Obouayeba Abba Pacôme’s research while affiliated with Université Félix Houphouët-Boigny and other places

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Publications (6)


Contribution to Natural Rubber Production without Exogenous Hormonal Stimulation: An Experimental Study
  • Chapter

March 2022

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3 Reads

Obouayeba Samuel

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Ballo Espérance Kouadio

Fig. 1. Yield in g.t -1 .t -1 de of slow, moderate and active-metabolism Hevea brasiliensis, tapped in d/4 g t -1 t -1 : gram per tree per tapping
Fig. 2. Yield in kg.ha -1 .year -1 of slow, moderate and active-metabolism Hevea brasiliensis, tapped in d/2 Kg -1 ha -1 y -1 : kilogram per hectare per year
Description of the different treatments applied for nine years of experiment
Average values of the physiological parameters of the latex of active, moderate and slow-metabolism clones in downward tapping, subjected to different latex harvesting technologies for nine years of experiment
Contribution to Natural Rubber Production without Exogenous Hormonal Stimulation
  • Article
  • Full-text available

August 2021

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109 Reads

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2 Citations

Journal of Experimental Agriculture International

Rubber production and especially its increase absolutely depend on the activation of the latex-producing metabolism. Can the latex-producing metabolism activation mechanism developed by rubber tree lead to higher yield without exogenous hormonal stimulation? In order to verify this decisive hypothesis, several works, carried out for nine years in Southern Côte d’Ivoire, were conducted on some 15 clones (IRCA 18, IRCA 209, IRCA 111, IRCA 130, PB 235, PB 260, PB 280, PB 330, PB 310; GT 1, BPM 24, RRIC 100; PB 217 and PR 107) of the three metabolisms respectively, active, moderate and slow, with two main statistical designs. On a small scale, in a “one-tree plot” design, the same latex harvesting system, tapping in d4 with different hormonal stimulation regimes (0/y; 2/y; 4/y; 6/y; 8/y; 13/y; 18/y; 26/y, 39/y and 78/y), has been applied to all treatments. In a randomized complete block design, different tapping frequencies (d2, d3, d4, d5 and d6) and hormonal stimulation (0/y, 4/y, 8/y and 10/y) were applied. Whatever the stimulation regime, the average g.t-1.t-1 of the unstimulated control (56) of the active metabolism clones (PB 235, PB 310, IRCA 111 and IRCA 130) over 9 years was statistically the same order that of the stimulated patterns (54). The average g.t-1.t-1 of the control (60) was lower than that of the highest yielding stimulated patterns (67) of the clones (PB 330, PB 280, PB 260, IRCA 18 and IRCA 209). The average g.t-1.t-1of the unstimulated control (49) was significantly lower than that of the highest yielding stimulated treatment (57) of moderate metabolism clones (GT 1, BPM 24 and RRIC 100). The average g.t-1.t-1 of the unstimulated control (39) was significantly lower than that of the highest yielding stimulated treatment (70) of slow metabolism clones (PB 217 and PR 107). On a large scale and at tapping frequency (d2), the unstimulated latex harvesting system (d2 0/y) showed an average yield of (2341; 2266 and 1849 kg.ha-1.year-1 for the active, moderate and slow metabolisms, respectively) statistically comparable to those of the highest yielding tapping frequencies d3, d4, d5 and d6 all latex harvesting systems combined for the clones studied (2388; 2348 and 2256 kg.ha-1.year-1). These results show that it is possible to produce natural rubber without exogenous hormonal stimulation by judiciously playing on tapping intensity.

