<b>Nutritional content in <i>Eucalyptus benthamii</i> mini-stump leaves

Abstract

ABSTRACT. The aim of this study was to evaluate the foliar nutrient content in Eucalyptus benthamii mini-stumps treated with different Zn and B concentrations during successive shoot collections. Shoots were collected from mini-stumps fertigated with nutrient solutions containing different concentrations of Zn and B (S1 -free of Zn and B; S2 -0.5 mg L Zn and B). Eight shoot collections from the clonal mini-garden were performed. For each shoot collection, the nutritional content of the leaf was determined (N, P, K, Ca, Mg, S, B, Cu, Fe, Mn and Zn). The experiment was conducted using a randomized design with a split plot and included three replications. The foliar macro and micronutrient contents varied significantly in relation to the treatments, and the S5 and S6 nutritive solutions presented the best responses.Keywords: nutritive solution, fertigation, mini-cutting technique, clonal mini-garden. Teor nutricional foliar em minicepas de Eucalyptus benthamiiRESUMO. Objetivou-se avaliar os teores foliares nutricionais de minicepas de Eucalyptus benthamii em relação a diferentes concentrações de Zn e B ao longo de sucessivas coletas de brotações. As brotações foram oriundas de minicepas fertirrigadas com soluções nutritivas variando nas concentrações de Zn e B (S1 -isento de Zn e B, S2 -0,5 mg L de Zn e B), sendo realizadas oito coletas de brotações do minijardim clonal. Ao longo do experimento foram determinados o teor nutricional foliar de N, P, K, Ca, Mg, S, B, Cu, Fe, Mn e Zn. Considerou-se o delineamento inteiramente casualizado em esquema de parcelas subdivididas, com três repetições. Os teores foliares de macro e micronutrientes variaram significativamente em relação aos tratamentos avaliados, sendo que as soluções S5 e S6 apresentaram as melhores respostas.Palavras-chave: solução nutritiva, fertirrigação, miniestaquia, minijardim clonal.

Evaluation of total protein, peroxidase, and nutrients measured by pXRF for the determination of tissue rejuvenation/reinvigoration of Eucalyptus microcorys

“…According to Hartmann et al (2017), an increase in endogenous levels of indole-3-acetic acid (IAA), an auxin linked to adventitious rooting, may be favoured by the presence of Zn through its effect on increasing the production of tryptophan, a natural precursor of IAA and of reserve substances. Similar results relating zinc to an increase in adventitious rooting of mini cuttings were verified by Cunha et al (2009c) with Eucalyptus grandis W. Hill ex Maiden and E. grandis × E. urophylla and by Brondani et al (2014) with Eucalyptus benthamii Maiden & Cambage. With Fe, only the E. microcorys selected tree did not have adequate Fe levels.…”

“…Although the importance of nutrients in the adventitious rooting process is recognized, for example phosphorous (P), sulphur (S), potassium (K), calcium (Ca), zinc (Zn), they are poorly understood due to the biochemical and physiological complexity during rhizogenesis (Cunha et al 2009a, b;Brondani et al 2014;Hartmann et al 2017). Portable X-ray fluorescence spectroscopy (pXRF) offers an effective way of quantifying or qualifying virtually any element quickly and non-destructively, in the field or in the laboratory (McGladdery et al 2018).…”

Efeitos da nutrição mineral, coleta de brotações e ácido indolbutírico (AIB) no enraizamento e histologia de miniestacas de Eucalyptus urophylla S. T. Blake

“…É comum haver oscilações na produção e no estado fisiológico de miniestacas em relação às coletas, ocorrendo picos de produção seguidos de intenso decréscimo. Isto ocorre em função da necessidade de adaptação inicial das minicepas ao ambiente após a quebra de dominância apical e a poda para indução de brotação (BRONDANI et al, 2014a). Resultados semelhantes foram obtidos por Rosa et.…”

Growth Regulators Affect the Growth and Biochemical Activity of Curcuma longa Plants Grown in vitro

“…The medium with 70% salts and 60 g L -1 sucrose (M5) was toxic to the roots, and significantly reduced the number and dry mass of the roots. Brondani et al (2014) reported that interference by the osmotic potential of the medium compromises the formation of roots, as they are the first organ to come into contact with the medium. The roots can dehydrate or undergo cellular collapse if the osmotic potential of the medium is very high (Silva et al, 2017).…”