Abstract
Aims
Low-vigour scion cultivars and dwarfing rootstocks are a significant contributing factor to the success of modern temperate orchard systems. Planting density and canopy efficiency are currently limited in macadamia by a lack of low-vigour cultivars and rootstocks. The relationships between xylem vessel diameter, hydraulic conductivity and vigour are implicated in dwarf cultivars and low-vigour rootstocks of peach and apple. This study aims to determine relationships between vessel anatomy and tree-scale vigour in subtropical macadamia, to stimulate the development of low vigour cultivars and dwarfing rootstocks.
Methods
Stem sections from the most recent mature flush were collected from five replicates of three macadamia cultivars: ‘D4’ (high vigour), ‘B25’ (intermediate vigour) and ‘B63’ (low vigour). Sections were imaged under a fluorescence microscope in order to measure the number and size of all xylem vessels in the stem.
Results
The three cultivars showed distinct differences in height over 5 years of measurement (P < 0.001). Change in tree height related to the xylem vessel characteristics of mean vessel area of the ten largest vessels per section (R2 = 0.57, P < 0.001), pith size (R2 = 0.70, P < 0.001) and total additive vessel area (R2 = 0.41, P < 0.01).
Conclusions
This study indicates that relationships between anatomical structure and vigour in macadamia are likely to be similar to those of well-studied temperate tree crops and that anatomical traits may be useful in the selection of low-vigour cultivars. Future work should investigate hydraulic relationships with vigour and rootstock-scion interactions in macadamia.
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Abbreviations
- Co:
-
Cortex
- Ep:
-
Epidermis
- FC:
-
Outer fibre cap
- MR:
-
Medullary rays
- Ph:
-
Phloem
- VB:
-
Vascular bundle
- XT:
-
Xylem tissue area
- XV:
-
Individual metaxylem vessel
- XV10 :
-
Mean of ten largest metaxylem vessels
- XVA:
-
Total additive area of metaxylem lumen per section
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Acknowledgements
We thank Rob Sullivan, Rumelo Amor and Andrew Thompson for use of the histology labs and imaging facilities at Queensland Brain Institute. This work was supported by Hort Innovation using the Hort Innovation Across Horticulture research and development levy, co-investment from DAF and contributions from the Australian Government. Hort Innovation is the grower-owned, not-for-profit research and development corporation for Australian horticulture. This work is part of the Macadamia Breeding and Conservation Project and the Small Tree – High Productivity Initiative including research collaborations between the Queensland Department of Agriculture and Fisheries (DAF), NSW Department of Primary Industries and the Queensland Alliance for Agriculture and Food Innovation.
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Toft, B.D., Alam, M.M. & Topp, B.L. Anatomical structure associated with vegetative growth variation in macadamia. Plant Soil 444, 343–350 (2019). https://doi.org/10.1007/s11104-019-04285-6
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DOI: https://doi.org/10.1007/s11104-019-04285-6