Publication: Stem anatomy and development of interxylary phloem in Strychnos bredemeyeri (Loganiaceae)
Authors
Moya, Roger ; Dhanjinbhai Gondaliya, Amit ; Rajput, Kishore Shankarsinh
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Publisher
Universidad de Murcia
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DOI
http://dx.doi.org/10.6018/analesbio.39.08
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info:eu-repo/semantics/article
Description
Abstract
Anatomía del tallo y desarrollo del floema interxilar en Strychnos
bredemeyeri (Loganiaceae)
En Strychnos bredemeyeri, pequeñas porciones de cambium dejan
temporalmente de producir xilema secundario y produce más floema
centrífugamente. Un nuevo segmento del cambium se diferencia
en la parte exterior de este floema formado, entonces estos se
unen al cilindro regular para formar un anillo. Esta repetida actividad
da como resultado la inclusión de islas de floema dentro del xilema
secundario, llamado floema interxilar. Luego aparecen nuevos
elementos del floema asociado al cambium y a las islas de
floema que aplastan los elementos no conductores de islas de
floema. Junto al floema interxilar, el floema intraxilar está formado
por la adición desde las células marginales de la médula. Posteriormente,
pequeños arcos del cambium interno se inician en el
borde interno del protoxilema en tallos gruesos.
Abstract: In Strychnos bredemeyeri small segments of the cambium cease to produce secondary xylem temporarily and produce more phloem centrifugally. A new segment of the cambium differentiates outside to this phloem, which unite with the regular cylinder to form a complete ring by leaving the cambium segment in the furrow. Such repeated activity of cambium results in inclusion of phloem islands within the secondary xylem, called interxylary phloem. New phloem elements added by the cambium associated with phloem islands crush the non-conducting sieve elements in older phloem islands. Beside interxylary phloem, intraxylary phloem is added from the marginal pith cells. Subsequently, small arcs of the internal cambium initiate on the inner margin of the protoxylem in thick stems.
Abstract: In Strychnos bredemeyeri small segments of the cambium cease to produce secondary xylem temporarily and produce more phloem centrifugally. A new segment of the cambium differentiates outside to this phloem, which unite with the regular cylinder to form a complete ring by leaving the cambium segment in the furrow. Such repeated activity of cambium results in inclusion of phloem islands within the secondary xylem, called interxylary phloem. New phloem elements added by the cambium associated with phloem islands crush the non-conducting sieve elements in older phloem islands. Beside interxylary phloem, intraxylary phloem is added from the marginal pith cells. Subsequently, small arcs of the internal cambium initiate on the inner margin of the protoxylem in thick stems.
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Citation
Anales de Biología, nº 39, (2017)
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