹没。这些发现为提高洪水多发地区的草料产量提供了有价值的见解，并指导了对特定洪水条件下合适 Lotus 品系的选择。
