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Morphological and kinetic parameters of the absorption of nitrogen forms for selection of Eucalyptus clones

Journal of Forestry Research 2021年第4期32卷 1599-1611页

作者： Matheus Severo de Souza Kulmann Betania Vahl de Paula Paula Beatriz Sete Wagner Squizani Arruda Gabriel Alberto Sans Camila Peligrinotti Tarouco luciane almari tabaldi Fernando Teixeira Nicoloso Gustavo Brunetto Soil Science Department Federal University of Santa MariaSanta MariaRS 97105-900Brazil Federal University of Santa Catarina Admar Gonzaga Highway1346FlorianópolisSC 88034-001Brazil Biology Department Natural and Exact Sciences CenterFederal University of Santa MariaSanta MariaRS 97105-900Brazil

Eucalyptus clones are selected according to productivity,wood quality,rooting capacity,and resistance to drought,frost and ***,kinetic and morphological parameters that determine the absorption efficiency of nutrients such as nitrate(NO_(3)^(-)) and ammonium(NH_(4)^(+))are often not considered in breeding *** objective of this study was to evaluate the morphological,physiological and kinetic parameters of nitrogen uptake by clones of Eucalyptus saligna(32,864) and Eucalyptus grandis(GPC23).Morphological parameters in shoot and root systems,biomass and N concentrations in different organs,photosynthetic pigment concentrations,parameters of chlorophyll a fluorescence and photosynthetic rates were *** parameters,maximum absorption velocity(V_(max)),Michaelis-Menten constant(K_(m)),minimum concentration(C_(min)) and influx(I) were calculated for NO_(3)^(-)and NH_(4)^(+) in the two *** clone was more efficient in the uptake of NO_(3)^(-)and NH_(4)^(+),and showed lower K_(m) and C_(min)values,allowing for the absorption of nitrogen at low concentrations due to the high affinity of the absorption sites of clone roots to NO_(3)^(-)and NH_(4)^(+).Higher root lengths,area and volume helped the *** clone in absorption efficiency and consequently,resulted in higher root and shoot *** *** clone had higher K_(m) and Cmin for NO_(3)^(-)and NH_(4)^(+),indicating adaptation to environments with higher N *** results of NO_(3)^(-)and NH_(4)^(+) kinetic parameters indicate that they can be used in Eucalyptus clone selection and breeding programs as they can predict the ability of clones to absorb NO_(3)^(-)and NH_(4)^(+) at different concentrations.

关键词： Ammonium and nitrate Eucalyptus saligna Eucalyptus grandis Root system architecture Nitrogen influx Maximum absorption velocity(V_(max)) Michaelis–Menten constant(K_(m)) Minimum concentration(C_(min))

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