Biochemical compounds and enzymatic systems related to tolerance to water deficit of maize seedlings

Prazeres, Camila Segalla; Coelho, Cileide Maria Medeiros; Souza, Clóvis Arruda

doi:10.1007/s40502-021-00602-3

Cited by 5 publications

(6 citation statements)

References 27 publications

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“…It is urgent to understand the adaptive mechanism and search for effective techniques to avoid or mitigate the damaging effect of both drought and flooding on maize growth in the area. A significant amount of ROS buildup occurred when maize suffered from WS, similar to previous studies [12,45,46]; however, regardless of WS or not, plant development duration increased O2 − and decreased H2O2 accumulation, which was different from previous studies that maize had accumulated a higher ROS at V3 than V5 [12,16] or gradually improved with growth stage and stress duration [18,47]. The distinctly different responses of maize may result from a self-regulation compensation mechanism of different genotypes to enable plants to tolerate the damage from WS or the environment [48].…”

Section: Discussionsupporting

confidence: 89%

“…A low SOD activity led the plants to convert less O 2 − to H 2 O 2 . Meanwhile, although a high POD activity was detected, high APX has been identified as a key antioxidant enzyme to contribute the most tolerance to WS [ 3 , 45 ], as well as stress duration, which could still convert more H 2 O 2 to oxygen. Eventually, more O 2 − and less H 2 O 2 , accompanied by a higher increment of O 2 − than the reduction of H 2 O 2 , were accumulated with the progression of WS in the study.…”

Section: Discussionmentioning

confidence: 99%

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Exogenous Glycinebetaine Regulates the Contrasting Responses in Leaf Physiochemical Attributes and Growth of Maize under Drought and Flooding Stresses

Wang,

Ahmad,

Wang

et al. 2024

Biology

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Flooding and drought are the two most devastating natural hazards limiting maize production. Exogenous glycinebetaine (GB), an osmotic adjustment agent, has been extensively used but there is limited research on its role in mitigating the negative effects of different abiotic stresses. This study aims to identify the different roles of GB in regulating the diverse defense regulation of maize against drought and flooding. Hybrids of Yindieyu 9 and Heyu 397 grown in pots in a ventilated greenhouse were subjected to flooding (2–3 cm standing layer) and drought (40–45% field capacity) at the three-leaf stage for 8 d. The effects of different concentrations of foliar GB (0, 0.5, 1.0, 5.0, and 10.0 mM) on the physiochemical attributes and growth of maize were tested. Greater drought than flooding tolerance in both varieties to combat oxidative stress was associated with higher antioxidant activities and proline content. While flooding decreased superoxide dismutase and guaiacol peroxidase (POD) activities and proline content compared to normal water, they all declined with stress duration, leading to a larger reactive oxygen species compared to drought. It was POD under drought stress and ascorbate peroxidase under flooding stress that played crucial roles in tolerating water stress. Foliar GB further enhanced antioxidant ability and contributed more effects to POD to eliminate more hydrogen peroxide than the superoxide anion, promoting growth, especially for leaves under water stress. Furthermore, exogenous GB made a greater increment in Heyu 397 than Yindieyu 9, as well as flooding compared to drought. Overall, a GB concentration of 5.0 mM, with a non-toxic effect on well-watered maize, was determined to be optimal for the effective mitigation of water-stress damage to the physiochemical characteristics and growth of maize.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Exogenous Glycinebetaine Regulates the Contrasting Responses in Leaf Physiochemical Attributes and Growth of Maize under Drought and Flooding Stresses

Wang,

Ahmad,

Wang

et al. 2024

Biology

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“…Consequently, ooding deregulated ROS scavenging machinery accompanied by a numerous accumulation of ROS associated with lower SOD and POD activities and proline content and ultimately reduced the tolerance of maize showing lower D value compared with drought. In addition, it was also further con rmed that it was APX under ooding and POD under drought screened out by a stepwise regression analysis that played the most key role in maize to combat the WS damages in the study same as proposed by prior studies [3,43,45]. Moreover, APX activity was signi cantly positively correlated with morphological parameters and biomass in all treatments, also revealing its importance in resisting WS.…”

