Physiological traits and antioxidant metabolism of leaves of tropical woody species challenged with cement dust

Abstract

Tropical woody species occurring in limestone outcrops are frequently exposed to particulate material from cement factories. The effects of 60-day cement dust exposure on physiological traits and enzymatic antioxidant system of young plant leaves of Guazuma ulmifolia Lam., Myracrodruon urundeuva Allemão and Trichilia hirta L. were investigated. Cement dust (2.5 or 5mgcm) was applied to the leaf surface or soil or both (leaf plus soil) and plants were maintained at greenhouse. Cement dust barely affected the mineral nutrient levels, except for iron whose content was decreased in leaves/leaflets of all species studied. The incident light was partly blocked in cement dust-treated leaves, regardless of the plant species, causing a decrease in the photosynthetic pigments in M. urundeuva. The chlorophyll b content, however, increased in G. ulmifolia and T. hirta leaves upon cement dust treatment. The potential quantum yield of photosystem II in challenged leaves of G. ulmifolia was 3.8% lower than that of control plants, while such trait remained unaffected in the leaves of the other species. No changes in leaf stomatal conductance and antioxidant enzymes activities were observed, except for M. urundeuva, which experienced a 31% increment in the superoxide dismutase activity upon 5mgcm cement dust (leaf plus soil treatment), when compared with control plants. Overall, the mild changes caused by cement dust in the in physiological and biochemical traits of the species studied indicate that such species might be eligible for further studies of revegetation in fields impacted by cement factories.

Impact of dust accumulation on yield and yield components of soybean

“…SOD catalyzes the dismutation of superoxide into oxygen and hydrogen peroxide (Tyagi et al, 2019). Consistent with our results, several studies reported that SOD activity increased in response to dust deposition in plants (Erdal & Demirtas, 2010;Siqueira-Silva et al, 2017;Siqueira-Silva et al, 2016). POD, another antioxidant enzyme, is broadly distributed among plant tissues and plays a significant role in various growth, development, and senescence processes.…”

“…Investigations on dust have mainly focused on the impacts of the different kinds of dust on morpho-physiological changes in plants (Drack & Vázquez, 2018;Hatami et al, 2018;Siqueira-Silva et al, 2017;Siqueira-Silva et al, 2016). Stone crusher dust led to a decrease in grain yield of rice (Oryza sativa.…”

Uso, conhecimento e conservação de Myracrodruon urundeuva: uma revisão sistemática

“…A espécie possui capacidade de se regenerar naturalmente em solos degradados por processos erosivos e de baixa qualidade (Venturoli, Fagg, & Felifili, 2011;Volpato & Martins, 2013;Bertonha et al, 2016), com alta eficiência no uso do nitrogênio (Silva et al, 2018a), potencial de fitoextração de cobre do solo (Asensio et al, 2018;Asensio et al, 2019) Research, Society and Development, v. 9, n. 11, e2329118851, 2020 (CC BY 4.0) | ISSN 2525-3409 | DOI: http://dx.doi.org/10.33448/rsd-v9i11.8851 e tolerante ao arsênio (Gomes, Soares, & Garcia, 2014). Apresenta também tolerância à presença de zinco, embora sua germinação diminua em altas dosagens (Gomes et al, 2013a;Gomes et al, 2013b) e resistência à poeira de cimento, mesmo nos primeiros estágios de desenvolvimento (Siqueira-Silva et al, 2016;Siqueira-Silva et al, 2017). Todas essas características qualificam a espécie para integrar projetos de recuperação de áreas degradadas (Ferreira et al, 2015) inclusive em solos contaminados.…”