Antioxidant activity and fermentative metabolism in the plant Erythrina crista-galli L. under flood conditions

Larré, Cristina Ferreira; Moraes, Caroline Leivas; Borella, Júnior; Amarante, Luciano do; Deuner, Sidnei; Peters, José Antônio

doi:10.5433/1679-0359.2016v37n2p567

Cited by 8 publications

(5 citation statements)

References 14 publications

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“…Quanto ao alagamento, não houve a mesma recuperação, o que pode ter ocorrido pelo acúmulo de substância tóxicas como o lactato e etanol nos tecidos vegetais (LARRÉ et al, 2016). Além disso, o alagamento proporciona maior comprometimento do sistema radicular (Figura 1C), o que reduz a capacidade da planta na absorção de nutrientes e translocação de carboidratos de reservas, que são importantes nos momentos de estresse.…”

Section: Discussionunclassified

TOLERÂNCIA DE CULTIVARES DE Megathyrsus maximus AO ESTRESSE HÍDRICO

Righi,

Gomes,

Mota

et al. 2024

NAT

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O Brasil é um país com grande diversidade edafoclimática, de modo que a pecuária pode estar localizada em regiões sujeitas ao déficit hídrico e alagamento. Diante disso, é importante conhecer a resposta dos cultivares forrageiros a estas condições de estresse hídrico. Sendo assim, objetivou-se com esse trabalho identificar qual a tolerância ao estresse hídrico (déficit hídrico e alagamento) de cultivares de Megathyrsus maximus. O delineamento experimental utilizado foi o delineamento inteiramente casualizado, com nove tratamentos e quatro repetições, dispostos em esquema fatorial 3x3. Foram testados três cultivares de Megathyrsus maximus (Tamani, Zuri e Quênia), submetidos a três condições hídricas (déficit hídrico, sem estresse hídrico e alagamento). Todas as gramíneas reduziram a produção de massa de forragem quando submetidas ao estresse hídrico (déficit e alagamento). O capim Tamani foi a gramínea com maior redução na massa de forragem diante de alagamento. O perfilhamento e o filocrono do capim do Zuri não foram afetados pelo estresse hídrico e, após o estresse, restabeleceu o número de folhas emitidas, independentemente do tipo de estresse. Todos os capins recuperaram a massa de forragem após o déficit hídrico, contudo, houve comprometimento no desenvolvimento após o alagamento. Dessa forma, todos os capins têm baixa tolerância ao déficit hídrico, mas são capazes de recuperar após o estresse. Dos cultivares testados, o capim Tamani é o cultivar de Megathyrsus maximus com menor tolerância ao alagamento e o Zuri é o capim com maior tolerância ao estresse hídrico. Palavras-chave: alagamento; déficit hídrico; Panicum maximum. Tolerance of Megathyrsus maximus cultivars to water stress ABSTRACT: Brazil has great edaphoclimatic diversity, so that livestock can be located in regions subject to water deficit and flooding. Therefore, it is important to know the response of forage cultivars to these water stress conditions. Thus, this work aimed to identify the tolerance to water stress (water deficit and flooding) of some Megathyrsus maximus cultivars. The experimental design was completely randomized, with nine treatments and four replications arranged in a 3x3 factorial scheme. Three Megathyrsus maximus cultivars (Tamani, Zuri and Kenya) were tested and submitted to three water conditions (water deficit, without water stress and flooding. All grasses reduced forage mass production when subjected to water stress (deficit and flooding). Tamani grass had the greatest reduction in forage mass in the face of flooding. The tillering and phyllochron of Zuri grass were not affected by water stress; after stress, the number of leaves emitted was restored, regardless of the type of stress. All grasses recovered forage mass after the water deficit. However, there was compromised development after the flooding. In this way, all grasses have a low tolerance to water deficit but can recover after stress. Of the tested cultivars, Tamani grass is the cultivar of Megathyrsus maximus with the lowest tolerance to flooding, and Zuri is the grass with the highest tolerance to water stress. Keywords: flooding; water deficit; Panicum maximum.

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Section: Discussionunclassified

TOLERÂNCIA DE CULTIVARES DE Megathyrsus maximus AO ESTRESSE HÍDRICO

Righi,

Gomes,

Mota

et al. 2024

NAT

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“…Moreover, the decrease in F V /F M also contributes to the ROS occurrence, such as superoxide anions and H 2 O 2 , which damage chloroplast structures and, consequently, harm A (Yu et al, 2015). The balance between an increase in ROS production and the ability to respond to flood stress through the rapid activation of the antioxidant defense system is related to tolerance or adaptation to this limiting condition (Larré et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

“…Several enzymes are involved in ROS detoxification, such as superoxide dismutase, peroxidase, catalase, and ascorbate peroxidase, and plants with higher activities of this antioxidant system are possibly more resistant to oxidative damage (Hernandez et al, 2010;Alves et al 2013;Souza et al, 2013;Larré et al, 2016), favoring their recovery potential after stress.…”

