The influence of ABA on water relation, photosynthesis parameters, and chlorophyll fluorescence under drought conditions in two maize hybrids with contrasting drought resistance

• Autorzy: de Souza T.C. , Magalhaes P. C. , de Castro E. M. , de Albuquerque P. E. P. , Marabesi M. A.
• Języki publikacji: EN

Abstrakty

EN

Drought is a major limitation of maize cultivation in Brazil. Agronomic and physiological practices have been considered to overcome this stress and consequently, increase grain production. The present study investigated the role of abscisic acid (ABA) application in some physiological parameters, in two hybrids with contrasting drought resistance (DKB 390 and BRS 1030 resistant and sensitive, respectively). Contrasting resistance to drought in these genotypes was determined in previous studies. Water deficit was imposed for 10 days at flowering stage, in association with the application of 100 lM abscisic acid on plant canopy. Evaluations of gas exchange, chlorophyll fluorescence, relative water content (RWC), and endogenous ABA content were performed during stress period and also at water recovery (recovery irrigation). A significant functional relationship was observed between RWC and the parameters of gas exchange and fluorescence. During water recovery, no differences were observed among the treatments. DKB 390 presented higher photosynthesis rate (Pn) and electron transport rate (ETR) under water stress, while BRS 1030 presented higher intercellular CO2 concentration (Ci) and lower photochemical quenching (qP), non-photochemical quenching (NPQ), and lower Fv/Fm ratio. DBK 390 was more responsive to ABA application than BRS 1030, presenting higher endogenous ABA content in the first day of stress. DBK 390 with ABA application reduced the effect of water stress through maintenance of water status, an increase of photosynthetic parameters, and a decrease of decline in the functions of photosystem II during stress.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2013
• Tom: 35
• Numer: 02
• Opis fizyczny: p.515-527,fig.,ref.

Twórcy

autor

de Souza T.C.

• Departamento de Biologia, Setor de Fisiologia Vegetal, Universidade Federal de Lavras, Campus Universita´rio, Caixa Postal 37, Lavras, MG CEP 37200-000, Brazil

autor

Magalhaes P. C.

• Centro Nacional de Pesquisa de Milho e Sorgo, Caixa Postal 151, Sete Lagoas, MG CEP 35701-970, Brazil

autor

de Castro E. M.

• Departamento de Biologia, Setor de Fisiologia Vegetal, Universidade Federal de Lavras, Campus Universita´rio, Caixa Postal 37, Lavras, MG CEP 37200-000, Brazil

autor

de Albuquerque P. E. P.

• Centro Nacional de Pesquisa de Milho e Sorgo, Caixa Postal 151, Sete Lagoas, MG CEP 35701-970, Brazil

autor

Marabesi M. A.

• Departamento de Botaˆnica, Instituto de Biocieˆncias, Universidade de Sa˜o Paulo, Caixa Postal 11461, Sa˜o Paulo, SP CEP 05422-970, Brazil

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