Effect of humic substances and weather conditions on leaf biochemical changes of fertigated guava tree, during orchard establishment

Abstract

-In São Francisco Valley, Northeast Brazil, humic substances have been used by growers in fertigated fruit crops, due to its improvements on soil conditions and in plant nutrient uptake, metabolism and growth, reported from different growing places and crops. Nevertheless, little information about plant response to humic substance usage for local soil, weather and cropping system conditions is known. Hence, the metabolic response of guava tree during the orchard establishment to fertigation with humic substances and its correlation to the weather conditions were evaluated in Petrolina, State of Pernambuco. The treatments were manure application in soil combined with mineral fertilizers and humic substances applied through irrigation water. The results showed that the fertigation treatments and plant age did not present conclusive effects in guava leaf contents of carbohydrates, proteins and amino acids. On the other side, the leaf contents of these compounds were influenced by the weather conditions. Index terms: Psidium guajava, carbohydrates, proteins, amino acids EFEITO DE SUBSTÂNCIAS HÚMICAS E CONDIÇÕES METEOROLÓGICAS NAS ALTERAÇÕES BIOQUÍMICAS FOLIARES EM GOIABEIRAS FERTIRRIGADA, DURANTE A FORMAÇÃO DO POMARRESUMO -No Vale do São Francisco, em Petrolina -PE, as substâncias húmicas têm sido aplicadas em fertirrigação de espécies frutíferas, baseando-se nas informações sobre melhorias que proporcionam ao solo, aumento de absorção de nutrientes, metabolismo e crescimento de plantas, obtidas em diferentes locais e culturas. Porém, existe pouca informação sobre as respostas das planta à aplicação de substâncias húmicas nas condições locais de solo, clima e sistema de cultivo. Assim, este trabalho avaliou a resposta metabólica de goiabeiras, em fase de formação, à fertirrigação com substâncias húmicas, e sua correlação com as condições climáticas em Petrolina -PE. Os tratamentos foram aplicação de esterco no solo combinada com a fertirrigação com fertilizantes minerais e com substâncias húmicas. Os tratamentos de fertirrigação e a idade das plantas não apresentaram resultados conclusivos quanto aos teores de carboidratos, proteínas e aminoácidos nas folhas de goiabeiras em formação. Por outro lado, os teores foliares dessas moléculas respondem às condições climáticas. Termos para indexação: Psidium guajava, carboidratos, proteínas, aminoácidos.1 (Paper 080-06).

Protein Profiling of Arabidopsis Roots Treated With Humic Substances: Insights Into the Metabolic and Interactome Networks

“…The involvement of HS in stimulation of protein synthesis in plants has been previously observed in many studies: in Arabidopsis roots (Trevisan et al, 2011), maize roots (Carletti et al, 2008), and guava leaves (Dantas et al, 2007). Canellas et al (2002) also observed that the HA and Indole Acetic Acid (IAA) groups may be able to access receptors and resulted in activation of protein synthesis in maize roots.…”

An Appraisal on the Source-to-Sink Relationship in Plants: an Application of Desorption Electrospray Ionization Mass Spectrometry Imaging

“…Mature leaves, which produces carbohydrates at a maximum photosynthetic rate, produce higher amounts of hexoses whereas young leaves have no efficient photosynthetic machinery thus producing a lower amount of this metabolite. 2,5,6,38 Figure 3b shows the spatial distribution of sucrose (Table 1) in the three leaves. These images reveal a roughly homogeneous distribution of this metabolite throughout the three types of leaves.…”

Effect of Addition of Organic Fertilizer and Rootstock in Lemon Transplants Exposed to Water Stress

“…It turned out from the above that is for organic fertilizer A significant impact on its content Physiological characteristics According to the results of the above tables may be due to the role of organic fertilizr Increasing soil Portability to water retain and improve the physical, chemical and biological properties of the soil As well as improving root growth And therefore Increase water absorption (Awad et al, 1993;Maksoud et al, 2012), It also increases photosynthesis and carbohydrates formation and proteins That is basis structure Enzymes and therefore It reduces the amino acids Decaying Including proline, Since organic fertilizer improves the absorption of elements, including potassium It regulates the movement of opening and closing the stomata and thus has the effect of increasing the relative water content of the cells and thus increasing the stomata area (Kava et al, 2005). the activity of the peroxidase enzyme has also increased in Leaves when adding organic fertilizers may be due to the increase in physiological, chemical and biological processes in plant cells and protein formation that leads to increased enzyme concentrations It is in cells (Dantas et al, 2007). As for the role of the rootstock, the contrast returns between the rootstock of citrus for the characteristics of the above tables is due to the reasons for genetic traits return to effect rootstock on the scion due to the effect of the rootstock on the scion, Dubey and Sharma (2016) reported that there was a significant effect for the rootstock type used in grafting on citrus lemon on all growth characteristic.…”