Abstract:
PREMISE OF THE STUDY:Phylogenetic and morphological studies have helped clarify the systematics of large and complex groups such as the tribe Crotoneae (Euphorbiaceae). However, very little is known about the diversity, structure, and function of anatomical features in this tribe. Crotoneae comprises the species-rich pantropical genus Croton and six small neotropical genera. Here we characterized the anatomy of leaf secretory structures in members of this tribe and explored their function and evolutionary significance. METHODS:Young and mature leaves of 26 species were studied using standard anatomical light microscopy techniques. Three sections of Croton and one representative of Brasiliocroton and Astraea were sampled. KEY RESULTS:We identified five types of secretory structures: laticifers, colleters, extrafloral nectaries, idioblasts, and secretory trichomes. Laticifers were present in all species studied except Croton alabamensis, which instead presented secretory parenchyma cells. Articulated laticifers are reported in Crotoneae for the first time. Colleters of the standard type were observed in the majority of the sampled taxa. Extrafloral nectaries were present in section Cleodora and in B. mamoninha, but absent in section Lamprocroton and Astraea lobata. Idioblasts were spread throughout the palisade and/or spongy parenchyma in most of the studied species. Secretory trichomes were restricted to Lamprocroton except for C. imbricatus. CONCLUSIONS:This study revealed a high diversity of secretory structures, including novel ones, in one of the largest clades of Euphorbiaceae. Our results are promising for investigations on the anatomical and ecophysiological bases of species diversification within Euphorbiaceae.
journal_name
Am J Botjournal_title
American journal of botanyauthors
Vitarelli NC,Riina R,Caruzo MB,Cordeiro I,Fuertes-Aguilar J,Meira RMdoi
10.3732/ajb.1500017subject
Has Abstractpub_date
2015-06-01 00:00:00pages
833-47issue
6eissn
0002-9122issn
1537-2197pii
ajb.1500017journal_volume
102pub_type
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doi:
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更新日期:2015-03-01 00:00:00
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更新日期:2012-03-01 00:00:00
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更新日期:2008-06-01 00:00:00
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更新日期:2018-10-01 00:00:00
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更新日期:2020-05-01 00:00:00
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journal_title:American journal of botany
pub_type: 杂志文章
doi:
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doi:
更新日期:1998-04-01 00:00:00
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更新日期:2010-04-01 00:00:00
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journal_title:American journal of botany
pub_type: 杂志文章,评审
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更新日期:2014-12-01 00:00:00
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doi:10.3732/ajb.1100299
更新日期:2012-01-01 00:00:00
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journal_title:American journal of botany
pub_type: 杂志文章
doi:
更新日期:1999-10-01 00:00:00
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journal_title:American journal of botany
pub_type: 杂志文章
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更新日期:2019-12-01 00:00:00
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pub_type: 杂志文章
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journal_title:American journal of botany
pub_type: 杂志文章
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更新日期:2008-12-01 00:00:00
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journal_title:American journal of botany
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更新日期:2012-02-01 00:00:00