Clonal stability of tree dryness in Hevea brasiliensis Muell. Arg.

Omokhafe, K.O.

doi:10.1590/s1415-47572004000200019

Cited by 11 publications

(6 citation statements)

References 5 publications

(5 reference statements)

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“…They show that IRCA 41 clone is very little sensitive to TPD and the most sensitive clones are PB 260 and PB 235. The difference of clones' TPD sensitivity was indicated by De Fay (1981), Chrestin (1985), Omokhafe (2001) and Omokhafe (2004) on limited number of clones who are GT 1, PR 107, PB 235 and RRIM 600. The relatively raised number of clones used in the present study (13 clones) demonstrates the importance of the genetic factor on the clones' sensitivity to TPD.…”

Section: Discussionmentioning

confidence: 98%

Seasonal variation of tapping panel dryness expression in rubber tree Hevea brasiliensis muell. arg. in Cote d’ivoire

Okoma¹,

Dian²

2011

ABJNA

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In rubber tree, Hevea brasiliensis, latex production is affected by tapping panel dryness characterized by non exudation of latex from the panel after tapping. The present study shows the sensitivity level of the more planted clones and the influence of climatic factors on the development of tapping panel dryness in Côte d'Ivoire. The lengths of sick panels were measured and the meteorological summaries carrying on the rainfall and the temperature have been made. Analysis of variance and comparison of the lengths of sick panel in relation to rainfall and temperature have been made. The results showed that Hevea brasiliensis clones have not the same sensitivity to tapping panel dryness. IRC A41, PB 217, AF 261 and RRIM 712 clones are little sensitive; IRCA 130, AVROS 2037, IRCA 209 and GT 1, are fairly sensitive whereas RRIC 100, IRCA 230, PB 254, PB 260 and PB 235 appear enough susceptible to tapping panel dryness. They also showed that the expression of tapping panel dryness varies seasonal way and is positively correlated to the water deficit and to the temperature. The less hot period from July to December corresponds to favorable period of rubber tree to better produce latex in stimulation conditions.

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Section: Discussionmentioning

confidence: 98%

Seasonal variation of tapping panel dryness expression in rubber tree Hevea brasiliensis muell. arg. in Cote d’ivoire

Okoma¹,

Dian²

2011

ABJNA

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“…Indeed, the results showed that clones IRCA 331 and GT1 were among the clones having obtained the lowest average rates of diseased tapping cut length. Several authors [12,35,36,37] have reported that tapping panel dryness rate increases with the frequency of stimulation. This suggests that these clones could better bear the applied stimulation regime compared to clones PB 310, IRCA 707, IRCA 202, and PB 280 that were sensitive to one or the other of the major factors of stand reduction.…”

Section: Discussionmentioning

confidence: 99%

Agronomic Performance of Hevea brasiliensis Muell. Arg. Clone IRCA 331 Grown in Southwestern Côte d'Ivoire

Elabo¹,

Atsin

Soumahin

et al. 2019

AJRAF

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In order to test the agronomic performance of the newly developed clones, a Large-Scale Clone Trial (LSCT) comprising Hevea brasiliensis clones GT 1, IRCA 202, IRCA 331, IRCA 707, PB 280 and PB 310 was established in southwestern Côte d'Ivoire. They were planted in completely randomized blocks with six clone treatments and four replications of 112 trees per clone. The measured parameters included isodiametric growth of the trunk, rubber yield, trees stand, latex physiological parameters and sensitivity to tapping panel dryness (TPD). Collected data was analyzed using Statistica 7.0 statistical software. After ten years of downward tapping and four years of upward tapping, clone IRCA 331 showed significantly higher rubber productivity than all other clones. Its productivity gain, relative to the reference control GT 1, was 63% in downward tapping and 80% in upward tapping. Despite its high level of productivity, the annual rate of isodiametric growth of clone IRCA 331 tree trunks (2.56 cm/year) remained statistically equivalent to that of clone GT 1 (2.62 cm/year) at latex harvesting stage. In addition, the physiological profile of clone IRCA 331 was good and similar to that of the control. Clones IRCA 331, GT1 and PB 280 got the lowest sensitivity to TPD. However, only clones GT1 and IRCA 331 maintained a good stand of tappable trees throughout the experimental period. This experiment highlighted the agronomic performance of the clone IRCA331 and allowed to put it in class 1. Clone IRCA 331 can therefore be used as a clone of first choice to improve national productivity.

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“…Rubber (Hevea brasiliensis Muell, Arg. ), Belonging to the Euphorbiaceae family, which is almost exclusively grown for its latex which is the main source of natural rubber [1][2][3][4][5]. Natural rubber is an important raw material in industry.…”

Section: Introductionmentioning

confidence: 99%

Relationship between the Intensity of Latex Harvesting and the Tapping Panel Dryness Expression of Clone GT 1 of Hevea brasiliensis Muell Arg in South-East Côte d'Ivoire

Obouayeba

Djézou

Moussa

et al. 2021

JABB

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Tapping panel dryness is an important limiting factor in rubber productivity of Hevea brasiliensis. In order to assess the sensitivity to this syndrome, the effect of two intensive latex harvesting technologies on moderately metabolized GT1 clone, has been studied in the South-Eastern region of Côte d'Ivoire. The rubber trees were planted according to the experimental mono-tree device, "One tree one plot design" a tree constituting a repetition, and 31 trees per treatment, selected on circumference and health status criteria. The parameters measured were rubber production, circumference increase, physiological profile and tapping panel dryness sensitivity. The results showed that induction of tapping panel dryness in latex harvesting system, S/2 d/3 6d/7 ET 10 % Pa 1 (1) 1/ w) was significantly low (0.18 ± 0,22 %) than that of the control (S d/1 6d/7 unstimulated, 1.43 ± 1.45 %). Productivity of this particular system was also good (62 ± 16.32 g.a-1.s-1) and it especially has less stress that can cause physiological fatigue, or even the notch dry. Otherwise, Rubber production, radial vegetative growth, physiological parameters of the latex and the tapping panel dryness rate were influenced by the two treatments applied to GT 1. In addition, the medium and high sucrose contents (16.5 ± 3.01%) and thiol group (0.51 ± 0.13 mmol.l-1) of the latex in the treatment (S/2 d/3 6d/7 ET 10% Pa 1 (1) 1 / w), were instrumental in the response to this stimulation. The sensitivity to the tapping panel dryness is in very close linear relation with the harvest intensity of the latex to which the GT 1 clone has been subjected. These results corroborate and confirm the moderate sensitivity to the tapping panel dryness of GT 1 clone.

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Clonal stability of tree dryness in Hevea brasiliensis Muell. Arg.

Cited by 11 publications

References 5 publications

Seasonal variation of tapping panel dryness expression in rubber tree Hevea brasiliensis muell. arg. in Cote d’ivoire

Seasonal variation of tapping panel dryness expression in rubber tree Hevea brasiliensis muell. arg. in Cote d’ivoire

Agronomic Performance of Hevea brasiliensis Muell. Arg. Clone IRCA 331 Grown in Southwestern Côte d'Ivoire

Relationship between the Intensity of Latex Harvesting and the Tapping Panel Dryness Expression of Clone GT 1 of Hevea brasiliensis Muell Arg in South-East Côte d'Ivoire

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