Florescimento da tangerineira 'Ponkan' e da limeira ácida 'Tahiti' submetidas ao estresse hídrico

Cruz, Maria do Céu Monteiro da; Siqueira, Dalmo Lopes de; Salomão, Luiz Carlos Chamhum; Cecon, Paulo Roberto

doi:10.1590/s0100-29452006000300006

Cited by 6 publications

(5 citation statements)

References 10 publications

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“…The results obtained for F 0 suggest that the ECw values studied caused damage to the photosynthetic apparatus of the passion fruit plants, compromising the PSII, because plants subjected to stress tend to increase their initial fluorescence. This situation is indicative of damage to the light-harvesting complex (LHCII), which is responsible for transferring excitation energy to the PSII reaction center, or even a separation between the reaction center and the LHCII (Cruz et al, 2009).…”

Section: Resultsmentioning

confidence: 99%

“…The decrease in the quantum yield of photosystem II indicates the occurrence of the photoinhibitory effect caused by salt stress (Cruz et al, 2014) and implies that the photosynthetic efficiency of the leaves under ambient light conditions was compromised (Baker, 2008). Hence, the reduction observed in the quantum yield of photosystem II (P680) may be related to the increase in lipid peroxidation, as a result of the diversion of the electron flow from CO 2 assimilation to O 2 reduction (Cruz et al, 2009).…”

Section: Resultsmentioning

confidence: 99%

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Hydrogen peroxide as attenuator of salt stress effects on the physiology and biomass of yellow passion fruit

Andrade¹,

Lima

et al. 2022

Rev. bras. eng. agríc. ambient.

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The success of yellow passion fruit cultivation in the semi-arid region of Northeast Brazil is conditioned on the ability of this crop to develop under salt stress conditions, so it is necessary to identify techniques capable of attenuating the deleterious effects caused by irrigation with high-salinity waters. In this context, the present study aimed to evaluate the fluorescence, photosynthetic pigments and biomass of yellow passion fruit cultivated under salt stress and foliar application of hydrogen peroxide. The study was conducted in a greenhouse, with the experimental design in randomized blocks with three replicates, in a 4 × 4 factorial scheme, which consisted of four values of irrigation water electrical conductivity - ECw (0.7, 1.4, 2.1 and 2.8 dS m-1) and four concentrations of hydrogen peroxide (0, 20, 40 and 60 µM). Irrigation using water with ECw from 1.4 dS m-1 compromised the photochemical efficiency, photosynthetic pigments, and biomass production of yellow passion fruit. Application of hydrogen peroxide at concentration of 20 µM promoted the highest values for variable and maximum fluorescence and concentration of carotenoids, constituting an alternative for the acclimation of yellow passion fruit to salt stress. Application of hydrogen peroxide at concentrations above 20 µM intensified the salt stress on passion fruit.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Hydrogen peroxide as attenuator of salt stress effects on the physiology and biomass of yellow passion fruit

Andrade¹,

Lima

et al. 2022

Rev. bras. eng. agríc. ambient.

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“…Maiores períodos de estresse hídrico favorecem a baixa síntese de giberelinas devido à paralisação e ou redução do sistema radicular, propiciando maior emissão de flores (CRUZ et al, 2006), fato constatado em goiabeiras no México (NAVA et al, 2004). Médias seguidas por letras iguais, maiúsculas nas linhas e minúsculas nas colunas, não diferem entre si pelo teste de Tukey, a 5% de probabilidade.…”

Section: Resultsunclassified

Fenologia da goiabeira 'Paluma' sob diferentes sistemas de cultivos, épocas e intensidades de poda de frutificação

et al. 2008

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O trabalho teve como objetivo avaliar os efeitos de diferentes épocas e intensidades de poda de frutificação sobre a fenologia da goiabeira 'Paluma', em dois sistemas de cultivo, em Pedro Canário (ES). O delineamento experimental foi o de blocos ao acaso, em esquema de parcelas sub-subdivididas. As parcelas foram os sistemas de cultivo irrigado e sequeiro; as subparcelas foram as épocas de poda (10/11/2005, 9/12/2005, 13/1/2006 e 10/2/2006); e as sub-subparcelas foram as intensidades de poda (curta, média e longa). O ciclo da goiabeira 'Paluma', entre a poda até o início da colheita dos frutos, variou de 182 (poda em novembro e dezembro) a 203 dias (poda em fevereiro). A queda fisiológica dos frutos ocorreu até os 56 dias após o final do florescimento. A irrigação e a poda longa proporcionaram maior brotação e estabelecimento dos ramos. As plantas submetidas à poda longa em fevereiro produziram maior número de frutos por ramo. Independentemente da época de poda, as plantas submetidas à poda curta apresentaram menor número de frutos por ramo e menor índice de pegamento de frutos. A irrigação e as podas realizadas em dezembro e janeiro favoreceram a produção de frutos maiores.

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“…Floral induction, through limiting water availability, may be related to a reduction on the root system growing. This reduction modifies the plant's hormonal balance and may compromise phytohormone biosynthesis (Cruz et al, 2006). Cultivating interspecific hybrids of Passiflora in ceramic pot favored vegetative growth.…”

Section: Discussionmentioning

confidence: 99%

Pre-breeding in Passiflora subrotunda Mast.: Morphological and Reproductive Characterization at Different Light Levels

Souza¹,

Souza²,

Almeida³

et al. 2018

horts

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Passiflora are ornamental plants that are appreciated as part of outdoor decor, composing pergolas and gardens, as well as in interior ornamentation where species tolerant to environments with less light availability are used. The objective of this study was to evaluate the influence of different levels of light and pot types on morphological and reproductive characteristics in Passiflora subrotunda and to support genetic breeding programs of ornamental passifloras. The conditions of 75% and 100% light favored vegetative morphological characteristics through the time (105 days). Floral characteristics also presented higher values along increasing light levels. All qualitative characters related to flower and plant coloration did not vary among genotypes. The species possesses diurnal anthesis and flowers throughout the year. Plants cultivated in concrete pots showed greater growth and flower production. Pollen grains (PGs) are large, with an isopolar form, a small polar area, and a long aperture, and amylaceous. Percentage of viable PG was high: above 97% using Alexander solution and reaching up to 91% with fluorescein diacetate. Stigmas were partially receptive during the flower’s opening period. Percentage of self-compatibility was lower, based on the higher fertilization rate through cross-pollination. These information will be used in planning of ornamental Passiflora-breeding programs, assisting in the selection of characteristics and breeding methods.

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Florescimento da tangerineira 'Ponkan' e da limeira ácida 'Tahiti' submetidas ao estresse hídrico

Cited by 6 publications

References 10 publications

Hydrogen peroxide as attenuator of salt stress effects on the physiology and biomass of yellow passion fruit

Hydrogen peroxide as attenuator of salt stress effects on the physiology and biomass of yellow passion fruit

Fenologia da goiabeira 'Paluma' sob diferentes sistemas de cultivos, épocas e intensidades de poda de frutificação

Pre-breeding in Passiflora subrotunda Mast.: Morphological and Reproductive Characterization at Different Light Levels

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