Photosynthetic light response of the C4 grasses Brachiaria brizantha and B. humidicola under shade

Dias‐Filho, M. B.

doi:10.1590/s0103-90162002000100009

Cited by 85 publications

(72 citation statements)

References 13 publications

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“…Dias-Filho (2002) observed maximum gross leaf photosynthetic rates of 30 µmol CO 2 m -2 s -1 for the grass 'Marandu' in a greenhouse.…”

Section: Gas Exchangementioning

confidence: 82%

Effects of silicon (Si) fertilization on gas exchange and production in Brachiaria

Sarto¹,

Lana²,

Rampim³

et al. 2016

Aust J Crop Sci

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Calcium silicate (CaSiO 3 ) applied to the soil may increase Si content in the soil and plants, as well as reduce sweating and increase water use efficiency. In this study, we aimed to investigate whether the application of CaSiO 3 increased Si content in plants and interfered with gas exchange and production components in Brachiaria. The experiment was performed using 8-L plastic pots in a greenhouse. Treatments were arranged in a randomized block design in a 3 × 5 factorial: three soils (Rhodic Acrudox, Rhodic Hapludox, and Arenic Hapludult) and five silicate rates (0, 1, 2, 4, and 6 t ha -1 of CaSiO 3 /MgSiO 3 ) were used; four replications were performed. CaSiO 3 application to the soil increases Si concentration in the leaves. Si in plants reduces internal CO 2 concentration and increases the efficiency of water use and instantaneous carboxylation efficiency. In soils with low pH and a high Al +3 level, which is toxic, reduction in plant sweating increases the intrinsic efficiency of water use in Brachiaria. Si helped to alleviate the toxic effects of Al .

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“…Dias-Filho (2002) observed maximum gross leaf photosynthetic rates of 30 µmol CO 2 m -2 s -1 for the grass 'Marandu' in a greenhouse.…”

Section: Gas Exchangementioning

confidence: 82%

Effects of silicon (Si) fertilization on gas exchange and production in Brachiaria

Sarto¹,

Lana²,

Rampim³

et al. 2016

Aust J Crop Sci

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“…On noninterference, or non-shading, situations, the plant invests on leafs and increases its leaf area index; simultaneously, this greater leaf area confers a greater accumulation of photoassimilates and a resulting higher growth of the roots. On the other hand, when it perceives shading, the plant invests on elongating the cells of the culm, aiming at gaining height and accessing light (Dias-Filho, 2002). In that sense, it was observed that AMFs offer greater height, leaf area and higher radicular growth on coffee plants, which generated a reduction on the biomass accumulation by the U. brizantha plants.…”

Section: Resultsmentioning

confidence: 99%

Interference by Palisade Grass on Coffee Seedlings Inoculated with Arbuscular Mycorrhizal Fungi

et al. 2016

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-The purpose of this paper was to evaluate the effects of the interference by Urochloa brizantha on coffee seedlings inoculated with arbuscular mycorrhizal fungi. A randomized block design and a 4 x 2 layout was used, where factor A was constituted by seedlings inoculated with Rhizophagus clarus, Claroideoglomus etunicatum and Dentiscutata heterogama, as well as some that were not inoculated, and factor B, constituted by plants in competition or alone. The sowing was conducted on washed sand to produce the coffee seedlings, which, during the matchstick stage, were transplanted into polyethylene bags, and inoculated when showing six pairs of leafs. Then, they were transplanted into pots where they were subjected to interference from two plants of U. brizantha for 90 days, during which time their growth and nutrient accumulation were evaluated on the leaves. As a result, an interaction between the following factors was observed: plant height, leaf area, shoot dry weight, dry weight for roots and P, Mg and Zn content in coffee seedlings. The damaging effect on the growth and P accumulation caused by the weed was reduced in coffee seedlings inoculated with mycorrhiza. Another conclusion was that the inoculation factor increases the competitive power of coffee seedlings. Keywords: Coffea arabica, Rhizophagus clarus, Claroideoglomus etunicatum, Dentiscutata heterogama,Urochloa brizantha. RESUMO -Objetivou-se com este trabalho avaliar os efeitos da interferência de

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“…The light compensation point (LCP) for the R biotype was estimated to be 15.84 μmol m -2 s -1 , whereas for the S biotype it was 33.77 μmol m -2 s -1 ( Figure 1B). QY and LCP indicate that the R biotype is more effective in using light energy to assimilate CO 2 and it presents a positive balance in fixing carbon under low luminosity (Dias-Filho, 2002). This may be a competitive advantage for the R biotype in quickly occupying space and establish itself first in the competition, compared to biotype S.…”

mentioning

confidence: 95%

Photosynthetic Performance of Glyphosate Resistant and Glyphosate Susceptible Hairy Fleabane under Light Intensity

et al. 2018

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-Herbicide resistance can confer lower competitive abilities; however scarse information is available about the photosynthetic performance between glyphosate-resistant and -susceptible hairy fleabane biotypes coming from areas with similar weed management history. Thus, the goal was to evaluate the photosynthetic performance under different light intensities between glyphosateresistant and -susceptible hairy fleabane biotypes, from RR soybean fields with a similar weed management history. The tested factors were glyphosate resistant and susceptible biotypes and 12 levels of photosynthetic photon flux density. Plants were cultivated in plastic cups, and at the stage of 10-12 leaves they were subjected to treatments with artificial lighting systems. The net photosynthetic rate, stomatal conductance, substomatal CO 2 concentration, transpiration rate, instantaneous water use efficiency, light compensation point and quantum yield were evaluated. In all the evaluated photosynthetic parameters, biotype R showed superior characteristics compared to susceptible biotypes, with the exception of the transpiration rate, where there were no differences. The differences between biotypes may not be associated to glyphosate resistance or susceptibility, but to the evolutionary characteristics of the biotypes.Keywords: Conyza bonariensis, ecological adaptability, photosynthetic photon flux; carbon assimilation rate, gas exchange, light response curve. RESUMO -

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Photosynthetic light response of the C4 grasses Brachiaria brizantha and B. humidicola under shade

Cited by 85 publications

References 13 publications

Effects of silicon (Si) fertilization on gas exchange and production in Brachiaria

Effects of silicon (Si) fertilization on gas exchange and production in Brachiaria

Interference by Palisade Grass on Coffee Seedlings Inoculated with Arbuscular Mycorrhizal Fungi

Photosynthetic Performance of Glyphosate Resistant and Glyphosate Susceptible Hairy Fleabane under Light Intensity

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