@article{fdi:010089047,
  title = {{C}oncurrent starch accumulation in stump and high fruit production in coffee ({C}offea arabica)},
  author = {{C}ambou, {A}ur{\'e}lie and {T}haler, {P}. and {C}lement-{V}idal, {A}. and {B}arth{\`e}s, {B}ernard and {C}harbonnier, {F}. and {V}an den {M}eersche, {K}. and {V}ega, {M}. {E}. {A}. and {A}velino, {J}. and {D}avrieux, {F}. and {L}abouisse, {J}. {P}. and {V}irginio, {E}. {D}. and {D}eleporte, {P}. and {B}runet, {D}idier and {L}ehner, {P}. and {R}oupsard, {O}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n coffee, fruit production on a given shoot drops after some years of high yield, triggering pruning to induce resprouting. {T}he timing of pruning is a crucial farmer's decision affecting yield and labour. {O}ne reason for fruit production drop could be the exhaustion of resources, particularly the non-structural carbohydrates ({NSC}). {T}o test this hypothesis in a {C}offea {L}. arabica agroforestry system, we measured the concentrations of {NSC}, carbon ({C}) and nitrogen ({N}) in leaves, stems and stumps of the coffee plants, 2 and 5 years after pruning. {W}e also compared shaded vs full sun plants. {F}or that purpose, both analytical reference and visible and near infrared reflectance spectroscopy ({VNIRS}) methods were used. {A}s expected, concentrations of biochemical variables linked to photosynthesis activity ({N}, glucose, fructose, sucrose) decreased from leaves to stems, and then to stumps. {I}n contrast, variables linked more closely to plant structure and reserves (total {C}, {C}:{N} ratio, starch concentration) were higher in long lifespan organs like stumps. {S}hading had little effect on most measured parameters, contrary to expectations. {C}oncentrations of {N}, glucose and fructose were higher in 2-year-old organs. {C}onversely, starch concentration in perennial stumps was three times higher 5 years after pruning than 2 years after pruning, despite high fruit production. {T}herefore, the drop in fruit production occurring after 5-6 years was not due to a lack of {NSC} on plant scale. {S}tarch accumulation in perennial organs concurrently to other sinks, such as fruit growth, could be considered as a 'survival' strategy, which may be a relic of the behaviour of wild coffee (a tropical shade-tolerant plant). {T}his study confirmed that {VNIRS} is a promisingly rapid and cost-effective option for starch monitoring (coefficient of determination for validation, {R}-val(2) = 0.91), whereas predictions were less accurate for soluble sugars, probably due to their too similar spectral signature.},
  keywords = {agroforestry system ; non-structural carbohydrates ({NSC}) ; perennial plant ; reserves ; visible and near infrared reflectance spectroscopy ({VNIRS})},
  booktitle = {},
  journal = {{T}ree {P}hysiology},
  volume = {41},
  numero = {12},
  pages = {2308--2325},
  ISSN = {0829-318{X}},
  year = {2021},
  DOI = {10.1093/treephys/tpab075},
  URL = {https://www.documentation.ird.fr/hor/fdi:010089047},
}