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Improvement of Productivity of the Moderate Metabolism Clone GT 1 of Hevea Brasiliensis Muell. Arg. by Early Upward Tapping in Côte d'Ivoire

February 2021

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144 Reads

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2 Citations

American Journal of BioScience


Treatments applied in tapping downward to clones PB 217 and PR 107 during nine years of experimentation in southwestern Cote d'Ivoire
Mean values of tree trunk circumference (cm.y -1 ) in clones PB 217 and PR 107 in tapping from treatment for nine years in the southwest Côte d'Ivoire
Average tapping panel dryness rates of trees in clones PB 217 and PR 107, in tapping downward, according to treatments for nine years in south-west Côte d'Ivoire
Annual mean values of the physiological parameters of clones PB 217 and PR 107,
Synthesis of physiological profiles and average values of physiological index of clones PB 217 and PR 107 in tapping downward during nine years of experimentation with respect to the six latex harvesting systems
Contribution of Latex Micro Diagnosis to Modern Management of Rubber Plantations: Case of Clones With Low or Slow Metabolism PB 217 and PR 107

March 2018

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119 Reads

European Scientific Journal

The cultivated rubber clones are sensitive to latex harvesting regimes according to their laticiferous metabolism. Thus, in order to determine the best latex harvesting systems of clones with low or slow metabolism, six latex harvesting technologies are applied to them in a bulk statistical device from Fisher to four rehearsals. The rubber is tapped in downward half spiral stimulated or not for nine years after the opening of the tapping panel. The agronomic parameters (production, vegetative growth), the tapping panel dryness and those of the latex micro diagnosis were evaluated. The results indicate that these clones independently of the latex harvesting system have good rubber productivity (2310 kg.ha -1 .y-1 ) with good radial vegetative growth (2.9 cm.y -1 ). Their trees show a well-balanced physiological profile and an acceptable sensitivity to the tapping panel dryness (4.9%). However, the physiological index, the bark consumption and the sensitivity to the tapping panel dryness lead to retain the latex harvesting technologies "S/2 d3 6d/7 Pa1(1) ET2.5% 4/y, S/2 d4 6d/7 Pa1(1) ET2.5% 4/y and S/2 d4 6d/7 Pa1(1) ET2.5% 8/y” for the best. This index, favorably influencing the choice of technologies adapted to clones with active metabolism, contributes to the modern and efficient management of a rubber plantation.


Annual average of dry rubber production expressed in kg.ha -1 .y -1 in tapping downward of clones PB 235, IRCA 18, IRCA 130, PB 260 and PB 330 for nine years in the south-west of Côte d'Ivoire
Average tapping panel dryness rates of trees in clones PB 235, IRCA 18, IRCA 130, PB 260 and PB 330, in tapping downward, according to treatments for nine years in south-west Côte d'Ivoire
Annual mean values of the physiological parameters of clones PB 235, IRCA 18,
Synthesis of physiological profiles and average values of physiological index of clones PB 235, IRCA 18, IRCA 130, PB 260 and PB 330 in tapping downward during nine years of experimentation with respect to the six latex harvesting systems
Latex Micro Diagnosis, Modern Management Tool of Rubber Plantations of Clones With Active or Rapid Metabolism IRCA 18, IRCA 130, PB 235, PB 260 and PB 330

January 2018

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82 Reads

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2 Citations

European Scientific Journal

The cultivated rubber clones are sensitive to latex harvesting regimes according to their laticiferous metabolism. Thus, in order to determine the best latex harvesting systems of clones with active or rapid metabolism (IRCA 18, IRCA 130, PB 235, PB 260 and PB 330), six latex harvesting technologies are applied to them in a bulk statistical device from Fisher to four rehearsals. The rubber is tapped in downward half spiral stimulated or not for nine years after the opening of the tapping panel. The agronomic parameters (production, vegetative growth), the tapping panel dryness and those of the latex micro diagnosis were evaluated. The results indicate that these clones independently of the latex harvesting system have good rubber productivity (2310 kg.ha -1.y1) with good radial vegetative growth (2.9 cm.y-1). Their trees show a wellbalanced physiological profile and an acceptable sensitivity to the tapping panel dryness (4.9%). However, the physiological index, the bark consumption and the sensitivity to the tapping panel dryness lead to retain the latex harvesting technologies “ S/2 d3 6d/7 Pa1(1) ET2.5% 4/y and S/2 d4 6d/7 Pa1(1) ET2.5% 4/y ” for the best. This index, favorably influencing the choice of technologies adapted to clones with active metabolism, contributes to the modern and efficient management of a rubber plantation.


