| 引用本文: | 朱 梅,胡晨帆,刘硕硕,等.断根对水稻幼苗根系形态及水分利用效率的影响[J].灌溉排水学报,2025,44(5):1-9. |
| ZHU Mei,HU Chenfan,LIU Shuoshuo,et al.断根对水稻幼苗根系形态及水分利用效率的影响[J].灌溉排水学报,2025,44(5):1-9. |
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| 摘要: |
| 【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。 |
| 关键词: 水稻幼苗；断根；根系形态；水分利用效率 |
| DOI：10.13522/j.cnki.ggps.2024355 |
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| Impact of root cutting on root architecture and water use efficiency of rice seedlings |
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ZHU Mei, HU Chenfan, LIU Shuoshuo, SHI Yunjia, LIU Jingzhe, LIN Shimiao
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School of Engineering, Anhui Agricultural University, Hefei 230036, China
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| Abstract: |
| 【Objective】An optimal root architecture not only provides anchorage for plants but also enhances the acquisition of water and nutrients, which are unevenly distributed in the soil profile. This study experimentally investigates how root cutting can improve the root architecture of rice seedlings and its subsequent impact on water use efficiency.【Method】The experiment used the rice variety Lvhan 639 as the model plant and included two treatments. In the first treatment, half of the root system was removed at 5, 7, 9, and 11 days after seedling emergence. In the second treatment, root cutting was conducted 9 days after seedling emergence, with the root being cut at 1.5 cm from the root tip (A1.5), at the middle of the root (A1/2), and cut the root to 2.0 cm (A2.0). The control group did not undergo any root cutting. In each treatment, we measured root architecture, plant height, stem diameter, root-to-shoot ratio, photosynthetic traits, and water use efficiency of the seedlings.【Result】In the first treatment, the most favorable root architecture was observed when half of the root was cut 7 days after seedling emergence. In the second treatment, (A2.0) produced the optimal root architecture. Root cutting reduced the root-to-shoot ratio in all cases, although the differences between the two treatments were not statistically significant. In the first treatment, the lowest root-to-shoot ratio (0.228 5) occurred when the root was cut 9 days after seedling emergence. Root cutting improved water use efficiency, primarily by decreasing stomatal conductance. In the first treatment, cutting the roots 9 days after seedling emergence increased water use efficiency by 14.93% compared to the control. In the second treatment, cutting the roots to 2.0 cm showed the highest water use efficiency, with a 38.99% improvement over the control.【Conclusion】Root cutting can effectively enhance both root architecture and water use efficiency in rice seedlings. Among the methods tested, cutting half of the root 7 days after seedling emergence or trimming the root to 2.0 cm on the 9th day after seedling emergence were most effective for optimizing root development and increasing water use efficiency. |
| Key words: rice seedlings; root cutting; root system configuration; water use efficiency |
