Stem anatomy and development of successive cambia in Hebanthe eriantha (Poir.) Pedersen: a neotropical climbing species of the Amaranthaceae

Rajput, Kishore S.; Marcati, Carmen Regina

doi:10.1007/s00606-013-0807-9

Cited by 13 publications

(2 citation statements)

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“…The occurrence of medullary bundles in some members and pattern of secondary growth in Amaranthaceae, Nyctaginaceae, and Chenopodiaceae has always kept these families highlighting in the literature since several years. Therefore, various opinions have been expressed by earlier researchers on nature of the meristem (4,7,(23)(24)(25)(26)(27) and more than 65 terminologies (11) have been proposed to this unique nature of meristem that is responsible for the secondary growth. As documented by earlier researchers for Amaranthaceae, initiation of successive cambia in species investigated here occurs from the parenchyma cells positioned outside to the phloem produced by the previous cambium (4,7,18,24,25).…”

Section: Discussionmentioning

confidence: 99%

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Development of successive cambia and structure of the secondary xylem in some members of the family Amaranthaceae

et al. 2019

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Young stems of Aerva javanica (Burm.f.) Juss. ex Schult., A. lanata (L.) Juss. ex Schult, A. monsonia Mart., A. sanguinolenta (L.) Blume, Alternanthera bettzickiana (Regel) G. Nicholson, A. philoxeroides (Mart.) Griseb., Gomphrena celosioides Mart., G. globosa L. and Telanthera ficoidea (L.) Moq., showed the renewal of small sectors of cambium by replacing with new segments. Therefore, the secondary phloem formed by earlier cambial segments form isolated islands of phloem enclosed within conjunctive tissues became embedded in the secondary xylem. As the stem grows older, complete ring of cambium is renewed; sometimes an anastomosing network of successive cambia may be seen due to the renewal of larger segments of the cambium. Renewal of the cambium takes place by repeated periclinal division in the parenchyma cells positioned outside to the phloem formed by the previous cambium. Functionally the cambium is bidirectional and exclusively composed of fusiform cambial cells. Differentiation of conducting elements of the secondary xylem and phloem remains restricted to the certain cambial cells while rest of the segments exclusively produce conjunctive cells. Accumulation of starch along with the presence of nuclei in the xylem fibers even after deposition of the secondary wall is consistent in all the species and it seems to be associated with the absence of rays in the secondary xylem and phloem of nine species from four genera. The significance of successive cambia, rayless xylem and nucleated xylem fibers were correlated with plant habit.

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Section: Discussionmentioning

confidence: 99%

“…The occurrence of rayless condition in the secondary xylem is unusual in dicots (15,18,(26)(27)(28)(29)(30). The absence of rays in the xylem is correlated with plants that have lost normal cambial activity during the evolution leading towards herbaceous nature (31).…”

Section: Discussionmentioning

confidence: 99%