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Soluble fractions and kinetics parameters of nitrate and ammonium uptake in sunflower (“Neon” Hybrid) Rev. Ciênc. Agron.
Alves,Luiziene Soares; Torres Junior,Carlos Vergara; Fernandes,Manlio Silvestre; Santos,André Marques dos; Souza,Sonia Regina de.
ABSTRACT Sunflower plants are source of oilseeds with great importance for agroenergy. Nitrogen deficiency is considered one of the factors limiting growth and yield. The objective of this study was to assess the nitrogen uptake (high and low supply of nitrate and ammonium) and to determine the uptake kinetics parameters (Km and Vmax) of these ions in sunflower plants (Neon hybrid). The experiment was carried out in a growth chamber using a hydroponic system. The following treatments were applied: 0.2 and 2.0 mmol L-1 of N-NO3- and N-NH4+. The two kinetics parameters (Km and Vmax) involved in the uptake of nitrate and ammonium were determined, as well as the soluble fractions (N-NO3-, N-NH4+, amino-N and sugars) and total N, in different plant tissues. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Helianthus annuus L.; Oilseed plants; Total N; Nitrogen.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000100013
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Contribution of dark septate fungi to the nutrient uptake and growth of rice plants BJM
Vergara,Carlos; Araujo,Karla Emanuelle Campos; Alves,Luiziene Soares; Souza,Sônia Regina de; Santos,Leandro Azevedo; Santa-Catarina,Claudete; Silva,Krisle da; Pereira,Gilmara Maria Duarte; Xavier,Gustavo Ribeiro; Zilli,Jerri Édson.
ABSTRACT The use of dark septate fungi (DSE) to promote plant growth can be beneficial to agriculture, and these organisms are important allies in the search for sustainable agriculture practices. This study investigates the contribution of dark septate fungi to the absorption of nutrients by rice plants and their ensuing growth. Four dark septate fungi isolates that were identified by Internal transcribed spacer phylogeny were inoculated in rice seeds (Cv. Piauí). The resulting root colonization was estimated and the kinetic parameters Vmax and Km were calculated from the nitrate contents of the nutrient solution. The macronutrient levels in the shoots, and the NO3--N, NH4+-N, free amino-N and soluble sugars in the roots, sheathes and leaves were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Oryza sativa L.; DSE; NO3−-N; Tillering; Colonization.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000100067
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