Crescimento e fotossíntese de plantas de pinhão-manso cultivadas em diferentes condições de luminosidade

Schock, Anderson Augusto; Ramm, Aline; Martinazzo, Emanuela Garbin; Silva, Diolina M.; Bacarin, Marcos Antônio

doi:10.1590/s1415-43662014000100001

Cited by 20 publications

(14 citation statements)

References 15 publications

(13 reference statements)

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“…Stomatal conductance (gs) was positively correlated with GSR (r = 0.76), PAR (r = 0.76) and TAIR (r = 0.66), indicating that the highest gs (364.23 mmol m -2 s -1 ) was obtained with highest values of PAR (3.68 MJ m -2 d -1 ), GSR (10.68 MJ m -2 d -1 , TAIR (30.7 °C) ( Figure 2A). This occurred because, under these conditions, leaf water potential did not reach minimum values to induce stomatal closure (Schock et al, 2014).…”

Section: Resultsmentioning

confidence: 99%

“…Chlorophyll b content (Chl b) showed a negative correlation with GSR (r = -0.23) and positive correlation with PAR/GSR (r = 0.86), which shows that the Chl b content (4.33 mg L -1 ) was higher when the cultivation module had a higher percentage of PAR (36.6% in the anti-UV LDPE + freshnet) ( Figure 2B). Silva et al (2014) reported that the content of photosynthetic pigments in sugarcane varies when plants are subjected to stress situations.…”

Section: Resultsmentioning

confidence: 99%

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Photo-selective shade nets on the production and quality of sugarcane plantlets

Júnior

Pandorfi

Filho

et al. 2019

Rev. bras. eng. agríc. ambient.

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Brazil is the world’s largest producer of sugarcane (Saccharum officinarum L.) and research aimed at propagation has promoted higher quality in production. The objective of this study was to investigate the effect of the variation of micrometeorological elements on the survival and quality of pre-sprouted sugarcane plantlets. The study was carried out in a protected environment (UFRPE). Plantlets of the cultivar RB92579 were obtained by the technique of production of pre-sprouted plantlets. The protected environments were divided into four modules covered with low-density polyethylene plastic + photo-selective shade nets and one module without shade net. Micrometeorological data of global and photosynthetically active solar radiation, air temperature, substrate temperature, relative humidity and the solar radiation spectrum were recorded in each module. The experiment was conducted in a completely randomized design and the principal component analysis was used to verify the association between the cultivation modules, micrometeorological variables and crop variables. Anti-UV low-density polyethylene plastic + freshnet led to lower transmittance of global solar radiation, higher percentage of photosynthetically active radiation and lower plantlet mortality. Substrate temperature above 30.2 °C resulted in higher plantlet mortality. Larger spectrum in the red range led to the production of better quality plantlet. The use of freshnet shade net promoted adequate conditions for the cultivation of sugarcane plantlets and allows obtaining better quality plantlets.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Photo-selective shade nets on the production and quality of sugarcane plantlets

Júnior

Pandorfi

Filho

et al. 2019

Rev. bras. eng. agríc. ambient.

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“…Yusuf et al (2010) have reported similar results in transgenic plants of Brassica juncea exposed to saline stress, heavy metals, and osmotic stress. Such results give us evidences about mechanisms increasing the activity of PSI, such as cyclic electron flow around PSI or the Mehler reaction (Campos et al, 2014;Schock et al, 2014). The importance of these mechanisms is protection against photo-oxidation through of conduction of electron to alternative via that prevent the formation of oxigen reactive (Miyake, 2010;Oukarroum et al, 2015).…”

Section: Chlorophyll a Fluorescence Transient Ojipmentioning

confidence: 85%

Physiological responses to intense water deficit in two genotypes of crambe (Crambe abyssinica Hochst.)

Martins¹,

Souza²,

Pitol³

et al. 2017

Aust J Crop Sci

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Drought stress is a major environmental factor limiting growth and agricultural productivity. The objective of this study was to compare photosynthetic responses to intense water deficit and the recovery capacity in crambe plants (Crambe abyssinica Hochst. cultivar FMS Brilhante and lineage FMS CR1101) using chlorophyll a fluorescence analyses. Plants were submitted to water deficit for seven days followed by rehydration. Chlorophyll a fluorescence measurements were performed using a Handy-PEA fluorometer. Under drought stress, there was a reduction of the leaf relative water content (RWC) and stomatal conductance (g s ), with full recovery after three days of rehydration to BRS Brilhante cultivar. Both genotypes showed decreased flux of electrons transport from the absorption to the reduction of the intersystem acceptors. FMS Brilhante cultivar showed better energetic connectivity (L-band) between photosystem II (PSII) units and lower inactivation of the oxygen-evolving complex (K-band), evidencing advantages of the cultivar compared to FMS CR1101 lineage. Finally, the recovery of photosynthetic activity observed in FMS CR1101 lineage during rehydration was due the phenomena related to the electron flow around the PSI. Keywords:Chlorophyll a fluorescence; Drought tolerance; JIP-test; Recovery; Photosystem II. Abbreviations: F 0 = F 20 µs , minimum fluorescence, when all PSII RCs are open; F2 (100 µs) and F3 (300 µs) , fluorescence intensity at 100 and 300 µs, respectively; F4 (2 ms) and F5 (30 ms), fluorescence intensity at the J-step (2 ms) and the I-step (30 ms), respectively; F m , maximum fluorescence, when all PSII RCs are closed; g s , stomatal conductance; RWC, relative leaf water content; DH, days after the onset of drought stress; RC, days after rehydration; P 680 , reaction center of photosystem II; PQH 2 , plastoquinol; CF, chlorophyll a fluorescence, OEC, oxygen-evolving complex; PSI, photosystem I; PSII, photosystem II; Q A , primary quinone acceptor of PSII; RC, reaction centre; ROS, reactive oxygen species; V t , variable fluorescence between steps O (20 µs) and P; V OK , variable fluorescence between steps O (20 µs) and K (300 µs); V OJ , variable fluorescence between steps O (20 µs) and J (2 ms); V IP , variable fluorescence between steps I (30 ms) and P; ΔV , diference kinetic; TM,turgid mass; DM, dry mass.

