Data/hora: 02/06/2024 15:56:44

Provedor de dados: | Brazilian Journal of Plant Physiology
País: | Brazil
Título: | IV.Heat stress in Triticum: kinetics of Fe and Mn accumulation
Autores: | Dias,Ana S.; Lidon,Fernando C.; Ramalho,José C.
Data: | 2009-01-01
Ano: | 2009
Palavras-chave: | Heat stress; Nutrients; Translocation; Triticum aestivum L.; Triticum turgidum subsp. durum; Uptake.
Resumo: | The interactions between Fe/Mn accumulation and the photosynthetic light reactions were investigated in heat stressed bread and durum wheat genotypes (Triticum aestivum L. and Triticum turgidum subsp.durum). Four genotypes were chosen according to its genetic background diversity. Plants were grown in a greenhouse at two different day/night temperatures regimes (control - 25/14ºC and heat stress - 31/20ºC), during the grain filling phase. The contents and uptake/translocation of Fe and Mn were evaluated on booting, grain filling and maturity and correlated with chlorophyll a fluorescence parameters. It was found that, under heat stress, the concentrations of Fe in the culm and leaves diminished in bread wheat, but increased in durum wheat. An opposite trend was found on the contents of Fe in the spike, being this effect higher in Sever. During grain filling, the concentrations of Mn in the heat stressed plants raised significantly in the shoot for all genotypes (excepting Golia). After anthesis, the proportion of Mn translocated also augmented with high temperatures. At maturity, the same trend was found in the translocated proportion of Fe. During grain filling, all the studied fluorescence parameters did not vary significantly except qP and qE that decreased in the heat stressed Golia and F V and Fv/Fm that increases in Acalou. It was concluded that under heat stress, during the grain filling period, Fe and Mn translocation to the shoots accelerates, eventually to overcome the negative effects on several photosynthetic physiological traits.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000200008
Editor: | Brazilian Journal of Plant Physiology
Relação: | 10.1590/S1677-04202009000200008
Formato: | text/html
Fonte: | Brazilian Journal of Plant Physiology  v.21 n.2 2009
Fonte: | info:eu-repo/semantics/openAccess