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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The role of non-glandular emergences in Croton floribundus (Euphorbiaceae) upon elevated ozone exposures

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Dias, Marcia Goncalves [1] ; Moura, Barbara Baesso [2] ; Pedrosa, Giselle da Silva [3, 4] ; de Souza, Silvia Ribeiro [4] ; Cardoso-Gustavson, Poliana [3, 5]
Total Authors: 5
[1] Univ Sao Paulo, Dept Ciencias Biol, BR-13418900 Piracicaba - Brazil
[2] Univ Florence, Dept Agrifood Prod & Environm Sci, Florence - Italy
[3] Univ Fed ABC, Ctr Ciencias Nat & Humanas, Sao Bernardo Do Campo - Brazil
[4] Nucleo Pesquisa Ecol, Inst Bot, Sao Paulo, SP - Brazil
[5] R&D Agrochem, Oxiteno - Brazil
Total Affiliations: 5
Document type: Journal article
Source: NORDIC JOURNAL OF BOTANY; v. 37, n. 11 NOV 2019.
Web of Science Citations: 0

A role of non-glandular emergences in avoiding ozone (O-3) damages by preventing its entrance into leaf tissues has been suggested in the O-3-tolerant species Croton floribundus (Euphorbiaceae). However, this function against O-3 damage has been underestimated due to the covering wax layer, mostly composed of saturated hydrocarbon, which has low O-3 reactivity. To evaluate the role of these emergences in conferring tolerance to O-3, we mechanically removed the non-glandular emergences from leaf blades of C. floribundus, submitted the plants to acute O-3 fumigation, and assessed morphological and microscopic alterations. Plants with intact leaves treated with O-3 showed the same phenotype as control samples but showed microscopic indicators of accelerated senescence. These alterations indicated a whole-plant response to O-3. In contrast, plants whose leaves had got their emergences removed exhibited specific morphological symptoms as well as microscopic O-3 damage. We thus conclude that the leaf emergences constitute a barrier for volatile contention, preventing O-3 damage to leaf tissues in C. floribundus. When these structures have been removed, defense volatiles are possibly quickly dispersed, makes this species vulnerable to O-3. This study highlights the relevance of surface structures for plant resistance to O-3 damages, complementing biochemical defenses. (AU)

FAPESP's process: 12/11663-8 - Atmospheric ozone action on multiple functions of volatile organic compounds from native plants
Grantee:Silvia Ribeiro de Souza
Support Opportunities: Regular Research Grants