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断根对水稻幼苗根系形态及水分利用效率的影响
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断根对水稻幼苗根系形态及水分利用效率的影响
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Journal Article
断根对水稻幼苗根系形态及水分利用效率的影响
2025
Overview
【目的】研究断根对水稻幼苗根系形态及提高水稻幼苗水分利用效率影响效果。【方法】以“绿旱639”水稻品种为研究对象，开展不同断根时间和不同断根强度的水稻幼苗培育试验。在水稻种子萌发不同时间（第5、7、9、11天）进行相同强度（1/2断根）的断根处理；在种子萌发至第9天，对萌发的水稻幼苗进行A1.5（断根尖1.5 cm）、A1/2（断1/2根长）、A2.0（留剩余根长2.0 cm）3种不同强度的断根处理，分别设置对照组（CK），检测水稻幼苗根系形态、株高、茎粗、根冠比、光合特性和水分利用效率等指标，并采用隶属函数法对水稻幼苗根系形态评价，确定最优处理。【结果】种子萌发第7天，1/2断根处理后的根系形态最佳；A2.0处理下的根系形态最佳。2种断根方式下，水稻幼苗的根冠比均不同程度的降低，但和CK相比，并无显著性差异。种子萌发第9天断根处理根冠比最低，为0.228 5。试验还发现，断根处理可降低叶片的气孔导度，进而提高水稻自身的水分利用效率。种子萌发第9天断根处理水分利用效率最高，比CK增加14.93%。A2.0处理水分利用效率最高，比CK增加38.99%。【结论】通过开展对比试验探索断根对水稻幼苗根系形态及水分利用效率影响，旨为我国节水农业的发展提供切实可行的科学依据和数据支撑。
Publisher
Chinese Academy of Agricultural Sciences (CAAS) Farmland Irrigation Research Institute Editorial Office of Journal of Irrigation and Drainage
Subject
