Stem anatomy and development of interxylary phloem in Strychnos bredemeyeri (Loganiaceae)

Moya, Róger; Gondaliya, Amit D.; Rajput, Kishore S.

doi:10.6018/analesbio.39.08

Cited by 9 publications

(10 citation statements)

References 20 publications

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“…S. innocua grows in a drier ecological region and will be faced with the challenge of conserving water and will probably be at an advantage with multiple vessels. Moya et al (2017) in their study of S. bredemeyeri from Costa Rico also observed the occurrence of solitary vessels and those in radial and diagonal multiples.…”

Section: Discussionmentioning

confidence: 89%

“…S. innocua has rays with 1-3 seriate, while S. usambarensis has rays wider than 4-seriate. Moya et al (2017) observed rays that were 2-to many celled wide being mixed up with few uniseriate rays in S. bredemeyeri that they studied. According to Evert (2006), the possession of wide rays is equally of importance in strengthening a plant.…”

Section: Discussionmentioning

confidence: 96%

“…The possession of vessels in radial and tangential directions occurring together with solitary vessels is a feature common to members of Loganiaceae (Krukoff and Munachino, 1942;Mennega, 1980;Dayal et al, 1984;Metcalfe and Chalk, 1989;Moya et al, 2017). Also the possession of vessels that are round in transaction is a feature of Loganiaceae (Carlquist, 1984;Metcalfe and Chalk, 1989).…”

Section: Discussionmentioning

confidence: 99%

“…S. spinosa lacks interxylary phloem while S. innocua and S. usambarensis possess it. Moya et al (2017) noted that the possession of interxylary phloem is restricted to small number of dicotyledonous taxa and mentioned that it has been reported in many species of Strychnos. This is the first time the possession of interxylary phloem is being reported in S. innocua and S. usambarensis.…”

Section: Discussionmentioning

confidence: 99%

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Studies of the wood of some Nigerian alkaloid-rich Strychnos species

Uchechukwu¹,

Obiageli²

2020

J. Hortic. For.

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The wood of three Nigerian species of Strychnos Linn. growing in different ecological zones was studied. The transverse, transverse longitudinal and radial longitudinal sections of the wood were made with sliding sledge microtome. The wood was macerated to measure its fiber and vessel dimensions. The wood was diffusing porous and intraxylary phloem occurred in the three species. Interxylary phloem in discontinuous ring occurred in the xylem cylinder of Strychnos innocua Del. and Strychnos usambarensis Gilg. Parenchyma was paratracheal and formed aliform to confluent patterns in S. spinosa Lam. but scanty in S. innocua and S. usambarensis. Vessel elements occurred singly and in radial and tangential multiples of two to four. The fiber lumen dimension of S. spinosa had the least value while its fiber cell wall thickness also had the greatest value. In S. spinosa, alkaloids and sterols were detected in the leaves and stem extracts. Alkaloids were found in the leaves, stem bark and fruits of S. usambarensis. The micro morphological features in each species were useful in making them adapt to the climatic conditions of the ecological zones where they grow.

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Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Studies of the wood of some Nigerian alkaloid-rich Strychnos species

Uchechukwu¹,

Obiageli²

2020

J. Hortic. For.

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“…Previous anatomical descriptions of the stems of large bodied vines belonging to Loganiaceae, Malpighiaceae, Bignoniaceae, Fabaceae or Sapindaceae emphasize novel topologies with distinctive cambia: anomalous phloem architectures that evolved with the scandent habit and represent traits that associate with both higher flexibility and resilience to damage (Ewers and Fisher, 1991; Fisher and Blanco, 2014; Moya et al, 2017; Pace et al, 2011; 2015; 2018; Chery et al, 2020). Only a handful of works address structural variation of the sieve tube elements in relation to axial transport in lianas.…”

Section: Introductionmentioning

confidence: 99%

Sieve tube structural variation inAustrobaileya scandensand its significance for lianescence

Losada

Holbrook

2021

Preprint

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Lianas are characterized by large leaf areas and slender stems, a combination of features that require an efficient vascular system. The only extant member of the Austrobaileyaceae, is an endemic twining liana of the tropical Australian forests with well-known xylem hydraulic traits. However, the vascular phloem continuum through aerial organs remains understudied. We analyzed the structure of phloem conduits across leaf veins and stems of A. scandens, combining topological data obtained through light and electron microscopy, with current models of phloem transport. Leaves displayed a low xylem to phloem ratio compared with leaves of other angiosperms, with vascular elements invariant in diameter along the midrib, but tapered across vein hierarchies. Sieve plate pore radii were extremely small: 0.08μm in minor veins, increasing to 0.12μm in the petiole and only to 0.20μm at the base of the stem, tens of meters away. Searcher branches contained tube shaped phloem conduits with a pectin-rich wall, whereas twining stems displayed sieve elements with tangential connections that displayed a greater fraction of the tubes populated with an astonishing number of sieve plates. Hydraulic segmentation of the leaves in Austrobaileyaceae correlate with vesseless leaves that benefit photoassimilate export through volumetric scaling of the sieve tube elements. Yet, compared with canopy dominant trees, the geometrical properties of the sieve tube in twining stems, restrict considerably energy distribution in the sub-canopy layers, potentially favoring the allocation of assimilates toward the elongating branches. Thus, the conductive xylem of twining stems contrasts with a poorly conductive phloem that meets the mechanical constraints of lianescence.

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