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Effect of elevated CO2 on carbon partitioning and exudate release from Plantago lanceolata seedlings

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JournalPhysiologia plantarum
DatePublished - Jun 1998
Issue number2
Volume103
Number of pages7
Pages (from-to)280-286
Original languageEnglish

Abstract

Plantago lanceolata L. seedlings were grown in sand microcosm units over a 43-day experimental period under two CO2 regimes (800 or 400 mu mol mol(-1)) to investigate the effect of elevated atmospheric CO2 concentration on carbon partitioning and exudate release. Total organic carbon (TOC) content of the collected exudate material was measured throughout the experimental period. After 42 days growth the seedlings were labelled with [C-14]-CO2 and the fate of the label within the plant and its release by the roots monitored. Elevated CO2 significantly (P less than or equal to 0.001) enhanced shoot, root and total dry matter production although the R:S ratio was unaltered, suggesting no alteration in press carbon partitioning. The cumulative release of TOC (in mg C) over 0-42 days was unaltered by CO2 treatment however, when expressed as a percentage of net assimilated C, ambient-grown plants released a significantly (P less than or equal to 0.001) higher percentage from their roots compared to elevated CO2-grown plants (i.e. 8 vs 3%). The distribution of C-14-label was markedly altered by CO2 treatment with significantly (P less than or equal to 0.001) greater per cent label partitioned to the roots under elevated CO2. This indicates increased partitioning of recent assimilate belowground under elevated CO2 treatment although there was no significant difference in the percentage of C-14-label released by the roots. Comparison of plant C budgets based on C-14-pulse-chase methodology and TOC measurements is discussed.

    Research areas

  • carbon partitioning, C-14-CO2 pulse-chase, elevated CO2, exudation, Plantago lanceolata, total organic carbon, ZEA-MAYS L, ATMOSPHERIC CO2, ROOT EXUDATION, SOIL BIOTA, RHIZOSPHERE, RESPONSES, GROWTH, FLOW, ENRICHMENT, MAIZE

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