Studies on Differentiation of Laticifers through Light and Electron Microscopy in Calotropis gigantea (Linn.) R.Br.

Roy, Ashis Taru; De, Deepesh N.

doi:10.1093/oxfordjournals.aob.a088501

Cited by 18 publications

(9 citation statements)

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“…Embora a grande maioria dos laticíferos já descritos para espécies de Apocynaceae seja considerada do tipo não articulado (Solereder 1908, Metcalfe 1967, Yoder & Mahlberg 1976, Wilson & Mahlberg 1978, Murugan & Inamdar 1987a, b, Inamdar et al 1988, Roy & De 1992, Mahlberg 1993, Appezzato-da-Glória & Estelita 1997), através de análise cuidadosa das terminações dos extensos laticíferos de A. australe e de B. bicuspidatum, constata-se que eles são articulados; as paredes transversais das células que o constituem dissolvem-se rapidamente, não sendo observado sinais de dissolução, logo abaixo de seu ápice. Essa observação difere da interpretação dos laticíferos de Aspidosperma, considerados não articulados (Solereder 1908).…”

Section: Discussionunclassified

“…R. Br. e M. illustris e M. pohliana (Wilson & Mahlberg 1978, Inamdar et al 1988, Roy & De 1992, Appezzato-daGlória & Estelita 1997 e em praticamente todas as peças florais, estando ausentes na antera, óvulo e estigma de Plumeria alba Linn. e Vallaris solanacea (Murugan & Inamdar 1987a, b).…”

Section: Discussionunclassified

“…Eles já foram registrados em órgãos vegetativos e reprodutivos de cerca de 93 gêneros (Solereder 1908, Blaser 1945, Metcalfe & Chalk 1950, Milanez 1960, 1966, 1977, Mahlberg 1961, Yoder & Mahlberg 1976, Wilson & Mahlberg 1978, Murugan & Inamdar 1987a, b, Wilson & Maxam 1987, Inamdar et al 1988, Roy & De 1992, Appezzato-da-Glória & 1.…”

Section: Introductionunclassified

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Laticíferos articulados anastomosados: novos registros para Apocynaceae

Demarco¹,

Kinoshita²,

Castro³

2006

Rev. bras. Bot.

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-(Articulated anastomosing laticifers -new records for Apocynaceae). Laticifer presence is universal in Apocynaceae, in the classic literature the type described for this family is the non-articulated. Later researches have proved the occurrence of articulated laticifers only in four species, giving rise to controversies on their origin. The results obtained in our studies differ from those reported for most species of this family. In both Aspidosperma australe Müll. Arg. (Rauvolfioideae) and Blepharodon bicuspidatum Fourn. (Asclepiadoideae), the laticifers are of the articulated anastomosing type because they are formed by adding cells with rapidly dissolving transverse walls. Laticifers originate from ground meristem and/or procambium and form a branched system, they are in secretory phase since the early stages of formation in different organs, releasing latex only when the plant is damaged. The laticifer walls are exclusively pectic-cellulosic and their chemical characteristics probably change during their development. Vegetative organ laticifers occur in all stem and leaf tissues, except epidermis and medullary parenchyma of A. australe. In the flower, laticifers are found in all floral organs, except in the medullary parenchyma of the pedicel of A. australe and in the ovules of both species. The presence of the same type of laticifer in these two genera, which represent the most divergent subfamilies within the Apocynaceae corroborates the current circumscription of this family. The latex has protective function, allowing the species of this family to succeed in different environments.Key words -anatomy, Apocynaceae, articulated laticifers, distribution, ontogeny RESUMO -(Laticíferos articulados anastomosados -novos registros para Apocynaceae). A presença de laticíferos é universal nas Apocynaceae e o tipo descrito nas obras clássicas de revisão para esta família é o não articulado. Pesquisas posteriores provaram a ocorrência de laticíferos articulados apenas em quatro espécies, suscitando controvérsias quanto à sua origem. Os resultados obtidos em nossos estudos divergem dos já publicados para a maioria das espécies da família. Tanto em Aspidosperma australe Müll. Arg. (Rauvolfioideae) quanto em Blepharodon bicuspidatum Fourn. (Asclepiadoideae), os laticíferos são articulados anastomosados e formados por adição de células, cujas paredes transversais dissolvem-se rapidamente. Eles originam-se a partir do meristema fundamental e/ou procâmbio, já estão em fase secretora desde o início de sua formação nos diferentes órgãos, constituindo um sistema ramificado e só liberam o látex se a planta for injuriada. As paredes dos laticíferos são exclusivamente pectocelulósicas e suas características químicas provavelmente se alteram durante o seu desenvolvimento. Os laticíferos dos órgãos vegetativos ocorrem em todos os tecidos do caule e da folha, com exceção da epiderme e do parênquima medular de A. australe. Na flor, eles são encontrados em todas as peças florais, exceto no parênquima medular do pedicelo de...

