The Role of Abscission during Leaflet Separation in<i>Chamaedorea elegans</i>(Arecaceae)

Nowak, Julia; Dengler, Nancy G.; Posluszny, Usher

doi:10.1086/513489

Cited by 10 publications

(14 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By using the methods listed above and following many of the simple techniques mentioned by Tomlinson et al (2011), rapid results can be achieved in a laboratory provided with only the simplest equipment. This simple approach was also successfully used in a significant study of palm leaf development by Nowak et al (2007).…”

Section: Methodsmentioning

confidence: 99%

Leaflet anatomy verifies relationships within Syagrus (Arecaceae) and aids in identification

Noblick¹

2013

PHYTOKEYS

View full text Add to dashboard Cite

The current investigation was carried out to examine how palm anatomy may coincide with the current molecular analysis including the three recognized clades of Syagrus Mart. and to justify the splitting of acaulescent Syagrus species (e.g. Syagrus petraea (Mart.) Becc.) into several species. Free-hand cross-sections of leaflets were made and the comparison of these verifies the relationships suggested by the molecular data. Free-hand leaflet sections were also found to be useful in the identification of otherwise difficult-to-identify acaulescent Syagrus species. The result and conclusion is that anatomical data is valuable in helping to verify molecular data and that splitting the acaulescent species of Syagrus is justified by the differences discovered in their field habit and anatomy. These differences were used to produce an identification key that is based on the anatomy.

show abstract

Section: Methodsmentioning

confidence: 99%

Leaflet anatomy verifies relationships within Syagrus (Arecaceae) and aids in identification

Noblick¹

2013

PHYTOKEYS

View full text Add to dashboard Cite

show abstract

“…As a result, mechanical forces eventually separate the leaflets as they expand, to form pinnately compound leaves. This cell reduction is not achieved by PCD or necrosis, but probably by an abscission‐like degradation of the middle lamella (Nowak et al ., ). Furthermore, PCD is implicated in the dissection of Monstera leaves, wherein PCD causes perforations early during leaf expansion, and these perforations are enlarged as the leaf grows (Fig.…”

Section: Leaf Architecturementioning

confidence: 97%

“…KNOX expression is found in some palm plications, suggesting a blastozone fractionation‐like mechanism (Jouannic et al ., ). However, KNOX expression is not universal in the compound leaves of all palms (Nowak et al ., ) and, similarly, is not universal in eudicots. In the case of pea and Medicago truncatula , instead of KNOX reactivation, orthologs of LEAFY ( LFY ) are expressed in marginal blastozones (Hofer et al ., , ; Gourlay et al ., ; Champagne et al ., ; Wang et al ., ).…”

Section: Leaf Architecturementioning

confidence: 99%

See 1 more Smart Citation

On the mechanisms of development in monocot and eudicot leaves

Conklin

Strable

et al. 2018

New Phytologist

View full text Add to dashboard Cite

Contents Summary I. Introduction II. Leaf zones in monocot and eudicot leaves III. Monocot and eudicot leaf initiation: differences in degree and timing, but not kind IV. Reticulate and parallel venation: extending the model? V. Flat laminar growth: patterning and coordination of adaxial-abaxial and mediolateral axes VI. Stipules and ligules: ontogeny of primordial elaborations VII. Leaf architecture VIII. Stomatal development: shared and diverged mechanisms for making epidermal pores IX. Conclusion Acknowledgements References SUMMARY: Comparisons of concepts in monocot and eudicot leaf development are presented, with attention to the morphologies and mechanisms separating these angiosperm lineages. Monocot and eudicot leaves are distinguished by the differential elaborations of upper and lower leaf zones, the formation of sheathing/nonsheathing leaf bases and vasculature patterning. We propose that monocot and eudicot leaves undergo expansion of mediolateral domains at different times in ontogeny, directly impacting features such as venation and leaf bases. Furthermore, lineage-specific mechanisms in compound leaf development are discussed. Although models for the homologies of enigmatic tissues, such as ligules and stipules, are proposed, tests of these hypotheses are rare. Likewise, comparisons of stomatal development are limited to Arabidopsis and a few grasses. Future studies may investigate correlations in the ontogenies of parallel venation and linear stomatal files in monocots, and the reticulate patterning of veins and dispersed stoma in eudicots. Although many fundamental mechanisms of leaf development are shared in eudicots and monocots, variations in the timing, degree and duration of these ontogenetic events may contribute to key differences in morphology. We anticipate that the incorporation of an ever-expanding number of sequenced genomes will enrich our understanding of the developmental mechanisms generating eudicot and monocot leaves.

show abstract

“…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%

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

Barabé

Bourque

Yin

et al. 2010

Botany

View full text Add to dashboard Cite

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.

show abstract

The Role of Abscission during Leaflet Separation inChamaedorea elegans(Arecaceae)

Cited by 10 publications

References 22 publications

Leaflet anatomy verifies relationships within Syagrus (Arecaceae) and aids in identification

Leaflet anatomy verifies relationships within Syagrus (Arecaceae) and aids in identification

On the mechanisms of development in monocot and eudicot leaves

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

Contact Info

Product

Resources

About