@article{fdi:010084242,
  title = {{R}hizodeposition efficiency of pearl millet genotypes assessed on a short growing period by carbon isotopes (delta {C}-13 and ({FC})-{C}-14)},
  author = {{N}dour, {P}apa {M}amadou {S}itor and {H}atte, {C}. and {A}chouak, {W}. and {H}eulin, {T}. and {C}ournac, {L}aurent},
  editor = {},
  language = {{ENG}},
  abstract = {{R}hizosheath size varies significantly with crop genotype, and root exudation is one among its driving factors. {U}nravelling the relationships between rhizosheath formation, root exudation and soil carbon dynamics may bring interesting perspectives in terms of crop breeding towards sustainable agriculture. {H}ere we grew four pearl millet ({C}4 plant type: delta {C}-13 of -12.8 parts per thousand, ({FC})-{C}-14 = 1.012) inbred lines showing contrasting rhizosheath sizes in a {C}3 soil type (organic matter with delta {C}-13 of -22.3 parts per thousand, ({FC})-{C}-14 = 1.045). {W}e sampled the root-adhering soil ({RAS}) and bulk soil after 28 d of growth under a semi-controlled condition. {T}he soil organic carbon ({SOC}) content and delta {C}-13 and ({FC})-{C}-14 of soil samples were measured and the plant-derived {C} amount and {C}-lost / {C}-new ratio in the {RAS} were calculated. {T}he results showed a significant increase in delta {C}-13 in the {RAS} of the four pearl millet lines compared to the control soil, suggesting that this approach was able to detect plant {C} input into the soil at an early stage of pearl millet growth. {T}he concentration of plant-derived {C} in the {RAS} did not vary significantly between pearl millet lines, but the absolute amount of plant-derived {C} varied significantly when we considered the {RAS} mass of these different lines. {U}sing a conceptual model and data from the two carbon isotopes' measurements, we evidenced a priming effect for all pearl millet lines. {I}mportantly, the priming effect amplitude ({C}-lost / {C}-new ratio) was higher for the small rhizosheath (low-aggregation) line than for the large rhizosheath (high-aggregation) ones, indicating a better {C} sequestration potential of the latter.},
  keywords = {},
  booktitle = {},
  journal = {{S}oil},
  volume = {8},
  numero = {1},
  pages = {49--57},
  ISSN = {2199-3971},
  year = {2022},
  DOI = {10.5194/soil-8-49-2022},
  URL = {https://www.documentation.ird.fr/hor/fdi:010084242},
}