Gas exchange and organic solutes in forage sorghum genotypes grown under different salinity levels

Coelho, Daniela Siqueira; Simões, Welson Lima; Salviano, Alessandra Monteiro; Mésquita, Alessandro Carlos; Alberto, K. da C.

doi:10.1590/1807-1929/agriambi.v22n4p231-236

Cited by 10 publications

(9 citation statements)

References 25 publications

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“…Physiological disturbances in glycophytes caused by salt stress were verified by Cha-um and Kirdmanee (2011) and Freire et al (2014), corroborating the results observed in passion fruit plants irrigated with saline water. The use of saline water in Vigna unguiculata and Sorghum bicolor also reduced the photosynthetic rate, as observed in the present study, attributed to the partial closure of the stomata (NEVES et al, 2009;SILVA et al, 2013;COELHO et al, 2018). Prolonged exposure to salts causes changes in the stomatal conductance of the plant, thereby limiting the influx of CO 2 into the mesophyll.…”

Section: Resultssupporting

confidence: 75%

“…One of the effects of salt stress is the reduction in the availability of water to plants, which causes significant decreases in photosynthetic activity, transpiration and stomatal conductance, and this condition is mainly related to stomatal closure. Neves et al (2009) and Silva et al (2013), studying cowpea and Coelho et al (2018) studying sorghum, also found that salt stress negatively affected plant transpiration.…”

Section: Resultsmentioning

confidence: 98%

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Salt stress on physiology, biometry and fruit quality of grafted Passiflora edulis

Moura¹,

Gheyi²,

Silva³

et al. 2020

Biosci. J.

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The production of grafted passion fruit is an alternative for plant adaptation to saline environments. The objective of this study was to evaluate the effect of salt stress on physiology, biometry and fruit quality of P. edulis grafted on Passiflora spp. The experiment was conducted in completely randomized design, in a 3 x 2 factorial scheme, corresponding to three species of Passiflora (P. edulis, P. gibertii and P. cincinnata) with P. edulis scion and two levels of irrigation water salinity (0.5 - control and 4.5 dS m-1), with four repetitions. Water salinity compromises gas exchanges (CO2 assimilation raste and transpiration) and physiological variables (total chlorophyll and total water consumption) in grafted P. edulis. The interaction between the factors (water salinity x species) compromised only the growth in plant height and number of leaves. In relation to the species, auto-grafted P. edulis stood out from the other species, with higher internal CO2 concentration, number of leaves, stem dry mass, peel thickness, total soluble solids (TSS) of the pulp and TSS/TA ratio (titratable acidity). Auto-grafted P. edulis under saline conditions develops vital mechanisms (TSS and TSS/TA), which attenuates the effects of salt stress on the physico-chemical quality of the fruits.

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Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 98%

Salt stress on physiology, biometry and fruit quality of grafted Passiflora edulis

Moura¹,

Gheyi²,

Silva³

et al. 2020

Biosci. J.

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“…Reductions in gas exchange of plants subjected to saline environments are associated with the osmotic effect on plant metabolism (Silva et al, 2013). Studies with fodder sorghum have shown that the continuous use of water with salinity above the threshold of the crop reduces the rate of transpiration due to partial closure of the stomata (Coelho et al, 2018). Liu et al (2015) reported a direct influence of salinity on the water and photosynthetic relationships of sorghum leaves.…”

Section: Discussionmentioning

confidence: 99%

Salinity decreases transpiration of sorghum plants

Guimarães

Simões

Barros³

et al. 2020

Exp Results

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Growing in a saline environment causes changes in important physiological processes that are directly related to plant growth and development. In this study we evaluated the effect of salinity on transpiration of sorghum plants in semi-arid conditions and found that the highest rates of transpiration were observed in the hottest hours of the day, between 10 a.m. and 3 p.m., with plants subjected to the saline environment having their transpiration reduced by up to 70% when compared to the non-saline environment. This behavior can be reflected in reductions in plant growth and development due to reduced water absorption by the roots, consequently causing an imbalance of nutrients in the plant due to low absorption rate and competition between nutrients and salts in the preferred routes of absorption in the roots.

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“…Its great genetic variability enables different responses when subjected to salt stress (Tabatabaei and Anagholi, 2012). These are reflected in physiological variables (stomatal conductance, transpiration rate and photosynthesis) (Freire et al, 2014), biometric variables (height, leaf area, biomass production) (Costa et al, 2019;Guimarães et al, 2019), and biochemical variables (osmoregulatory solutes, antioxidant enzymes) (Barbosa et al, 2014;Coelho et al, 2018).…”

Section: Sorghum (Sorghum Bicolor (L) Moench)mentioning

confidence: 99%

Gas Exchange and Enzymatic Metabolism in Grain Sorghum Varieties Irrigated With Saline Water

Guimarães¹,

Simões²,

Tabosa³

et al. 2020

RBMS

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The objective of this study was to evaluate the effect of irrigation water salinity on gas exchange and antioxidative system responses of grain sorghum varieties. An experiment was conducted in a greenhouse located at the headquarters of Embrapa Semiarid Agriculture, Petrolina-PE, Brazil. The experimental design was randomized blocks, in a 6 x 5 factorial scheme. Six varieties of grain sorghum irrigated with saline water with five levels of salinity were evaluated. Photosynthesis and transpiration rate, stomatal conductance, leaf temperature, intrinsic and instantaneous water use efficiency, relative water content and leaf turgor potential were evaluated, as well as the activity of the enzymes catalase, ascorbate peroxidase and superoxide dismutase, and shoot biomass production. It was observed that irrigation with saline water causes reduction in the gas exchange and water status of grain sorghum varieties. The antioxidative system was activated in the six sorghum varieties to avoid the accumulation of reactive oxygen species, and the synchronism between the enzymes led to a better response of shoot dry mass production of the Ponta Negra variety.

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Gas exchange and organic solutes in forage sorghum genotypes grown under different salinity levels

Cited by 10 publications

References 25 publications

Salt stress on physiology, biometry and fruit quality of grafted Passiflora edulis

Salt stress on physiology, biometry and fruit quality of grafted Passiflora edulis

Salinity decreases transpiration of sorghum plants

Gas Exchange and Enzymatic Metabolism in Grain Sorghum Varieties Irrigated With Saline Water

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