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Short-term changes of fructans in ryegrass (Lolium multiflorum 'Lema') in response to urban air pollutants and meteorological conditions

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Autor(es):
Sandrin, Carla Zuliani ; Leone Figueiredo-Ribeiro, Rita de Cassia ; Carvalho Delitti, Welington Braz ; Domingos, Marisa
Número total de Autores: 4
Tipo de documento: Artigo Científico
Fonte: ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY; v. 96, p. 6-pg., 2013-10-01.
Resumo

We investigated whether the fructan content, a storage carbohydrate, of Lolium multiflorum 'Lema' plants grown in a subtropical urban environment characterized by typical diurnal profiles of air pollutants and meteorological conditions changed over the course of a day during different seasons. Plants were collected every 2 h on the last day of each two-month seasonal field experiment and separated into shoot (stubble or stubble+leaf blades) and roots for carbohydrate analyses and biomass determination. Diurnal contents of total fructose in the stubbles increased with high temperatures. In the roots, fructose accumulation showed a positive relation with hourly variations of both temperature and particulate matter and a negative relation with irradiance and SO2. Seasonal variation in shoot and root biomasses coincided with the seasonal variation of total fructose and were negatively affected by relative humidity and SO2, respectively. We concluded that hourly changes of fructans over the course of a day may increase the ability of L. multiflorum to tolerate short-term oscillations in weather and air pollution commonly observed in the subtropical urban environment, increasing its efficiency in monitoring air quality. (C) 2013 Elsevier Inc. All rights reserved. (AU)

Processo FAPESP: 00/06422-4 - Caesalpinia echinata (Pau-brasil) da semente à madeira, um modelo para estudos de plantas arbóreas tropicais brasileiras
Beneficiário:Rita de Cassia Leone Figueiredo Ribeiro
Modalidade de apoio: Auxílio à Pesquisa - Temático
Processo FAPESP: 05/04139-7 - Carboidratos de plantas tropicais como moduladores de processos ecofisiológicos e indicadores de respostas a estresses ambientais
Beneficiário:Marcia Regina Braga
Modalidade de apoio: Auxílio à Pesquisa - Temático