https://hdl.handle.net/1959.11/29559
Title: | Root proliferation in response to P stress and space: implications for the study of root acclimation to low P supply and P acquisition efficiency |
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Contributor(s): | Mclachlan, Jonathan W (author)![]() ![]() ![]() |
Publication Date: | 2020-06 |
Early Online Version: | 2020-05-14 |
DOI: | 10.1007/s11104-020-04535-y |
Handle Link: | https://hdl.handle.net/1959.11/29559 |
Abstract: | Aims The experiment was conducted to understand how root morphological traits contributed to the contrasting P-acquisition efficiencies of two Trifolium subterraneum cultivars. Methods Phosphorus acquisition, root length proliferation and root acclimation to P deficiency were investigated by varying the P supply (20-300 mg P kg−1) and planting density (1-12 plants pot−1) of clover micro-swards. Results The shoot yield of both cultivars increased in response to increased P supply and increased planting density. Higher planting densities increased shoot yield by reducing the time to leaf canopy closure. In P-deficient soil, the ‘less P-efficient’ cultivar acquired less P and yielded relatively poorly compared with the ‘more P-efficient’ cultivar when planting density was low (<6 plants pot−1). However, the P acquisition and yields of the cultivars were equivalent when planting density was high (~6-12 plants pot−1). Both cultivars proliferated nutrient-foraging roots in response to P limitation and space (i.e. lower planting densities). However, the proliferation responses of the cultivars differed, particularly in response to space. Conclusions Differential proliferation responses, combined with differences in specific root length, explained how the cultivars differed in P-acquisition efficiency. The results indicate that inappropriate cultural conditions (e.g. planting densities) may confound attempts to define P-efficient root traits and to identify genotypes with improved P-acquisition efficiency. |
Publication Type: | Journal Article |
Source of Publication: | Plant and Soil, 451(1-2), p. 389-407 |
Publisher: | Springer Netherlands |
Place of Publication: | Netherlands |
ISSN: | 1573-5036 0032-079X |
Fields of Research (FoR) 2008: | 070306 Crop and Pasture Nutrition 070303 Crop and Pasture Biochemistry and Physiology 050304 Soil Chemistry (excl. Carbon Sequestration Science) |
Fields of Research (FoR) 2020: | 300407 Crop and pasture nutrition 300404 Crop and pasture biochemistry and physiology 410604 Soil chemistry and soil carbon sequestration (excl. carbon sequestration science) |
Socio-Economic Objective (SEO) 2008: | 830406 Sown Pastures (excl. Lucerne) |
Socio-Economic Objective (SEO) 2020: | 100505 Sown pastures (excl. lucerne) |
Peer Reviewed: | Yes |
HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
Appears in Collections: | Journal Article School of Environmental and Rural Science |
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