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- Title
Boron distribution and mobility in navel orange grafted on citrange and trifoliate orange.
- Authors
Liu, Gui-Dong; Wang, Rui-Dong; Wu, Li-Shu; Peng, Shu-Ang; Wang, Yun-Hua; Jiang, Cun-Cang
- Abstract
Background and Aims: In China, boron (B) deficiency is frequently observed in citrus orchards, and is responsible for considerable loss of productivity and quality. A better understanding of B distribution and remobilization within orange plants is important for developing programs in rational fertilization and effective mitigation of B-deficiency. In the present study (i) the distribution of newly absorbed B and (ii) the translocation of foliar-applied B in 'Newhall' navel orange grafted on citrange and trifoliate orange was investigated. Methods: B was applied in the nutrient solution or sprayed on the lower-old leaves of both grafted plants for 35 days. Results: In the B uptake experiment, citrange-grafted plants showed higher newly acquired total B content and B concentration in both lower-old and upper-old leaves than those in trifoliate-orange-grafted plants. The newly absorbed B in the new leaves was much higher than that in the lower-old leaves and the upper-old leaves in both grafted plants. Foliar application of B to the lower-old leaves resulted in B translocation to the upper-old leaves and the new leaves with preference mainly to the new leaves in both citrange and trifoliate orange when root B supply was relatively low. However, B sprayed to the lower-old leaves not only did not increase the abundance percentage of B in the root, but also reduced B concentration and the total B content in the root. Conclusions: The results suggest that foliar-applied B can be translocated within both grafted plants, which might also depress B uptake from root medium with low B supply. Rootstock can affect the B distribution in old leaves in navel orange, and newly absorbed B was preferentially transported to the new leaves.
- Subjects
ORCHARDS; FERTILIZATION (Biology); ORANGES; GRAFTING (Horticulture); BORON
- Publication
Plant & Soil, 2012, Vol 360, Issue 1/2, p123
- ISSN
0032-079X
- Publication type
Article
- DOI
10.1007/s11104-012-1225-4