Section: Introductionmentioning

confidence: 99%

Do Dipteryx alata Vogel seedlings recover the quality and the photosynthetic and antioxidant responses in the post-flooding?

et al. 2023

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Dipteryx alata Vogel is a tree species widely found in Cerrado, settling preferentially in well drained soils. Studies related to ecophysiology of D. alata may contribute to the decision making about using seedlings of this species in projects aimed at the recovery of degraded areas where seasonal flooding happens. This study aimed to assess the effects of flooding on photosynthetic and antioxidant metabolism and quality of D. alata seedlings cultivated or not under flooding during four assessment periods (0, 20, 40, and 60 days), followed by 100 days after the end of each assessment period (0+100, 20+100, 40+100, and 60+100 days), allowing verifying the potential for post-flooding recovery. Flooded plants showed lower photosynthetic efficiency than non-flooded plants, regardless of the periods of exposure. However, this efficiency was recovered in the post-flooding, with values similar to that of the non-flooded seedlings. Moreover, the damage to FV/FM was evidenced by an increase in the period of exposure to flooding, but recovery was also observed at this stage of the photosynthetic metabolism. Seedling quality decreased under flooding, not varying between periods of exposure, but remained lower although the increase observed in the post-flooding period, with no recovery after flooding. The occurrence of hypertrophied lenticels associated with physiological changes and an efficient antioxidant enzyme system might have contributed to the survival and recovery of these seedlings. Thus, this species is sensitive to flooding stress but capable of adjusting and recovering metabolic characteristics at 100 days after the suspension of the water stress, but with no recovery in seedling quality. Thus, we suggested plasticity under the cultivation condition and determined that the time of 100 days is not enough for the complete resumption of growth.

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“…Furthermore, for the stress periods, we can observe the ooding effect on the SOD enzyme increase since during the 2nd P0, the enzyme activity was 35.06% higher in the root. Larré et al (2016) showed the Si e ciency in mitigating water stress effects by activating enzyme activity that varies with the plant organ. Furthermore, they showed that the balance between an increase in the production of reactive oxygen species (ROS) and the ability to respond to stress by rapidly activating the antioxidant defense system relates to tolerance or adaptation to this limiting condition.…”

Section: Discussionmentioning

confidence: 99%

Does silicon inEugenia myrcianthes Nied. seedlings under water stress contribute in the tolerance and recovery?

Foresti

Scalon

Santos

et al. 2023

Preprint

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Purpose: Silicon (Si) could contribute to the stability of photosystem II processes and gas exchange. Moreover, it can increase antioxidant enzyme activity, maintaining the growth of E. myrcianthes under water fluctuation, favoring seedling tolerance and recovery after stress suspension. This study aimed to evaluate the silicon effect on E. myrcianthes subjected to water fluctuation and the potential recovery of photosynthetic and enzymatic metabolism and seedling growth after stress suspension. Methods: Two water regimes: continuous irrigation (I), with 75% of the water retention capacity of the substrate, and water stress (E), with irrigation suspension followed by flooding. The water regimes were associated with different Si concentrations: 0, 2, and 4 mmol L-1. The seedlings were evaluated in five periods: Time zero (T0), with initial evaluations and irrigation suspension; First photosynthesis close to zero under water deficit - 1st P0; First recovery - 1st REC; Second photosynthesis close to zero under flooding - 2nd P0; Second recovery - 2nd REC. Results: Water fluctuation negatively affected the photosynthetic and enzymatic metabolism of E. myrcianthes. However, we observed 100% survival of all seedlings, suggesting the physiological plasticity of the species. Applying 2 mmol L-¹ of silicon to the seedlings helped them tolerate the stressful effect of water fluctuation. Conclusion: Water stress decreased the development of E. myrcianthes seedlings, damaging the photochemical and biochemical metabolism of photosynthesis, increasing antioxidant enzyme activity, and reducing root growth and seedling quality. However, Si application at concentrations of 2 mmol L-¹ mitigated water stress effects, favoring seedling development and tolerance to water fluctuation. The species can adjust to stressful conditions and shows potential for survival and tolerance at this developmental stage, recovering its metabolism and growth after stress.

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Antioxidant activity and fermentative metabolism in the plant Erythrina crista-galli L. under flood conditions

Cited by 8 publications

References 14 publications

TOLERÂNCIA DE CULTIVARES DE Megathyrsus maximus AO ESTRESSE HÍDRICO

TOLERÂNCIA DE CULTIVARES DE Megathyrsus maximus AO ESTRESSE HÍDRICO

Do Dipteryx alata Vogel seedlings recover the quality and the photosynthetic and antioxidant responses in the post-flooding?

Does silicon inEugenia myrcianthes Nied. seedlings under water stress contribute in the tolerance and recovery?

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