Data/hora: 25/06/2024 17:43:34

Biblioteca(s): | Embrapa Milho e Sorgo.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | C - 0
Data corrente: | 29/01/2016
Data da última atualização: | 24/02/2016
Autoria: | LAVINSKY, A. O.; MAGALHAES, P. C.; ÁVILA, R.; GOMES JR. C. C.; CARNEIRO, N. P.
Afiliação: | PAULO CESAR MAGALHAES, CNPMS; NEWTON PORTILHO CARNEIRO, CNPMS.
Título: | Analysis of maize photosyntheis parameters and whole plant oxidative damage under long-term drought.
Ano de publicação: | 2015
Fonte/Imprenta: | Advances in Crop Science and Technology, p. 1-6, 2015.
DOI: | http://dx.doi.org/10.4172/2329-8863.S1-007
Idioma: | Inglês
Conteúdo: | We test if maize maintain yield under long-term drought throught improvement of photosyntheis (A) coupled with up-regulation of the antioxidant system induced by increase in levels of abscisic acid (ABA). Four maize genotypes with constrasting drought tolerance: BRS1010 and 2B710 (sensitive) and DKB 390 and BRS1055 (tolerant) in two soil water levels, field capacity (FC) and water deficit (WD) were used. WD was applied at the pre-flowering stage for 12 days, and oxidative damage was measured as malondialdehyde (MDA) accumulation in whole plant. Plants from tolerant genotypes DKB390 and BRS1055 showed higher A and had no signal of oxidative damage compared to sensitive genotypes 2B710 and BRS1010 under WD, resulting in a higher yield attributes. For our surprising, it was dissociated from up-regulation of the antioxidant system ABA-mediated. In turn, plants from two sensitive genotypes under WD showed compared to FC consistent reduction of A due to mesophyll conductance (gm) limitation. Only WD plants from sensitive genotype BRS1010 presented leaf ABA levels increased related to its counterparts under FC; however, due to the inactivation of catalase activity the oxidative damage control was not effective, resulting a hardly MDA acumulation in both leaves and roots. The maize tolerance under long-term drought is linked to scape of gm decline.
Palavras-Chave: | Fotorrespiração; Mesofilo condutância; Sistema antioxidante.
Thesagro: | Ácido abscísico; Fotossíntese; Milho.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/138044/1/Analysis-maize.pdf
Registro original: | Embrapa Milho e Sorgo (CNPMS)
Exemplares: | CNPMS - (26859-1) - UPC - AP - DD -  -  -  - DIS