在玉米陆地品种中,固率和空中根产量
Layne N Connolly1, Nicola Lorenz2, Keyvan Maleki1
1Department of Horticulture and Crop Science, The Ohio State University, Columbus, OH, United States.
Frontiers in plant science
|February 12, 2025
概括
玉米土地种可以通过空中根系固定大气 (N),减少肥料需求. 这项研究发现,早期生长和空中根的发展预测了固,这种特征比以前知道的更广泛.
科学领域:
- 农业科学 农业科学
- 植物生物学 植物生物学
- 微生物学 微生物学
背景情况:
- 来自墨西哥高原的玉米 (Zea mays) 陆地品种具有分泌粘液的空中根,支持固细菌.
- 这种植物-微生物共生允许大气 (N) 固定,减少对土壤N和肥料的依赖.
- 了解影响这种特性的遗传和环境因素对于可持续农业至关重要.
研究的目的:
- 调查不同种类的玉米和营养管理 (施肥) 如何影响空中根的生长.
- 为了确定玉米可以在多大程度上从大气N2固定中发挥作用和受益.
- 探索不同种类的玉米中N固定能力的遗传变异.
主要方法:
- 在美国俄俄州 (2019-2020年) 进行了复制的实地实验,使用了21种玉米国产品种和3种改进品种.
- 应用了不同的营养管理策略 (有和没有肥料).
- 使用15N自然丰度方法测量了植物生长,空中根产量和大气N2固定率.
主要成果:
- 在玉米加入中观察到生长速度和空中根部发育的显著差异.
- 高达36%的植物来自大气N2固定,受加入,参考植物和肥料水平的影响.
- 早期生长参数和空中根节点数量与来自大气固定的N量正相关.
结论:
- 在较大的苗木中增强空中根生长可能会导致N2固定带来更大的好处.
- 固定能力比以前认为的,在玉米的土地品种中分布得更广泛.
- 在作物来源中心保存的遗传多样性具有对植物营养和可持续农业至关重要的特征.
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