Limitações fotossintéticas em folhas de cafeeiro arábica promovidas pelo déficit hídrico

Peloso, Anelisa de Figueiredo; Tatagiba, Sandro Dan; Reis, Edvaldo Fialho dos; Pezzopane, José Eduardo Macedo; Amaral, José Francisco Teixeira do

doi:10.25186/cs.v12i3.1314

Cited by 18 publications

(11 citation statements)

References 13 publications

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“…As seen in the present study, Peloso et al (2017) observed a directly proportional relationship between A and gs, where the gs increase provided higher A values in a coffee crop. Similarly, Barboza and Teixeira Filho (2017) reported that E was higher as sugarcane gs increased.…”

Section: Ecw (Ds Msupporting

confidence: 85%

Agronomic performance and gaseous exchanges of the radish under saline stress and ascorbic acid application

Leal

Sousa

Silva

et al. 2019

Rev. Colomb. Cienc. Hortic.

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The radish is a short-cycle vegetable that has excellent nutritional and medicinal properties. It is considered rustic, meaning it tolerates adverse conditions with the possibility of being irrigated with saline water, which creates stress. In this context, this study aimed to evaluate the effect of electrical conductivities in irrigation water and doses of ascorbic acid on the agronomic performance and gaseous exchanges of radishes. This experiment was carried out in a protected environment at the Agricultural Sciences Center of the Federal University of Paraíba, Areia, Paraíba (Brazil). The experiment design used randomized blocks with five doses of ascorbic acid (0.0, 0.29, 1.0, 1.71 and 2.0 mM) and five electrical conductivities in the irrigation water (0.5, 1.3, 3.25, 5.2 and 6.0 dS m-1), with four replicates. The growth, gas exchange and production were evaluated. The doses of ascorbic acid were not significant. The increase in the electrical conductivities of the irrigation water provided a reduction in the agronomic performance and gas exchanges, except for the net photosynthesis, water use efficiency and instantaneous carboxylation efficiency, which were not significant. There was a relationship between the net photosynthesis, transpiration, internal concentration of CO2 and water use efficiency and the stomatal conductance. The agronomic performance and gaseous exchanges of the radish culture were influenced by the salinity. The foliar application of ascorbic acid did not influence the agronomic yield and gaseous exchanges of the radishes at the tested doses.

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Section: Ecw (Ds Msupporting

confidence: 85%

Agronomic performance and gaseous exchanges of the radish under saline stress and ascorbic acid application

Leal

Sousa

Silva

et al. 2019

Rev. Colomb. Cienc. Hortic.

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“…Single drought impact was further noted in the SWD plants in PSII photochemical efficiency (F v /F m , F v '/F m ') and inactivation (F s /F m '), the energy use to photosynthesis (Y (II) , q L ), and the need for thermal energy dissipation (Y (NPQ) ), with a global lesser impact in Icatu than in CL153, in agreement with the somewhat lower A max impact. Still, in both genotypes, the significant decline of Y (II) reflected a lower use of energy for ATP and NADPH synthesis (Peloso et al, 2017), in line with the very low P n values. Such lower photochemical use of energy was compensated for by the reinforcement of thermal dissipation mechanisms at the PSII level, reflected in strong Y (NPQ) rise, which protects the coffee leaves from excessive excitation damages (Pompelli et al, 2010;Silva et al, 2015).…”

Section: Impact Of Severe Drought On the Water Status And Photosynthementioning

confidence: 60%

Resilient and Sensitive Key Points of the Photosynthetic Machinery of Coffea spp. to the Single and Superimposed Exposure to Severe Drought and Heat Stresses

et al. 2020

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This study unveils the single and combined drought and heat impacts on the photosynthetic performance of Coffea arabica cv. Icatu and C. canephora cv. Conilon Clone 153 (CL153). Well-watered (WW) potted plants were gradually submitted to severe water deficit (SWD) along 20 days under adequate temperature (25/20°C, day/night), and thereafter exposed to a gradual temperature rise up to 42/30°C, followed by a 14-day water and temperature recovery. Single drought affected all gas exchanges (including A max) and most fluorescence parameters in both genotypes. However, Icatu maintained F v /F m and RuBisCO activity, and reinforced electron transport rates, carrier contents, and proton gradient regulation (PGR5) and chloroplast NADH dehydrogenase-like (NDH) complex proteins abundance. This suggested negligible non-stomatal limitations of photosynthesis that were accompanied by a triggering of protective cyclic electron transport (CEF) involving both photosystems (PSs). These findings contrasted with declines in RuBisCO and PSs activities, and cytochromes (b 559 , f, b 563) contents in CL153. Remarkable heat tolerance in potential photosynthetic functioning was detected in WW plants of both genotypes (up to 37/28°C or 39/30°C), likely associated with CEF in Icatu. Yet, at 42/30°C the tolerance limit was exceeded. Reduced A max and increased C i

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“…Ψw pd as low as -1.0 MPa or -1.5 MPa has been shown to be insufficient to cause a decrease in A in the coffee crop (DaMATTA; RAMALHO, 2006). The reduction in A, especially under moderate deficits, occurred with a proportional reduction in g s ( Figure 2B), and a progressive decrease of Ψw pd was noted by Peloso et al (2017). Stomata closure is routinely considered a primary indicator of water deficiency (OLIVEIRA; OLIVEIRA; CASTRO, 2009) and is a mechanism that prevents excessive water loss (VINASCO; BUILES; GUERRERO, 2016) because of the increase in the DPV, with maximum values of g s occurring at DPV close to 2 kPa (MELKE; FETENE, 2014).…”

Section: Resultsmentioning

confidence: 97%

Flowering Percentage in Arabica Coffee Crops Depends on the Water Deficit Level Applied During the Pre-Flowering Stage1

Ronchi

Miranda

2020

Rev. Caatinga

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Nonuniform flowering leads to uneven ripening of fruits, which impairs harvesting efficiency and the quality of the coffee. The aim of this study was to determine the water deficit level required to break flower bud dormancy of Coffea arabica and to evaluate its effects on gas exchange, photosynthetic pigment levels, coffee yield, and fruit maturation. After a growth period of 18 months in 200 L pots maintained under greenhouse conditions, water deficit treatments were imposed by withholding watering from plants exhibiting at least a 60% rate of "E4 stage" flower buds. When five groups of six coffee plants reached the pre-dawn leaf water potential (Ψwpd) of -0.04, -0.65, -1.43, -1.96, and -2.82 MPa, the leaf gas exchange was measured and leaf disks were collected to quantify the photosynthetic pigment levels, after which, watering was resumed. The rate of opened flowers increased with the reduction of Ypd based on the mathematical model, Y = 67.064 + 20.660 x ln(-Ψwpd). The leaf gas exchange was strongly affected by water deficit levels, without any alterations in the photosynthetic pigment levels. Coffee yield was not affected by the treatments but the ripe stages of cherries increased slightly with the reduction in Ψwpd. The water deficit level applied at the pre-flowering stage determined the percentage of flowering in C. arabica.

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Limitações fotossintéticas em folhas de cafeeiro arábica promovidas pelo déficit hídrico

Cited by 18 publications

References 13 publications

Agronomic performance and gaseous exchanges of the radish under saline stress and ascorbic acid application

Agronomic performance and gaseous exchanges of the radish under saline stress and ascorbic acid application

Resilient and Sensitive Key Points of the Photosynthetic Machinery of Coffea spp. to the Single and Superimposed Exposure to Severe Drought and Heat Stresses

Flowering Percentage in Arabica Coffee Crops Depends on the Water Deficit Level Applied During the Pre-Flowering Stage1

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