Comparative systematic study of colleters and stipules of Rhizophoraceae with implications for adaptation to challenging environments

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2013
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Sheue, Chiou-Rong
Chesson, Peter
Chen, Ying-Ju
Wu, Szu-Yang
Wu, Yeh-Hua
Yong, Jean W. H.
Guu, Te-Yu
Lim, Chung-Lu
Randrianasolo, Razafiharimina Marie Agnes
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Colleters are multicellular secretory structures found on various organs in flowering plants. Colleters on the adaxial sides of stipules have been hypothesized to play a role in protecting the developing shoot. Rhizophoraceae is a stipulate family with a broad distribution from mangrove to montane environments, which makes the family well suited for the examination of this hypothesis, but the colleters of Rhizophoraceae are not well known. We compared species from all three tribes of Rhizophoraceae, including five inland genera and all four mangrove genera. In all species, several to hundreds of colleters, sessile or stalked, arranged in rows aggregated in genus-specific shapes, are found at the adaxial bases of open and closed stipules. Pellacalyx uniquely has additional colleters at the stipule margins. Colleters are all of the standard type, comprising a central axis of core parenchyma with large vacuoles and tannins, and an outer palisade-like epidermis with organelles involved in secretory activity. An exception is Pellacalyx axillaris, in which colleters appear as extremely small epidermal protrusions. Kandelia obovata has a tracheary element in some colleters. Pellacalyx uniquely has an unusual fleshy outgrowth on the adaxial stipule base. We propose an evolutionary sequence in which Macarisia has plesiomorphic stipule and colleter traits and the mangrove Kandelia obovata with colleter vascular traces is most derived. Colleter and stipule structures are largely concordant with habitat and phylogeny, and show taxonomic value. The strong alignment of colleter and stipule patterns with habitat is suggestive that colleters have a protective function, although some components of these patterns may be phylogenetically determined.

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570 Biowissenschaften, Biologie
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Cassipourea, fleshy outgrowth, Gynotroches, Kandelia, Macarisia, mangroves, Pellacalyx, standard type, ultrastructure
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ISO 690SHEUE, Chiou-Rong, Peter CHESSON, Ying-Ju CHEN, Szu-Yang WU, Yeh-Hua WU, Jean W. H. YONG, Te-Yu GUU, Chung-Lu LIM, Razafiharimina Marie Agnes RANDRIANASOLO, Mialy RAZANAJATOVO, Yuen-Po YANG, 2013. Comparative systematic study of colleters and stipules of Rhizophoraceae with implications for adaptation to challenging environments. In: Botanical Journal of the Linnean Society. 2013, 172(4), pp. 449-464. ISSN 0024-4074. eISSN 1095-8339. Available under: doi: 10.1111/boj.12058
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@article{Sheue2013Compa-25631,
  year={2013},
  doi={10.1111/boj.12058},
  title={Comparative systematic study of colleters and stipules of Rhizophoraceae with implications for adaptation to challenging environments},
  number={4},
  volume={172},
  issn={0024-4074},
  journal={Botanical Journal of the Linnean Society},
  pages={449--464},
  author={Sheue, Chiou-Rong and Chesson, Peter and Chen, Ying-Ju and Wu, Szu-Yang and Wu, Yeh-Hua and Yong, Jean W. H. and Guu, Te-Yu and Lim, Chung-Lu and Randrianasolo, Razafiharimina Marie Agnes and Razanajatovo, Mialy and Yang, Yuen-Po}
}
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