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Adji Beda InnocentAkaffou Doffou SélastiqueKouassi Kouadio HenriHouphouet Yao PatriceDuminil JérômeSabatier Sylvie-Annabel. 2020. Influence of different environments on germination parameters and seedling morphology in Khaya senegalensis (Desr.) A. Juss (Meliaceae). American Journal of Plant Sciences11 (10) : 1579-1600.

Mots-clés Agrovoc : KhayaGermination des grainesPlantuleMorphologie végétaleFaculté germinative

Mots-clés géographiques Agrovoc : Côte d’Ivoire

Mots-clés complémentaires : Khaya senegalensis

Mots-clés libres : Khaya senegalensisEnvironments,Germination ParametersGreenhouseCôte d’Ivoire

Classification Agris : F03 – Production et traitement des semences
F62 – Physiologie végétale : croissance et développement

Champ stratégique Cirad : CTS 7 (2019-) – Hors champs stratégiques

Auteurs et affiliations

  • Adji Beda Innocent, CIRAD-BIOS-UMR AMAP (FRA) – auteur correspondant
  • Akaffou Doffou Sélastique, Université Jean Lorougnon Guédé (CIV)
  • Kouassi Kouadio Henri, Université Jean Lorougnon Guédé (CIV)
  • Houphouet Yao Patrice, Université Jean Lorougnon Guédé (CIV)
  • Duminil Jérôme, IRD (FRA)
  • Sabatier Sylvie-Annabel, CIRAD-BIOS-UMR AMAP (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/596843/)

Article de revue ; Article de recherche ; Article de revue à comité de lecture Revue en libre accès total
Version publiée – Anglais
Sous licence Licence Creative Commons.
ajps_2020102314131765.pdf

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Estimation of stem and leaf dry biomass using a non-destructive method applied to African Coffea species

Abstract

The coffee tree is an important economic
plant for several developing countries. Stem and leaf
dry biomass, which are key traits of plant production,
are used in functional-structural plant models to
simulate plant growth and predict yield. These values
are difficult to obtain since they classically rely on
time-consuming protocols and require destructive
measurements. Measuring stem and leaf dimensions
(length and width) to estimate them provides a nondestructive
and rapid approach for use in the field. In
this study we sought the best allometric relationships
existing between stem and leaf dimensions and their
corresponding dry mass in order to avoid destructive
measurements which are also time-consuming. This
was investigated in three coffee species: Coffea
canephora, Coffea liberica var. liberica and Coffea
liberica var. dewevrei in Ivory Coast. For each species,
the internodes and leaves of three axis categories
(stem, branch and branchlet) comprising the main
compartments were sampled. Two different equations
were found to estimate the stem and leaf dry mass
whatever the species and the axis categories: (1) a
linear equation for the relation between the stem
volume (V) and its corresponding dry mass (IWe),
IWe = 0.70 9 V and (2) a power law for the relation
between the leaf area [as the product of length (LL)
and width (Wi)] and its dry mass (LWe),
LWe = 0.007 (LL 9 LWi)1.02. Finally, stem and leaf
dry mass could be easily obtained without destructive
measurements. This method could be applied to
estimate the plant total leaf area and the total stem
and leaf biomass of a plant in an agroforestry system.

Keywords

Okoma et al 2016 – Allometries Coffea Agroforest Syst

Influence of Different Environments on Germination Parameters and Seedling Morphology in Khaya senegalensis (Desr.) A. Juss (Meliaceae)

Mis en avant

Abstract
Khaya senegalensis is one of the largest and most majestic trees in Africa.
Overexploited for its precious wood and medicinal values, the natural stands
of this species are in danger of extinction in Côte d’Ivoire. Its sustainable
management through regeneration techniques and assessment of its degree of
adaptation to the changing climate is necessary. The aim of this study is to
evaluate the effect of different environments on seedling germination and
development in Khaya senegalensis . A total of 2160 seeds from different
mother plants and 540 individuals from seed germination were selected and
evaluated. The trials were conducted on three sites that were distinct by their
microclimate (two nurseries in Côte d’Ivoire and one greenhouse in France).
Analysis of variance showed that germination and morphology parameters
were not influenced by the characteristics of the mother plants used (p >
0.05), but rather by the study sites (P < 0.05). The stable and controlled
greenhouse climate was more advantageous for latency time (12.66 ± 0.80
days), germination delay (16.96 96 ± 0.54 days), germination speed (19.66 ±
2.95 days), germination duration (10.83 ± 2.27 days) and germination rate
(88.88 ± 7.97) with more vigorous sowing than the other two sites. The results
showed in general that the higher the height of the seedlings, the thicker the
diameter of the seedlings (r = 0.796) and the higher the number of leaves (r =
0.946). This savannah species is native to the arid zones of Africa, but this
study highlighted its adaptive potential to changing and different climates.
These results are decision support tools for the regeneration of native pioneer
forest species with high agroforestry potential and socio-economic importance such as Khaya senegalensis . This study could be extended to other species
in order to restore disturbed ecosystems.
Keywords
Khaya senegalensis , Environments, Germination Parameters, Greenhouse,
Côte d’Ivoire

https://m.scirp.org/papers/103637