Resistência estomática, tensão de água no xilema e teor de clorofila em genótipos de gravioleira

Nogueira, Rejane Jurema Mansur Custódio; Silva, Josué Francisco da

doi:10.1590/s0103-90162001000300009

Cited by 7 publications

(4 citation statements)

References 4 publications

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“…Independently of the nitrogen doses used, humic substance average values for chlorophyll a, b and total were above those registered by Nogueira and Silva Júnior (2001) in a study on Urea (45% of N), monthly applied (four fertilizations) and defined according to Fernandes (1993), was used as nitrogen source, while the humic substances used in the experiment were extracted from leonardite humic acid powder (Humitec ® ), whose complete composition is as follows: humic extract (16.5%), organic carbon (11.2%), humic acids (13.2%), and fulvic acids (3.3%). The humic substances applied followed the recommendations of the producer, i.e., 30 mL diluted in 3 L of water every 60 days after pruning, reaching two applications for each experiment.…”

Section: Methodsmentioning

confidence: 66%

Physiological indexes of custard apple as a function of nitrogen fertilization and humic substances

Cavalcante¹,

Cunha²,

Rocha³

et al. 2014

RCA

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Custard apple (Annona squamosa L.) is native to tropical America and it occurs spontaneously in the Brazilian northeast region, where it is exploited mainly at subsistence level owing to lack of adequate management and selected genetic material. In this study, we aimed to evaluate the physiological characteristics of custard apple as a function of nitrogen fertilization and application of humic substances in the municipality of Bom Jesus, Piaui state, Brazil. We adopted a randomized block experimental design with treatments arranged in a 4 × 2 factorial scheme, referring to four doses of nitrogen and the presence and absence of humic substances (Humitec ®). The following variables were evaluated: leaf area index (LAI), chlorophyll (A, B, and Total), and photosynthetic active radiation (PAR). The maximum agronomic efficiency for intercepted photosynthetically active radiation was registered under fertilization with 174.70 g/plant of N. RESUMO: A pinheira (Annona squamosa L.) é originária da América tropical, ocorrendo espontaneamente no Nordeste brasileiro, onde é explorada principalmente em nível de subsistência, pela falta de manejo adequado e material genético selecionado. O objetivo do presente trabalho foi avaliar características fisiológicas da pinheira em função de adubação nitrogenada e substâncias húmicas, em Bom Jesus-PI. Adotou-se o delineamento em blocos casualizados com tratamentos distribuídos em esquema fatorial 4 × 2, referentes às quatro doses de nitrogênio e a presença e ausência de substancias húmicas (Humitec ®). Foram avaliadas as seguintes variáveis: índice de área foliar (IAF), clorofila (A, B e Total) e radiação fotossinteticamente ativa (RFA). A máxima eficiência agronômica para radiação fotossinteticamente ativa interceptada é obtida com a dose de 174,70 g/planta de N. Physiological indexes of custard apple as a function of nitrogen fertilization and humic substances Índices fisiológicos da pinheira em função de adubação nitrogenada e substâncias húmicas

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Section: Methodsmentioning

confidence: 66%

Physiological indexes of custard apple as a function of nitrogen fertilization and humic substances

Cavalcante¹,

Cunha²,

Rocha³

et al. 2014

RCA

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“…The intensity and quality of light are factors that can also affect the gas exchange of plants (Costa & Marenco, 2007) and the study of these ecophysiological variables allows a better understanding of the vegetative behavior of plants under varying conditions of the environment in which they are found (Nogueira & Silva, 2001). During the seedling phase, it is essential to consider the light levels to which the plants are exposed, as high levels of irradiance can cause damage to them, altering the levels of chloroplast pigments, reducing the activity of antioxidant enzymes, and also, photoinhibition in the centers photosynthesis reaction (Gonçalves et al 2001;Gonçalves et al, 2005;Liu et al, 2006;Morais et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Shading and its reflections on growth and gas exchanges of Microdesmia rigida (Benth.) Sothers & Prance

Silva

Freire

Bakke

et al. 2020

RSD

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The objective of this research was to evaluate the effect of shading on growth and gas exchange of seedlings of Microdesmia rigida, keeping them under the levels of 0% (full sun), 50% and 70% shading, arranged in a completely randomized design (DIC), with four replications. Plant height, stem diameter, height/diameter ratio, absolute growth rate, leaf area, plant dry matter weight, dry root/shoot weight ratio, Dickson Quality Index (DQI), transpiration, stomatal conductance, photosynthesis rate, internal CO2 concentration, chlorophyll contents a, b and total were analysed. There was a reduction in the rate of transpiration and increase in stomatal conductance, photosynthesis rate and internal CO2 concentration with increased shading. Shading decreased the concentration of chlorophyll a while promoting an increase in chlorophyll b and total chlorophyll, with no significant difference between the levels of 50% and 70% of shading. The shaded environments provided greater growth in height, diameter, leaf area, in addition to providing greater accumulation of dry mass and IQD. It is recommended to produce seedlings of M. rigida seedlings, during the nursery phase, under 50% shading, as this condition provides the achievement of better seedling quality indexes.

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“…It is well already known that plant responses to biotic and abiotic stress stimuli are controlled by defense related hormones [16]; among them, jasmonic acid (JA) is responsible for the elicitation of defenses against attack from herbivores [17]. Furthermore, ecophysiological variables have a great influence not only on the vegetative behavior of cultivated plants but also on their performance regarding productive characteristics [18], being an efficient tool for studying the behavior of plants in response to stress [19]. Assessment of leaf physiological characteristics (chlorophyll content) complement with other analysis [20] was shown to be relevant for the identification of genotypes with differential tolerances to short-term stress [21].…”

Section: Introductionmentioning

confidence: 99%

Physiological traits involved in grazing tolerance of alfalfa genotypes

de Ávila

2020

ARTOAJ

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Alfalfa [1] is one of the most largely distributed forage legume species in the world and it is used on more hectares than any other forage legume. Even so, alfalfa production in Brazil is still limited by the low persistence of this species, especially when used for grazing. Therefore, the objective of this study was to evaluate and select grazing-tolerant germplasm by evaluating genotypes based on their physiological traits. Eight alfalfa genotypes were grown in two different and simultaneous experiments. The experiment ‘A’ evaluated physiological traits: a) chlorophyll content b) sum of lateral roots and shoot and c) length of the first internode The experiment ‘B’ consisted of a jasmonate treatment, which induced remarkable effects on alfalfa roots performance. The CRAltR genotype showed the most promising results for length of the first internode 0.429 cm at the last day of evaluation (day 15). Furthermore, this genotype obtained higher rates in the evaluation of chlorophyll. E1C4AltR in addition to being selected in previous studies for grazing tolerance showed variability for decumbent habit and intermediate values for chlorophyll. The genotypes E1C4 AltR and CRAltR presented more promising results and they will be used for further field evaluations in Brazil.

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Resistência estomática, tensão de água no xilema e teor de clorofila em genótipos de gravioleira

Cited by 7 publications

References 4 publications

Physiological indexes of custard apple as a function of nitrogen fertilization and humic substances

Physiological indexes of custard apple as a function of nitrogen fertilization and humic substances

Shading and its reflections on growth and gas exchanges of Microdesmia rigida (Benth.) Sothers & Prance

Physiological traits involved in grazing tolerance of alfalfa genotypes

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