The Apical Organization and Phyllotaxis of the Oil Palm

Rees, A. R.

doi:10.1093/oxfordjournals.aob.a083895

Cited by 28 publications

(23 citation statements)

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“…58) is higher than that reported for the palm Elaeis guineensis (1.06-1.11), which is also characterized by a (2, 3) phyllotactic system (Rees 1964). This indicates that in palms the number of conspicuous parastichies and the value of the radial plastochrone ratio are not closely correlated.…”

Section: Plastochrone Ratiocontrasting

confidence: 56%

“…Although we did not measure the plastochrone in real time in E. oleracea, it was reported that it takes about 17 d between the formation of two successive leaves in the palm Elaeis guineensis Jacq. (Rees 1964). We can reasonably hypothesize that the time between the formation of two successive leaves in Euterpe is in the same order of magnitude as that of Elaeis.…”

Section: Plastochrone Ratiomentioning

confidence: 70%

“…In Euterpe, the value of the leaf arc (near 3608), and G (yp to 3.8), because of the fact that the thick leaf base completely surrounds the apex, correspond to that of a distichous system. If we accept the hypothesis formulated above that the time between the formation of two successive leaves in Euterpe is in the same order of magnitude as that of Elaeis (Rees 1964), the long delay between the formation of two successive primordia is linked to the formation of an extensive area of insertion of the leaf around the apex, which corresponds to a high value of G.…”

Section: Plastochrone Ratiomentioning

confidence: 83%

“…The possible relationship between the chirality of palms and latitude and geomagnetic field has also been analysed by various authors (e.g., Davis and Davis 1987;Minorsky 1998;Minorsky and Bronstein 2006). Comparatively, there are very few studies dealing with the geometry of the shoot apical meristem (Ball 1941;Rees 1964). Although the development of palm leaves has been studied in detail (Padmanabhan and Veerasamy 1974;Dengler et al 1982;Rich et al 1995;Scanlon 2000;Nowak et al 2007) the phyllotactic organisation at the level of the shoot tip remains relatively unknown.…”

Section: Introductionmentioning

confidence: 99%

“…Rees (1964) used the method of Richards (1951) to investigate the apical organization and phyllotaxis of the oil palm (Elaeis guineensis). He reported a phyllotactic system of (2, 3) conspicuous parastichies pairs and a plastochrone ratio ranging from 1.059 to 1.110.…”

Section: Introductionmentioning

confidence: 99%

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Phyllotaxis of the palmEuterpe oleraceaMart. at the level of the shoot apical meristem

Barabé

Bourque

Yin

et al. 2010

Botany

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Previous studies on palm phyllotaxis deal mainly with the mature trunk. The goals of this study are (i) to determine the relationship between the number of parastichies, the divergence angle, and the plastochrone ratio at the level of the shoot apical meristem; (ii) to examine whether there are fluctuations in the divergence angle; (iii) to interpret the significance of phyllotactic parameters with respect to the mode of growth of the apex. The tubular base of the leaf primordium is more or less asymmetrical, and completely surrounds the shoot apical meristem. The phyllotactic system corresponds to a (2, 3) conspicuous parastichy pair. The mean divergence angle per apex varies between 126.98 ± 9.38 (mean ± SD) and 135. 88 ± 8.08. Divergence angles for all apices fluctuate within a range of 115.898 to 157.338. The mean plastochrone ratios between apices varies from 1.35 ± 0.18 to 1.58 ± 0.12. The plastochrone ratio at each plastochrone for all apices ranges from 1.09 to 2.00. There is no correlation between the angle of divergence and the plastochrone ratio. There is a fluctuation in the value of the divergence angle that falls within the range predicted by the fundamental theorem of phyllotaxis. The high value of the ratio of the diameter of leaf primordia over the diameter of the apex, and the long plastochrone might explain the lack of correlation between certain phyllotactic parameters.Résumé : Des études précédentes ont porté sur la phyllotaxie de palmier, mais surtout chez des tiges adultes. Le but de cette étude est de (i) déterminer la relation entre le nombre de parastiches, l'angle de divergence et le ratio du plastochrone, à la hauteur du méristème apical de la tige; (ii) de vérifier s'il y a des fluctuations dans l'angle de divergence; (iii) d'interpréter la signification des paramètres phyllotaxiques en relation avec le mode de croissance apicale. La base tubulaire du primordium foliaire est plus ou moins asymétrique et entoure complètement le méristème apical de la tige. Le système phyllotaxique correspond à une (2, 3) paire bien visible de parastiches. L'angle moyen de divergence par apex varie entre 126,98 ± 9,38 (moyenne ± DS) et 135,88 ± 8,08. La divergence des angles pour tous les apex fluctue régulièrement entre 115,898 et 157,338. Les ratios des plastochrones moyens entre les apex varient entre 1,35 ± 0,18 et 1,58 ± 0,12. Le ratio du plastochrone à chacun des plastochrone pour tous les apex va de 1,09 à 2,00. Il n'y a pas de corrélation entre l'angle de divergence et le ratio du plastochrone. On observe une fluctuation dans la valeur de l'angle de divergence qui se situe dans l'écart prédit par le théorème fondamental de la phyllotaxie. La valeur élevée du ratio du diamètre du primordium foliaire sur le diamètre de l'apex et le long plastochrone pourrait expliquer l'absence de corrélation entre certains paramètres phyllotaxiques.

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Section: Plastochrone Ratiocontrasting

confidence: 56%

Section: Plastochrone Ratiomentioning

confidence: 70%

Section: Plastochrone Ratiomentioning

confidence: 83%