Understanding the histological and histochemical mechanisms involved in gum arabic formation in Senegalia senegal, a key species of the Sahelian region
Abstract
Senegalia senegal produces a hydrocolloid known as gum arabic, which is rich in arabinogalactan proteins (AGPs) and of high economic importance. Despite its economic value, the anatomical origin and formation mechanisms of gum arabic remain poorly understood. In this study, we combined histological, histochemical, and immunolocalization techniques to investigate the spatial, cellular, and temporal dynamics of gum formation in S. senegal. We show that gum pockets are formed exclusively in the inner secondary phloem, between phloem rays, and are initiated by companion cells. Using Yariv reagent and JIM4 antibody, we identified AGP accumulation as an early hallmark of pocket initiation. Gum pocket development occurs via a schizogenous process, involving progressive cell wall separation at the middle lamella, without signs of cell lysis. We also demonstrate that gum pocket formation is seasonally regulated, peaking during the dry season and followed by a gradual resorption phase. The decline in AGP signal and the formation of new phloem tissues suggest a possible metabolic recycling of non-exuded gum to fuel cambial reactivation. Importantly, the surface area of gum pockets correlates with the amount of gum harvested, offering a potential anatomical proxy for selecting high-yielding trees. Our findings redefine the developmental and physiological framework of gum arabic production and provide new perspectives for genetic improvement and sustainable resource management in Sahelian ecosystems.
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BibTeX
@article{abdoulaye2026understanding,
title = {{Understanding the histological and histochemical mechanisms involved in gum arabic formation in Senegalia senegal, a key species of the Sahelian region}},
author = {Ali Abdoulkadri Abdoulaye and Frédéric Gatineau and Aichatou Assoumane and Matthieu Dejean and Christelle Baptiste and Jean-Luc Verdeil},
journal = {Protoplasma},
year = {2026},
month = jun,
doi = {10.1007/s00709-026-02220-y},
url = {https://hal.science/hal-05676988v2},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Understanding the histological and histochemical mechanisms involved in gum arabic formation in Senegalia senegal, a key species of the Sahelian region
AU - Ali Abdoulkadri Abdoulaye
AU - Frédéric Gatineau
AU - Aichatou Assoumane
AU - Matthieu Dejean
AU - Christelle Baptiste
AU - Jean-Luc Verdeil
PY - 2026
DA - 2026/06/11
JO - Protoplasma
DO - 10.1007/s00709-026-02220-y
UR - https://hal.science/hal-05676988v2
AB - Senegalia senegal produces a hydrocolloid known as gum arabic, which is rich in arabinogalactan proteins (AGPs) and of high economic importance. Despite its economic value, the anatomical origin and formation mechanisms of gum arabic remain poorly understood. In this study, we combined histological, histochemical, and immunolocalization techniques to investigate the spatial, cellular, and temporal dynamics of gum formation in S. senegal. We show that gum pockets are formed exclusively in the inner secondary phloem, between phloem rays, and are initiated by companion cells. Using Yariv reagent and JIM4 antibody, we identified AGP accumulation as an early hallmark of pocket initiation. Gum pocket development occurs via a schizogenous process, involving progressive cell wall separation at the middle lamella, without signs of cell lysis. We also demonstrate that gum pocket formation is seasonally regulated, peaking during the dry season and followed by a gradual resorption phase. The decline in AGP signal and the formation of new phloem tissues suggest a possible metabolic recycling of non-exuded gum to fuel cambial reactivation. Importantly, the surface area of gum pockets correlates with the amount of gum harvested, offering a potential anatomical proxy for selecting high-yielding trees. Our findings redefine the developmental and physiological framework of gum arabic production and provide new perspectives for genetic improvement and sustainable resource management in Sahelian ecosystems.
SN - 0033-183X
SN - 1615-6102
ER -