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“…This could be due to the species having adapted through evolution to the high luminosity, a characteristic of the tropical regions where they occur naturally. According to Schock et al (2014), a dependence on light in the physiological processes of plants reflects in their maintenance of homeostasis. As a result, most plants…”

Section: Resultsmentioning

confidence: 99%

Indução de brotações in vitro de Heliconia latispatha em função do fotoperíodo e reguladores de crescimento

Rodrigues

Santos

Carvalho

2016

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Considering the growing economic importance of tropical flowers and the advantages of techniques applied to the in vitro cultivation of these plants, it is necessary to carry out studies to evaluate growth in species such as Heliconia latispatha. The aim of this study therefore, was to evaluate in vitro shoot induction for different concentrations of BAP and NAA and as a function of the photoperiod. Explants from zygotic embryos were inoculated in MS medium containing different concentrations of BAP (0.0, 0.5, 1.0, 1.5, 2.0 or 2.5 mg L -1 ), with the cultures kept in a growth room at a temperature of 24.0 ± 2.0° C, under a photoperiod of 12 and 16 hours of light and a light intensity of 30 μmol m -2 s -1 . At 21, 28, 35, 42 and 49 days after inoculation, the number of shoots per explant was evaluated. The treatment at the BAP concentration that gave the best multiplication rate (2.5 mg L -1 ) was set, and was tested in a further trial with different concentrations of NAA (0.0, 0.2, 0.4, 0 6, 0.8 or 1.0 mg L -1 ) under the same conditions as the previous experiment. The experimental designs were completely randomised, with five replications, and analysed in a 6 x 2 factorial. The data were submitted to analysis of variance and regression. No significant differences were seen in relation to the photoperiod or its interaction with the cytokinin and auxin under test. Multiplication was greater in the presence of 2.5 mg L -1 BAP, which gave a rate of 1.25 shoots/explant at 49 days of in vitro culture. The association of this BAP dosage with 1.0 mg L -1 NAA was even more efficient, producing 1.83 shoots per explant at 30 days of growth. The use of BAP together with NAA is beneficial to the induction of shoots in H. latispatha. Keywords: Heliconiaceae, 6-benzylaminopurine, naphthaleneacetic acid, tissue culture. RESUMO Indução de brotações in vitro de Heliconia latispatha em função do fotoperíodo e reguladores de crescimentoConsiderando a crescente importância econômica das flores tropicais e as vantagens das técnicas aplicadas ao cultivo in vitro para estas plantas, torna-se necessária a realização de estudos que avaliem a propagação de espécies como a Heliconia latispatha. Diante do exposto, o objetivo do trabalho foi avaliar a indução de brotações in vitro em função de diferentes concentrações de BAP e ANA em função de fotoperíodos. Os explantes, oriundos de embriões zigóticos, foram inoculados em meio MS contendo diferentes concentrações de BAP (0,0; 0,5; 1,0; 1,5; 2,0 ou 2,5 mg L -1 ), mantendo-se as culturas em sala de crescimento com temperatura de 24,0 ± 2,0 ºC sob fotoperíodo de 12 e 16 horas de luz e intensidade luminosa de 30 μmol m -2 s -1 . Aos 21, 28, 35, 42 e 49 dias após a inoculação, foi avaliado o número de brotos obtidos por explante. O tratamento com a concentração de BAP que proporcionou melhor taxa de multiplicação (2,5 mg L -1 ) foi fixado e, em outro ensaio foi testado com diferentes concentrações de ANA (0,0; 0,2; 0,4; 0,6; 0,8 ou 1,0 mg L -1 ) nas mesmas condições do experimento ...

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Crescimento e fotossíntese de plantas de pinhão-manso cultivadas em diferentes condições de luminosidade

Cited by 20 publications

References 15 publications

Photo-selective shade nets on the production and quality of sugarcane plantlets

Photo-selective shade nets on the production and quality of sugarcane plantlets

Physiological responses to intense water deficit in two genotypes of crambe (Crambe abyssinica Hochst.)

Indução de brotações in vitro de Heliconia latispatha em função do fotoperíodo e reguladores de crescimento

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