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RISS 인기검색어
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- 저자 : Magalhães Hélida Mara (검색결과 3 건)
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Bonacina Cristine,Nascimento Andressa Bezerra,Barbosa Letícia Neris,de Souza Silvia Graciele Hülse,Magalhães Hélida Mara 한국작물학회 2023 Journal of crop science and biotechnology Vol.26 No.2
During cultivation, environmental factors can cause changes in the metabolism of Curcuma longa L. that limit its development. This study evaluated the efects of diferent sodium chloride (NaCl) concentrations on the leaf anatomy, stomatal features, and biochemical activity of C. longa L. plants. The experiment was conducted in a greenhouse, using rhizomes of C. longa L. planted in plastic pots containing soil, sand, and organic matter (2:1:1). After 180 days of planting, salt stress using NaCl (50, 100, and 150 mM) was induced and a control treatment was made with water. At 150 days post treatment, the morphoanatomical variables of the leaves were evaluated, and biochemical analyses of the leaves and rhizomes were performed. The leaves exposed to intermediate salt concentrations (50 and 100 mM) had fewer hypodermic cells and larger spaces between the cells in the spongy parenchyma. In the 150 mM NaCl group, there was an increase in the total leaf thickness caused by an increase in hypodermic cells. The percentage of closed stomata increased in the 50 mM (85%) and 100 mM (80%) NaCl treatments, and the polar diameter of the cells (1.22%) was reduced in the presence of 150 mM NaCl. Biochemical analyses revealed diferent responses for rhizomes and leaves. The total sugars in the rhizomes increased in the presence of ≥50 mM NaCl, probably because of the need to generate more energy for use in secondary metabolite synthesis pathways. The antioxidative activity and phenolic compounds also increased at the highest NaCl concentrations. In conclusion, we have classifed C. longa L. as a plant that is tolerant to saline stress, owing to the metabolic balance and water-loss barrier provided by the rhizome to mitigate stress damage. Our results showed that C. longa L. plants were tolerant to the high salt concentrations tested in this study (100 and 150 mM).
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Górski Felipe,Gerotti Geysiane Moreira,Gonçalves José Eduardo,Gazim Zilda Cristiani,Magalhães Hélida Mara 한국작물학회 2023 Journal of crop science and biotechnology Vol.26 No.5
In vitro, shoot apices cultures provide an alternative means for producing secondary metabolites of medicinal and pharmaceutical importance. In this study, the major objective was to investigate the efect of Copper (Cu) and Methyl Jasmonate elicitors on basil 'Grecco a Palla' shoot apex growth, on the volatile chemical composition, and biological and enzymatic activities. Stem apex, from seedlings grown in vitro, were used as explant for plant propagation. Murashige—Skoog medium, supplemented with fve elicitors concentrations (T1: 0 µM, 0 µM; T2: 25 µM, 0 µM; T3: 0 µM, 5 µM, T4: 25 µM, 5 µM; T5: 75 µM, 5 µM de Cu and MeJa, respectively) was used for the inoculation. Cooper in combination with MeJa (T3 and T4) reduced the occurrence of oxidation (20%) and hyperhydricity (77%) in the shoot when compared to the control treatment. 25 µM Cu and 5 µM MeJa increased the antioxidant activity by 72.5% (DPPH), the enzymatic activity of Phenylalanine ammonia-lyase (PAL) by 95%, the total phenolic compounds by 33,33%, and superoxide dismutase (SOD) enzymatic activity by 37%. In the 75 µM Cu and 5 µM MeJa treatment resulted in an increase of 20% in the ascorbate peroxidase enzyme activity. Those treatments promoted a higher number of volatile compounds to T4 (20) and T5 (28), of which α-bergamotene, methyl eugenol, and linalool were found to be the majority. β-Pinene, Myrcene, γ-Cadinene, and δ-Cadinene were only identifed in T5. Therefore, the above-mentioned elicitors might be used in combination with the described concentrations, in order to improve the compound synthesis and antioxidant activity.
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Meire Pereira de Souza Ferrari,Rayane Monique Sete da Cruz,Mayara dos Santos Queiroz,Matheus Marquezine de Andrade,Odair Alberton,Hélida Mara Magalhães 한국작물학회 2020 Journal of crop science and biotechnology Vol.23 No.5
Acclimatization is the most delicate stage of micropropagation, which makes it challenging to obtain new seedlings. The use of suitable substrates associated with arbuscular mycorrhizal fungi (AMFs) has been promising during this stage. The goal of this study was to investigate the infl uence of diff erent AMFs and substrates on the acclimatization of Curcuma longa L. The C. longa seedlings were obtained from in vitro cultivation with a specifi c medium for 120 days. After this period, they were transplanted into plastic pots containing two substrate formulations. The fi rst compound was soil and vermiculite (1:1 v/v), and the second was a commercial substrate for vegetables, containing vermicompost and vermiculite (1:1:1 v/v). The fungi used in the study were Rhizophagus clarus, Claroideoglomus etunicatum, and a mixture of the two fungi. A treatment with no fungi was used as the control. After 240 days, the growth and structural characteristics of the plant were measured, as well as nutrients and soil–quality parameters. The use of a substrate rich in organic matter (substrate 2) associated with R. clarus and C. etunicatum promoted 100% survival of C. longa plants. In this condition, the plants were more vigorous. The root system increased in size and biomass, being robust with the presence of many roots. The soil indicators revealed that the fungi helped with the lower activity of the metabolic quotient and increased basal respiration, indicators that demonstrated the benefi cial action of the fungi for the plants. In addition, changes in stomatal conformation and density probably allowed greater CO 2 diff usion.
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