Figure 1. HPLC profile of phenolic compounds from petals extract of Hibiscus sabdariffa 
Figure 2. HPLC profile of anthocyanins from petals extract of Hibiscus sabdariffa 
Figure 3. Free radical-scavenging activity of extracts from petals of Hibiscus sabdariffa measured by DPPH assay 
ISSN: 0975-8585 Research Journal of Pharmaceutical, Biological and Chemical Sciences Phytochemical and Antioxidant Activity of Roselle (Hibiscus Sabdariffa L.) Petal Extracts

January 2014

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1,758 Reads

Roselle (Hibiscus sabdariffa L.) is known for delicacy and also for medicinal properties. The present work aim to study the phytochemical screening of Hibiscus sabdariffa for various medicinally important compounds and their quantification. The results showed that alkaloids, anthocyanins, flavonoids, saponins, steroids, sterols and tannins are present in petals of the H. sabdariffa. Anthocyanin content was highest while the contents of phenols and flavonoids were lowest. HPLC analysis revealed two phenolic acids, 16 flavonoids and four anthocyanins in petal of H. sabdariffa. The major compounds were gossypetin, hibiscetin, quercetin and sabdaretin (flavonoids) while delphinidin 3-O-sambubioside and cyanidin 3-O-sambubioside were the major anthocyanins. The antioxidant activity of the investigated extract has a scavenging ability of DPPH radical scavenging activity (around 97 %). The IC 50 values of H. sabdariffa extract was 0.24 mg/ml while that of ascorbic acid used as the reference control was 0.35 mg/ml. This indicated that the compounds constituting mainly petals of H. sabdariffa, such as anthocyanins, flavonoids and phenolic acid contribute to the antioxidative activity. Our findings provide evidence that the petal extract of H. sabdariffa is a potential source of natural antioxidants, and this justify its uses in folkloric medicines.

Citations (3)


... 61 At the same time, tapping alone produces ethylene, a hormone involved in plant wound responses. 65 Thus, ethylene amounts, either endogenous or exogenous ones, affect the rate of latex production along with the growth and anatomical aspects of rubber trees. 65 Applications of methyl jasmonate, jasmonic acid or linolenic acid induce the secondary laticifer differentiation in H. brasiliensis. ...

Reference:

Ethylene and jasmonate as stimulants of latex yield in rubber trees (Hevea brasiliensis): Molecular and physiological mechanisms. A systematic approximation review
Contribution to Natural Rubber Production without Exogenous Hormonal Stimulation

Journal of Experimental Agriculture International

... Higher sucrose levels in the S4 d4 ET3.5%/15d treatment compared to S2 d4 ET 3.5%/15d due to several factors, namely the S2 d4 ET3. 5%/15d using renewable bark (BI-I), the bark has been used when the rubber plant begins to enter the first tapping (B0) and renewable bark is used again 5 years later after entering tapping in the upward direction, renewable bark on quick stater clones (PB 260) is generally thin so that many latex vessel networks are disconnected, less optimum for the sustainability of latex flow a little [18]. This is because the speed of bark regeneration in old plants is slower than in young plants. ...

Improvement of Productivity of the Moderate Metabolism Clone GT 1 of Hevea Brasiliensis Muell. Arg. by Early Upward Tapping in Côte d'Ivoire

American Journal of BioScience

... The latex physiology variables depend on the exploitation and internal condition of the plants (Rukkhun et al., 2020). Dry rubber content is rubber particles while total solid content constitutes rubber, proteins, lipid, sucrose, inorganic phosphorus and thiols in latex (Christophe et al., 2018). Thiol is an enzyme activator and stress indicator and optimal range of thiol is from 0.4 mm -1 to 0.9 mm -1 Inorganic phosphorus is the indicator of metabolic activity and its concentration range lies between 10 to 30 mm and it depends on the latex harvesting techniques (Atsin et al 2017). ...

Latex Micro Diagnosis, Modern Management Tool of Rubber Plantations of Clones With Active or Rapid Metabolism IRCA 18, IRCA 130, PB 235, PB 260 and PB 330

European Scientific Journal