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Effects of root morphology, respiration and carboxylate exudation on carbon economy in two non‐mycorrhizal lupines under phosphorus deficiency
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- Sachiko Funayama‐Noguchi
- Department of Biological Sciences, Graduate School of Science The University of Tokyo Tokyo Japan
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- Masaru Shibata
- Faculty of Education Yamaguchi University Yamaguchi Japan
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- Ko Noguchi
- School of Life Sciences Tokyo University of Pharmacy and Life Sciences Tokyo Japan
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- Ichiro Terashima
- Department of Biological Sciences, Graduate School of Science The University of Tokyo Tokyo Japan
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Description
<jats:title>Abstract</jats:title><jats:p>Under phosphorus (P) deficiency, <jats:italic>Lupinus albus</jats:italic> develops cluster roots that allow efficient P acquisition, while <jats:italic>L</jats:italic>. <jats:italic>angustifolius</jats:italic> without cluster roots also grows well. Both species are non‐mycorrhizal. We quantitatively examined the carbon budgets to investigate the different strategies of these species. Biomass allocation, respiratory rates, protein amounts and carboxylate exudation rates were examined in hydroponically‐grown plants treated with low (1 μM; P1) or high (100 μM; P100) P. At P1, <jats:italic>L</jats:italic>. <jats:italic>albus</jats:italic> formed cluster roots, and <jats:italic>L</jats:italic>. <jats:italic>angustifolius</jats:italic> increased biomass allocation to the roots. The respiratory rates of the roots were faster in <jats:italic>L</jats:italic>. <jats:italic>albus</jats:italic> than in <jats:italic>L</jats:italic>. <jats:italic>angustifolius</jats:italic>. The protein amounts of the non‐phosphorylating alternative oxidase and uncoupling protein were greater in the cluster roots of <jats:italic>L</jats:italic>. <jats:italic>albus</jats:italic> at P1 than in the roots at P100, but similar between the P treatments in <jats:italic>L</jats:italic>. <jats:italic>angustifolius</jats:italic> roots. At P1, <jats:italic>L</jats:italic>. <jats:italic>albus</jats:italic> exuded carboxylates at a faster rate than <jats:italic>L</jats:italic>. <jats:italic>angustifolius</jats:italic>. The carbon budgets at P1 were surprisingly similar between the two species, which is attributed to the contrasting root growth and development strategies. <jats:italic>L</jats:italic>. <jats:italic>albus</jats:italic> developed cluster roots with rapid respiratory and carboxylate exudation rates, while <jats:italic>L</jats:italic>. <jats:italic>angustifolius</jats:italic> developed a larger root system with slow respiratory and exudation rates.</jats:p>
Journal
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- Plant, Cell & Environment
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Plant, Cell & Environment 44 (2), 598-612, 2020-11-06
Wiley
