Root morphology and its contribution to a large root system for phosphorus uptake by Rytidosperma species (wallaby grass)

Waddell, Heidi A.; Simpson, Richard J.; Ryan, Megan H.; Lambers, Hans; Garden, D. L.; Richardson, Alan

doi:10.1007/s11104-016-2933-y

Cited by 24 publications

(17 citation statements)

References 48 publications

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“…Average root hair length was a key component of the Broot hair cylinder volume^which was strongly correlated with plant P uptake in the reports by Waddell et al (2016) and Haling et al (2016). The paper by Vincent et al (2016) reports work to substantially reduce the effort required to quantify root hair development in situ.…”

mentioning

confidence: 96%

“…Several papers in this Special Issue focus on the relationship between root morphology and uptake of P and other nutrients from soil (Erel et al 2016;Jeffery et al 2016;Waddell et al 2016). In the first paper, Waddell et al (2016) report a study of nine species of Australian native wallaby grasses (Rytidosperma) which differ in their P requirements (Waddell et al 2015).…”

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confidence: 99%

“…In the first paper, Waddell et al (2016) report a study of nine species of Australian native wallaby grasses (Rytidosperma) which differ in their P requirements (Waddell et al 2015). The aim was to determine the contribution of root morphology to P uptake by growing species in soil containing a range of P levels.…”

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confidence: 99%

“…Similar to Waddell et al (2016), cultivars with greater soil exploration were also found to generally have superior growth and nutrient uptake by Haling et al (2016) and Andresen et al (2016). Andresen et al (2016) examined the root traits, growth and nutrition of several cultivars of onion (Allium cepa L.), spring wheat (Triticum aestivum L.) and lettuce (Lactuca sativa L.) grown in a low nutrient status soil.…”

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confidence: 99%

“…They showed that plants with both genes accumulated more shoot P and that over half of the variation in shoot P accumulation was predicted based on phytase-labile soil P, citrate efflux and phytase activity. Future studies should measure additional parameters such as efflux of other organic acids and, in particular, the root morphological traits most likely to enhance P uptake (see Andresen et al 2016;Jeffery et al 2016;Waddell et al 2016) to assess the relative merit of all these traits. Future studies should also consider the costs and benefits of colonisation by AM fungi and, perhaps, fine root endophyte.…”

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confidence: 99%

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Belowground solutions to global challenges: special issue from the 9th symposium of the International Society of Root Research

2017

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confidence: 96%

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confidence: 99%

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confidence: 99%

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Belowground solutions to global challenges: special issue from the 9th symposium of the International Society of Root Research

2017

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Strategies to acquire and use phosphorus in phosphorus-impoverished and fire-prone environments

et al. 2022

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Background Unveiling the diversity of plant strategies to acquire and use phosphorus (P) is crucial to understand factors promoting their coexistence in hyperdiverse P-impoverished communities within fire-prone landscapes such as in cerrado (South America), fynbos (South Africa) and kwongan (Australia). Scope We explore the diversity of P-acquisition strategies, highlighting one that has received little attention: acquisition of P following fires that temporarily enrich soil with P. This strategy is expressed by fire ephemerals as well as fast-resprouting perennial shrubs. A plant’s leaf manganese concentration ([Mn]) provides significant clues on P-acquisition strategies. High leaf [Mn] indicates carboxylate-releasing P-acquisition strategies, but other exudates may play the same role as carboxylates in P acquisition. Intermediate leaf [Mn] suggests facilitation of P acquisition by P-mobilising neighbours, through release of carboxylates or functionally similar compounds. Very low leaf [Mn] indicates that carboxylates play no immediate role in P acquisition. Release of phosphatases also represents a P-mining strategy, mobilising organic P. Some species may express multiple strategies, depending on time since germination or since fire, or on position in the landscape. In severely P-impoverished landscapes, photosynthetic P-use efficiency converges among species. Efficient species exhibit rapid rates of photosynthesis at low leaf P concentrations. A high P-remobilisation efficiency from senescing organs is another way to use P efficiently, as is extended longevity of plant organs. Conclusions Many P-acquisition strategies coexist in P-impoverished landscapes, but P-use strategies tend to converge. Common strategies of which we know little are those expressed by ephemeral or perennial species that are the first to respond after a fire. We surmise that carboxylate-releasing P-mobilising strategies are far more widespread than envisaged so far, and likely expressed by species that accumulate metals, exemplified by Mn, metalloids, such as selenium, fluorine, in the form of fluoroacetate, or silicon. Some carboxylate-releasing strategies are likely important to consider when restoring sites in biodiverse regions as well as in cropping systems on P-impoverished or strongly P-sorbing soils, because some species may only be able to establish themselves next to neighbours that mobilise P.

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Contrasting communities of arbuscule-forming root symbionts change external critical phosphorus requirements of some annual pasture legumes

Jeffery

Simpson

Lambers

et al. 2018

Applied Soil Ecology

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Annual pasture legumes with a superior ability to acquire soil phosphorus (P) through specialised root systems could lower P-fertiliser requirements. Root traits related to Pacquisition are commonly examined for plants in pots grown in glasshouses, however we found that root length was greatly decreased and root exudates greatly increased when shoots of these plants were constrained from spreading laterally, as would also occur in dense pasture swards in the field. We suggest that canopy constraint should be routinely used when screening plants in the glasshouse for root traits likely to improve P-acquisition under field conditions.

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Root morphology and its contribution to a large root system for phosphorus uptake by Rytidosperma species (wallaby grass)

Cited by 24 publications

References 48 publications

Belowground solutions to global challenges: special issue from the 9th symposium of the International Society of Root Research

Belowground solutions to global challenges: special issue from the 9th symposium of the International Society of Root Research

Strategies to acquire and use phosphorus in phosphorus-impoverished and fire-prone environments

Contrasting communities of arbuscule-forming root symbionts change external critical phosphorus requirements of some annual pasture legumes

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