Although foliar-applied boron (B) could rapidly and effectively relieve B deficiency of plants, the distribution and mobility of foliar-applied B in citrange, an important rootstock of citrus, are poorly understood. This study aimed to investigate the transportation and variation of B allocation in different parts of citrange under different B conditions by spraying 10B on the lower mature leaves of citrange rootstock for 8 weeks. The results indicated that foliar B on lower mature leaves led to higher 10B abundance and 10B concentration in different parts of plants. Compared with the low-B plants, 10B abundance in stems, lower, and upper mature leaves of medium-B plants increased 23.95, 7.22, and 8.33% respectively. Moreover, under low- and medium-B conditions, abundance and percentage of 10B were higher in roots than that in other tissues after foliar application 10B. Meanwhile, abundance and percentage of foliar-10B in stems and old leaves under B-insufficient condition were much lower than that of B-sufficient condition. Furthermore, the 10B allocation rate was the highest in roots under the two different B conditions. There were higher 10B allocation rates in new leaves and lower mature leaves, and lower 10B allocation rates in stems and upper mature leaves in medium-B plants comparing with that in low-B plants. All these results suggest that foliar-applied 10B on lower mature leaves could be translocated to every part of citrange rootstock, with the majority distributed in roots, and the mobility of foliar B from lower mature leaves to other parts was different between low- and medium-B treatments, leading to a significant variation in translocation rate for each part of citrange.
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- LB + F:
Low boron + foliar-B fertilization
- MB + F:
Medium boron + foliar boron fertilization
Boron obtained from foliar fertilization with H103BO3
Allocation rate of 10B obtained from foliar boron
Lower mature leaves
Upper mature leaves
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This work was supported by the National Natural Science Foundation of China (41271320) and the Fundamental Research Funds for the Central Universities (2017PY055).
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Wu, X., Riaz, M., Yan, L. et al. Distribution and Mobility of Foliar-Applied Boron (10B) in Citrange Rootstock Under Different Boron Conditions. J Plant Growth Regul 39, 575–582 (2020). https://doi.org/10.1007/s00344-019-10001-6
- Foliar-applied 10B
- Citrange rootstock