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Section: Discussionunclassified

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Laticíferos articulados anastomosados: novos registros para Apocynaceae

Demarco¹,

Kinoshita²,

Castro³

2006

Rev. bras. Bot.

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“…The degradation of reserve materials and proliferation of RER and vacuoles, as observed in laticifers in T. catharinensis embryos, have also been reported in articulated laticifers in mature embryos of other Apocynaceae species (Milanez 1959(Milanez , 1977. A well-developed central vacuole and peripheral cytoplasm, as observed in the differentiated laticifers of T. catharinensis plants, have frequently been reported in both articulated and nonarticulated laticifers in different taxa (Nessler and Mahlberg 1977;Milanez 1977;Mahlberg 1978, 1980;Condon and Fineran 1989;Roy and Deepsh 1992;Nessler and Monacelli et al 2005;Gama et al 2017). The dilation of regions of the RER in T. catharinensis laticifers contributes to vacuole development, as reported for other latex-bearing plants (Nessler and Mahlberg 1977;Mahlberg 1978, 1980;Cai et al 2009).…”

Section: Discussionmentioning

confidence: 60%

Cytological differentiation and cell wall involvement in the growth mechanisms of articulated laticifers in Tabernaemontana catharinensis A.DC. (Apocynaceae)

et al. 2018

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The cellular mechanisms of laticifer growth are of particular interest in plant biology but are commonly neglected. Using transmission electron microscopy and immunocytochemical methods, we recorded cytological differentiation and evaluated the cell wall involvement in the growth of articulated laticifers with intrusive growth in the mature embryo and plant shoot apex of Tabernaemontana catharinensis. The incorporation of adjacent meristematic cells into the laticifer system occurred in the embryo and plant shoot apex, and the incorporated cells acquired features of laticifer, confirming the laticifers' action-inducing mechanism. In the embryo, this was the main growth mechanism, and began with enlargement of the plasmodesmata and the formation of pores between laticifers and meristematic cells. In the plant shoot apex, it began with loose and disassembled walls and the reorientation of the cortical microtubules of the incorporated cell. Plasmodesmata were absent in these laticifers. There was stronger evidence of intrusive growth in undifferentiated portions of the plant shoot apex than in the embryo. The numerous plasmodesmata in laticifers of the embryo may have been related to the lower frequency of intrusive growth. Intrusive growth was associated with presence of arabinan (increasing wall flexibility and fluidity), and absence of galactan (avoiding wall stiffness), and callose (as a consequence of reduction in symplastic connections) in the laticifer walls. The abundance of low de-methyl-esterified homogalacturonan in the middle lamella and corners may reestablish cell-cell bonding in the laticifers. The cell wall features differed between embryo and plant shoot apex and are directly associated to laticifer growth mechanisms.

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“…It is well documented that non-articulated, branched laticifers develop from single initials or primordia during development of the embryo, and then elongate as the plant grows (Mahlberg 1961(Mahlberg , 1963Cass 1985;Murugan & Inamdar 1987;Rudall 1987Rudall , 1994; Van Veenendaal & Den Outer 1990;Roy & De 1992;Da Cunha et al 1998). It generally is presumed that the laticifers penetrate the rays from the pith (Evert 2006).…”

Section: Resultsmentioning

confidence: 99%

Laticifers of Ficus Carica and Their Potential Role in Plant Defense

Kajii¹,

Morita²,

Kuroda³

2014

IAWA J

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The distribution and structure of laticifers in Ficus carica L. were investigated in a current-year branch and an 8-year-old trunk, using serial sections stained with safranin-fast green or nile blue. In the 8-year-old trunk, laticifers were found not only in the cortex, secondary phloem, and pith, but also in the secondary xylem. The laticifers in the phloem and xylem were of the branched, non-articulated type. In addition, horizontal laticifers extending from the phloem through the cambium to the xylem were found in some rays. Laticifers penetrating the cambial initial layer elongated in the cambial zone without cell division. Activation of latex production occurred after wounding of cortex and phloem, and the latex exuded from the cut site of laticifers into the surrounding wounded tissue and broken cells. The potential role of laticifers in defense of F. carica against certain pathogens is discussed.

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Studies on Differentiation of Laticifers through Light and Electron Microscopy in Calotropis gigantea (Linn.) R.Br.

Cited by 18 publications

References 0 publications

Laticíferos articulados anastomosados: novos registros para Apocynaceae

Laticíferos articulados anastomosados: novos registros para Apocynaceae

Cytological differentiation and cell wall involvement in the growth mechanisms of articulated laticifers in Tabernaemontana catharinensis A.DC. (Apocynaceae)

Laticifers of Ficus Carica and Their Potential Role in Plant Defense

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