Your browser doesn't support javascript.
loading
Enhancing potassium content in leaves and stems improves drought tolerance of eucalyptus clones.
Santos, Elcio Ferreira; Mateus, Nikolas Souza; Rosário, Mayk Oliveira; Garcez, Tiago Barreto; Mazzafera, Paulo; Lavres, José.
Afiliação
  • Santos EF; Federal Institute of Mato Grosso do Sul, Laboratory of Plant Nutriton, Nova Andradina, Brazil.
  • Mateus NS; University of São Paulo, Center for Nuclear Energy in Agriculture, Piracicaba, Brazil.
  • Rosário MO; Federal University of Sergipe, Campus do Sertão, Nossa Senhora da Glória, Brazil.
  • Garcez TB; Federal University of Sergipe, Campus do Sertão, Nossa Senhora da Glória, Brazil.
  • Mazzafera P; University of São Paulo, Luiz de Queiroz College of Agriculture, Piracicaba, Brazil.
  • Lavres J; University of Campinas, Institute of Biology, Campinas, Brazil.
Physiol Plant ; 172(2): 552-563, 2021 Jun.
Article em En | MEDLINE | ID: mdl-33022105
Eucalyptus are widely planted in regions with low rainfall, occasioning frequent drought stresses. To alleviate the stress-induced effects on plants growing in these environments, soil fertilization with potassium (K) may affect drought-adaptive plant mechanisms, notably on tropical soils with low K availability. This work aimed to evaluate the K dynamic nutrition in eucalyptus in response to soil-K and -water availabilities, correlating the K-nutritional status with the physiological responses of contrasting eucalyptus clones to drought tolerance. A complete randomized design was used to investigate the effects of three water regimes (well-watered, moderate water deficit, and severe water deficit) and two K soil supplies (sufficient and low K) on growth and physiological responses of two elite eucalyptus clones: "VM01" (Eucalyptus urophylla × camaldulensis) and "AEC 0144" (E. urophylla). Results depicted that the K-well-nourished E. urophylla × camaldulensis clone under severe water deficit maintained shoot biomass accumulation by upregulating the K-content in leaves and stems, gas exchange, water-use efficiency (WUEI ), leaf water potential (Ψw), and chlorophyll a fluorescence parameters, compared to E. urophylla clone. Meanwhile, E. urophylla with a severe water deficit showed a decreased of K content in leaves and stem, as well as a reduction in the accumulation of dry mass. Therefore, the K-use efficiency and the apparent electron transport rate through photosystem II were positively correlated in plants grown in low K, indicating the importance of K in maintaining leaf photochemical processes. In conclusion, management strategy should seek to enhance K-nutrition to optimize water-use efficiencies and photosynthesis.
Assuntos
Palavras-chave

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Eucalyptus Tipo de estudo: Clinical_trials Idioma: En Revista: Physiol Plant Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Brasil País de publicação: Dinamarca

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Eucalyptus Tipo de estudo: Clinical_trials Idioma: En Revista: Physiol Plant Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Brasil País de publicação: Dinamarca