March 2022
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3 Reads
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March 2022
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3 Reads
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.
February 2021
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144 Reads
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2 Citations
American Journal of BioScience
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.
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.
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.
... 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. ...
August 2021
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. ...
February 2021
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). ...
January 2018
European Scientific Journal