Morfofisiologia de plantas de milho em competição com picão-preto e trapoeraba submetidas a roçada

Lemos, João Paulo; Galvão, João Carlos Cardoso; Silva, Antônio Alberto da; Fontanétti, Anastácia; Corrêa, M. L. P.; Cecon, Paulo R.

doi:10.1590/s0100-83582012000300004

Cited by 9 publications

(8 citation statements)

References 17 publications

(13 reference statements)

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“…When the plant goes through a climatic condition in which there is low relative humidity, there is an increase in the atmosphere evaporative demand (greater vapor pressure deficit -VPD) (Lemos et al, 2012). This characteristic has a direct relationship with stomatal condutance, the increase in VPD leads to stomatal closure, in order to prevent excessive transpiration and photosynthetic rate decreases.…”

Section: Discussionmentioning

confidence: 99%

Physiological aspects and yield in coffee progenies with large beans

Pavan

Santos

Freitas

et al. 2021

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Genetic coffee breeding is aimed at increasing yield associated with tolerance or resistance to biotic and abiotic factors, besides providing a better beverage quality and supplying the demand for bigger beans. The efficiency in photosynthetic activity can limit produce and diversify genotypes, mainly under adverse environmental conditions. Consequently, the importance of selection of Coffea arabica L. regarding these characteristics stands out. Therefore, the objective of this paper was to measure the physiological characterization and yield of Coffea arabica L. progenies with large beans "Big Coffee VL". Twelve productive progenies were selected and classified according to fruit size ("small", "medium" and "large"), which were: S14,

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Section: Discussionmentioning

confidence: 99%

Physiological aspects and yield in coffee progenies with large beans

Pavan

Santos

Freitas

et al. 2021

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“…Photosynthesis rates obtained in the present study are similar to those found elsewhere, taking into account different varieties and phenological stages (Lopes et. al., 2009;Lemos et al, 2012). Corn is a mesotrione -tolerant crop due to its metabolic capacity to detoxify these molecules, producing compounds without herbicide activity (Johnson et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

“…Gas exchange measurement is a powerful tool for studying herbicide selectivity/phytotoxicity in corn plants since it demonstrates photosynthetic performance (Lemos et al, 2012). Chlorophyll a fluorescence have been widely used because is a non-destructive method and also allows qualitative and quantitative analysis of the absorption, partitioning and use of the light energy in photosystem II (PSII) and possible effects on photosynthetic capacity (Mouget and Tremblin, 2002;Netto et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Physiological aspects of corn plants related to mesotrione herbicide selectivity

Freitas¹,

Rodrigues²,

Freitas³

et al. 2016

Aust J Crop Sci

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The objective of the present study was to assess the physiological aspects related to the activity of mesotrione herbicide at different doses in corn plants. The experiment was performed, in a greenhouse, on UENF 506-8 hybrid grown in 12 L pots with substrate (2:1 sand and clay). A randomized complete block design in a 3 x 5 factorial scheme, with four replications was used. Plants at fourth leaf stage were exposed to three doses (0, 0.15 and 0.30 kg ha -1) of herbicide mesotrione. Three, four, five, six and 13 days after application (DAA) of herbicide mesotrione gas exchange and chlorophyll a fluorescence (considering a JIP Test analysis) were measured. Plant height (PH), leaf area (LA), canopy (CDM) and root dry matter were measured at 28 DAA, when plants were at V12 stage and ca. 85 to 90% grown of its total area. The results showed that UENF 506-8corn hybrid was remarkably tolerant to dose of 0.15 Kg ha -1 without deleterious effects on photochemistry and biochemistry path way, maintaining the values of several JIP Test parameters and gas exchange. However, decreases in photosynthetic rate, stomata conductance, and transpiration and several JIP Test parameters were observed when the plants were exposed to dose of 0.30 kg ha -1 although there was no harmful damage on most of the growth parameters. However, dose of 0.15 Kg ha -1 should be recommended since dose as high as 0.30 kg ha -1 caused decrease in CDM. /C a _internal-to-ambient CO 2 concentration ratio, F v /F m _ maximum PSII efficiency, ABS/RC_amount of energy absorbed by the pigments in the PSII antenna complex, per unit of active reaction center, DI o /RC_dissipated energy per unit of active reaction center, RC/CS o _number of active reaction centres per cross, ET o /CS o _ energy distribution ratio per transversal section from sample, PH_plant height, LA_leaf area, CDM_canopy dry matter, RDM_root dry matter.

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“…However, during this experiment, the average air temperature was above 40⁰C in some phases. Lemos et al (2012) state that these conditions can increase the value of the vapor pressure deficit and stomatal closure, and consequently, the reduction in sweating.…”

Section: Gas Exchanges In Coffee Trees Between 12 and 13hmentioning

confidence: 99%

“…However, the average air temperature above 40⁰C, during the experiment, remained well above the range considered as optimal for the growth of coffee plants. Situations like these can increase the value of the vapor pressure deficit and cause stomatal closure, to reduce excess sweating (Lemos et al, 2012).…”

Section: Source: Authorsmentioning

confidence: 99%

Relationship of gas exchanges in different phenological phases with coffee productivity in the Cerrado

Ávila

Sousa

Pereira

et al. 2020

RSD

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Coffee growing has been expanding in the Brazilian Cerrado. To identify genotypes adapted to the conditions, in 2015, an experiment was implanted with 35 genotypes of Coffea arabica, irrigated, in Ceres, Goias, Brazil, latitude 15°21′00.67′′, longitude: 49°35′56.98′′, Altitude approximately 570 m. The coffee trees showed differences in growth and, in the first harvest, were grouped into low, medium and high productivity. Seeking to understand the divergences in growth and productivity between coffee trees, gas exchange between 9:00 - 10:00 h was evaluated; 12:00 - 13:00 h and 15:00 - 16:00 h, in five phenological phases of the second harvest (fruit formation, fruit filling, maturation, after harvest and vegetative phase), of three coffee trees (Sarchimor MG 8840, Catucaí Amarelo 2SL and IBC - Palma 2) with high, medium and low productivity, respectively, in the first harvest. The genotypes showed the same pattern of productivity in the first and second crop. Gas exchange in coffee trees, with different productive potential, grown in the Cerrado, under irrigation, varied between genotypes and phenological phases. The best results prevailed in the formation and filling phases of the fruits. Variation of the genotypes was observed between the phenological phases. Despite the differences found, gas exchange does not explain the divergences in the growth and production responses of the studied genotypes, indicating the involvement of other factors in the growth and productivity of coffee trees cultivateds in the Cerrado.

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Morfofisiologia de plantas de milho em competição com picão-preto e trapoeraba submetidas a roçada

Cited by 9 publications

References 17 publications

Physiological aspects and yield in coffee progenies with large beans

Physiological aspects and yield in coffee progenies with large beans

Physiological aspects of corn plants related to mesotrione herbicide selectivity

Relationship of gas exchanges in different phenological phases with coffee productivity in the Cerrado

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