Internal cambium and intraxylary phloem development in Ipomoea turbinata Lag. (Convolvulaceae)

Rajput, Kishore S.; Gondaliya, Amit D.

doi:10.1016/j.flora.2016.11.002

Cited by 14 publications

(6 citation statements)

References 17 publications

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“…Formation of intraxylary phloem is universal in Convolvulaceae and in most of the members, internal cambium initiates at the pith margin i.e. centrifugally to the intraxylary phloem (8,(11)(12)(13)17,18,25,26,31). In the present study, also observed periclinal divisions at the marginal pith cells between protoxylem and intraxylary phloem and results into a weak cambium (i.e.…”

Section: Discussionsupporting

confidence: 74%

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Formation of medullary phloem in Argyreia nervosa (Burm. f.) Bojer

Kapadane¹,

Shelke

Gondaliya

et al. 2019

Plant Sci. Today

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Histologically, family Convolvulaceae is characterised by the presence of successive cambia, medullary (internal/intraxylary) and interxylary phloem in majority of the species, whereas some of the members are devoid of successive cambia and medullary bundles. The present study on Argyreia nervosa (Burm. f.) Bojer showed the presence of medullary bundles while internal phloem was absent during the primary growth. As the secondary growth progressed, successive cambia initiated from the pericyclic parenchyma. Development of medullary bundles began along with the regular protoxylem and protophloem while formation of intraxylary phloem was observed only after the initiation of secondary growth. Medullary/intraxylary sieve elements began to develop from the marginal pith cells. In thick stems, small segments of internal cambium initiated between the protoxylem and internal phloem. This internal cambium was functionally unidirectional and produced internal phloem centripetally. Developmental particulars are described in details along with its significance.

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Section: Discussionsupporting

confidence: 74%

“…The internal cambium may be functionally unidirectional (producing only phloem) or bidirectional i.e. produce xylem centripetally and phloem centrifugally (12,13,18,31). Handa (32) reported a unique case of unidirectional cambium in Hoya carnosa and Marsdenia tomentosa (s.f.…”

Section: Discussionmentioning

confidence: 99%

Formation of medullary phloem in Argyreia nervosa (Burm. f.) Bojer

Kapadane¹,

Shelke

Gondaliya

et al. 2019

Plant Sci. Today

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“…The stem of I. quamoclit L. subsequently develops lobed, concentric, and diffuse (foraminate) anomalous secondary growth [19]; and I. turbianata Lag. forms internal cambium and intraxylary phloem [7].…”

Section: Introductionmentioning

confidence: 99%

Cambial Variants Combine Successive Cambia and Intraxylary Phloem in Convolvulaceae in Taiwan

Yang¹,

Chen²,

Chen³

2020

AJPS

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Secondary stem growth develops different cambial variants in Convolvulaceae. Here, the cambial variant features of 17 species in seven genera (Convolvulaceae) in Taiwan are presented. The xylem rings produce various successive cambial types and the primary xylem and intraxylary phloem are produced in the outer and inner pith, respectively. The two Argyreia species have round or elliptical stems with continuous secondary xylem and phloem rings. In the eight Ipomoea species, secondary growth has two to four layers of successive cambia and xylem, dispersed with parenchyma tissue, except for

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“…The lengths of the vascular bundles of the main midrib were found to be variable among different J. evolvuloides populations (as was likewise reported for J. nodiflora by Belo et al, 2023). A bicollateral vascular system with intraxylem phloem (Rajput & Gondaliya, 2017; Yang et al, 2020) is commonly observed in Convolvulaceae, with the exception of the genus Cuscuta (Metcalfe & Chalk, 1950). The vascular system of Jacquemontia is collateral, however, which should be further investigated as a potential synapomorphy for the genus.…”

Section: Discussionmentioning

confidence: 99%

Leaf and stem micromorphology of Jacquemontia evolvuloides (Moric.) Meisn. (Convolvulaceae) populations: New insights for taxonomic classification using light and scanning electron microscopy

Belo

Buril

Santos

et al. 2023

Microscopy Res & Technique

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Morphoanatomical studies can provide useful and relevant information to support taxonomic groupings. Jacquemontia evolvuloides shows great morphological variability, which has led to numerous taxonomic classifications. To determine if anatomical characters can be used to recognize operational taxonomic units within populations of that species, we analyzed the leaves and stems of 22 populations using light and scanning electron microscopy. The variability of the analyzed characters allowed the grouping of these populations into five morphotypes. The presence of paracytic stomata, laticiferous canals, and stellate trichomes can be considered diagnostic characters of J. evolvuloides. The presence and types of epicuticular waxes, as well as a layer similar to palisade parenchyma in the petioles and stems, the classifications of glandular trichomes, and new types of stomata (anomocytic, anomotetracytic, and brachyparatetracytic) are reported here for the first time for Jacquemontia. The results discussed here help clarify the classification of this species complex and contribute to the taxonomy of Jacquemontia—a genus that has historically been difficult to define due to its wide morphological variation at the species level.Research Highlights Seven types of epicuticular waxes were identified among J. evolvuloides specimens: granules, threads, entire platelets, coiled rodlets, fissured layers, membranous platelets, and tubules. Six types of trichomes were observed among J. evolvuloides populations: stellate, malpighiaceous, sessile peltate glandular, short pedunculate glandular, stipitate‐glandular, and capitate glandular. We observed that six populations of Jacquemontia evolvuloides located in the Brazilian Caatinga domain have unprecedented sessile peltate trichomes restricted to the main leaf midrib, which were only observed under light microscopy.

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Internal cambium and intraxylary phloem development in Ipomoea turbinata Lag. (Convolvulaceae)

Cited by 14 publications

References 17 publications

Formation of medullary phloem in Argyreia nervosa (Burm. f.) Bojer

Formation of medullary phloem in Argyreia nervosa (Burm. f.) Bojer

Cambial Variants Combine Successive Cambia and Intraxylary Phloem in Convolvulaceae in Taiwan

Leaf and stem micromorphology of Jacquemontia evolvuloides (Moric.) Meisn. (Convolvulaceae) populations: New insights for taxonomic classification using light and scanning electron microscopy

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