Crescimento de plantas de tectona grandis sob restrição hídrica

Matos, Fábio Santos; Freitas, Igor Alberto Silvestre; Souza, Brenda Rodrigues de; Araújo, Márcio da Silva; Rosa, Vanessa do Rosário

doi:10.30612/agrarian.v11i39.5284

Cited by 6 publications

(5 citation statements)

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“…The plant height, stem diameter, number of leaves, transpiration rate, and total plant weight of plants irrigated with 100% of the retention capacity of the substrate were higher than those of plants under water deficit 13%, 9%, 50%, 50%, and 32%, respectively. The water deficit resulted in lower availability of water for cell expansion and significant restriction to vegetative growth and corroborate those found by Matos, Freitas, Souza and Lopes, (2018) who identified that the initiation and development of the leaf primordium are dependent on the water status of the plant. The emergence and development of leaf primordia are dependent on the plant's water status.…”

Section: Resultssupporting

confidence: 87%

Growth of Eucalyptus urocam Under Different Irrigation Managements

Oliveira¹,

Marques²,

Santos³

et al. 2019

JAS

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The objective of the present study was to evaluate the effects of different water irrigation managements on the growth of Eucalyptus urocam plants. The experiment was conducted in a greenhouse at the Goiás State University, Ipameri campus, Brazil, using 100-day-old Eucalyptus urocam seedlings, which were transplanted into pots with 5 kg of substrate. A completely randomized experimental design with five replications was used, in a 2 × 4 factorial arrangement consisting of two daily irrigation depths (50%, and 100% of the substrate retention capacity) and four irrigation times (7:30 a.m., 11:30 a.m., 4:30 p.m., and 7:00 p.m.). The treatments were applied when the plants were 120 days old, and last 18 days, then, the variables were analyzed. E. urocam plants subjected to water deficit had high stomatal sensitivity, reduced transpiration rate, and maintained hydration, which are characteristics of isohydric plants. E. urocam plants irrigated at 4:30 p.m. or 7:00 p.m. presented low stomatal sensitivity and high biomass accumulation potential. Therefore, irrigations between 4:30 p.m. and 7:00 p.m. are recommended for Eucalyptus urocam plants at the initial growth stage.

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Section: Resultssupporting

confidence: 87%

Growth of Eucalyptus urocam Under Different Irrigation Managements

Oliveira¹,

Marques²,

Santos³

et al. 2019

JAS

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“…The reduction in number of leaves and growth under water deficit are adjustment strategies to tolerate low water availability, because drought promotes morphophysiological changes with intent to stimulate acclimation and tolerance to the new conditions (Matos, Freitas, Souza, Araújo, & Rosa, 2018) The consonance between biomass and transpiration reflects the variation in water availability in the stomatal conductance and CO 2 diffusion for photosynthesis, because as the water volume provided was increased, the stomata opened, resulting in higher CO 2 influx and water efflux with consequent increase in photosynthesis, and increases in the biomass and transpiration with maximum point at 111% and 118% water regimes, respectively. According to Souza et al (2015), transpiration decreases under low water viability indicating tolerance to water deficit; but other mechanisms are needed to ratify tolerance.…”

Section: Discussionmentioning

confidence: 99%

Passiflora edulis Growth Under Different Water Regimes

Faria¹,

Souza²,

Alvarenga³

et al. 2020

JAS

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The present study aimed to evaluate the initial growth of Passiflora edulis plants under water deficit and inundation. The work was carried out in a greenhouse covered with transparent plastic in pots with a capacity of five liters and filled with 5 kg of substrate composed of oxisol, sand and cattle manure in the proportion of 3:1:1, respectively. The experimental design used was completely randomized, with seven treatments and five repetitions; 30 days after emergence, the plants were irrigated with water equivalent to 25%, 50%, 75%, 100%, 125%, 150% and 175% of the pot capacity and the analyzes were performed on the 52nd day. The P. edulis plants under limitation and excess water showed high stomatal sensitivity to reduce the water. In addition, under water deficit, the plants showed bigger root growth to maximize water absorption from the soil, but in both stresses the plants demonstrated reduced vegetative growth, that implies retarded establishment, thus, demonstrating an average susceptibility to water deficit and inundation.

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“…The water restriction does not cause significant losses in the survival of seedlings in T. grandis, because it presents a stomata high sensitivity, closing them and thus reducing its leaf area (MATOS et al, 2018). However, in this study there is a decrease in survival values in GH, SH and FS (Table 1), a fact also observed by Badilla et al (2016) for T. grandis in the passage of GH and SH seedlings, 95.37% and 89.93% respectively, and Meza et al (2015) 87.5% in GH and 69.39% in SH.…”

Section: Discussionmentioning

confidence: 99%

QUALITY OF CLONAL SEEDLINGS OF Tectona grandis Linn F. ROOTED IN DIFFERENT CONCENTRATIONS OF INDOLEBUTYRIC ACID

Carvalho¹,

Filho

Kratz

2019

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The general objective of this paper is to evaluate the effect of different IBA concentrations on greenhouse, shade and full sun survival, root vigor and seedling quality in Tectona grandis. To do so, mini-cuttings were prepared containing two pairs of leaves reduced to 25% of their original size (7.0 ± 1.0 cm) in length and bevel cut at the base. They were submitted to five treatments with different concentrations of indolebutyric acid (0, 500, 1000, 1500 e 2000 mg L-1), remaining in greenhouse, house of shade and in full sun for 30, 20 and 15 days, respectively. Survival was evaluated in greenhouse, house of shade and full sun; radicial vigor, height, diameter of the neck, ratio between shoot height and diameter, root dry mass, aerial, and total mass. The experimental design was in randomized blocks, with five replications of 15 plants and five treatments. Data were submitted to the normality test, Bartlett test and polynomial regression of the second degree. As a result, it was verified that the use of IBA did not influence root vigor and survival, however, it provided seedlings with a higher dry mass, being the best the 2000 mg L-1 treatment.

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Crescimento de plantas de tectona grandis sob restrição hídrica

Cited by 6 publications

References 0 publications

Growth of Eucalyptus urocam Under Different Irrigation Managements

Growth of Eucalyptus urocam Under Different Irrigation Managements

Passiflora edulis Growth Under Different Water Regimes

QUALITY OF CLONAL SEEDLINGS OF Tectona grandis Linn F. ROOTED IN DIFFERENT CONCENTRATIONS OF INDOLEBUTYRIC ACID

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