Section: Discussionsupporting

confidence: 64%

“…When maize suffers from WS, its physiology and morphology occur a series of changes due to damage [7,42], which the most typical damage for plants is oxidative damage [13]. Overproduction of ROS during water scarcity induces signi cant levels of oxidative stress in plants, damaging the cell membrane system, causing membrane lipid peroxidation, and either inhibiting plant growth or causing plant death [43,44].…”

Section: Discussionmentioning

confidence: 99%

Exogenous Glycinebetaine Mediated Tolerance Mechanism Regulates the Contrasting Responses to Drought and Flooding Stresses in Leaf Physiochemical Attributes and Growth of Maize

Wang,

Ahmad,

Wang

et al. 2024

Preprint

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Background Flooding and drought are the two most devastating natural hazards limiting maize production. Exogenous glycinebetaine (GB), an osmotic adjustment agent, has been extensively used but limits focus on its role in mitigating the negative effects of different abiotic stress. The study aims to identify the different roles of GB in regulating the diverse defense mechanisms of maize against drought and flooding. Methods Hybrids of Yindieyu 9 and Heyu 397 grown in pots in a ventilated greenhouse were subjected to flooding (2–3 cm standing layer) and drought (40–45% field capacity) at the three-leaf stage for 8 d. The effects of different concentrations of foliar GB (0, 0.5, 1.0, 5.0, 10.0 mM) on the physiochemical attributes and growth of maize were tested. Results Both varieties were verified to have greater drought tolerance to combat oxidative stress associated with higher antioxidant activities, and proline content than flooding. While flooding decreased superoxide dismutase, peroxidase activities, and proline content, those all declined with stress duration, leading to a larger reactive oxygen species than drought. Heyu 397 was verified to be more sensitive to drought and flooding than Yindieyu 9. It was peroxidase under drought and ascorbate peroxidase under flooding that played crucial roles in tolerating water stress. Foliar GB further enhanced antioxidant ability which contributed the most effect to peroxidase to eliminate more hydrogen peroxide than superoxide anion under water stress, promoting growth especially for leaf. Furthermore, exogenous GB made a greater increment on Heyu 397 than Yindieyu 9 as well as flooding than drought. Conclusion Overall, a GB concentration of 5.0 mM with a non-toxic effect on well-watered maize was determined to be optimal for the effective mitigation of water stress damage to the physiochemical characteristics and growth of maize.

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“…Genotypes with greater vigor are more efficient in using reserves to form normal seedlings (Ehrhardt-Brocardo and Coelho, 2016; Andrade et al, 2019). Maize plants Journal of Seed Science, v.44, e202244019, 2022 from high seed vigor demonstrated a greater capacity to combat oxidative stress with the accumulation of proline and increased activity of antioxidant enzymes (Prazeres et al, 2021). According to Nerling et al (2018), genetic divergence related to physiological quality and biochemical composition indicated that genetic diversity between inbred lines also leads to differences in metabolism associated with maize seed germination.…”

Section: Resultsmentioning

confidence: 99%

The hydrolysis dynamic of storage reserves in maize seed germination helps to explain differences in inbred lines and hybrid seed vigor

2022

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Storage reserves composition is directly related to the manifestation of seed vigor. However, the physiological potential expression in inbred lines, as well as hybrids from the storage reserves hydrolysis, is not clear. Thus, the aim of this study was focused on verifying if there are differences in the hydrolysis of seed storage reserve of maize inbred lines or hybrids during germination, and also checking if the changes in hydrolysis are associated with seed vigor. The seeds of inbred lines and hybrids were submitted to germination test, vigor by accelerated aging and cold tolerance. Biochemical profiling (total protein content, soluble proteins, phytate, inorganic phosphorus, starch, and soluble sugars), was temporally determined at 0 h (quiescent seeds), 12 h, 24 h, 30 h, and 48 h after imbibition. The seeds of inbred lines showed a longer time for root protrusion and less vigor when compared to hybrids. The highest hydrolysis rates in inbred lines were observed in phase I and at the end of phase II of germination. In hybrids, the rates remained, on average, constant throughout germination. The greatest differences in the hydrolysis of reserve compounds occur in phase II of germination and differentiate the germination metabolism of hybrids and inbred lines.

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Biochemical compounds and enzymatic systems related to tolerance to water deficit of maize seedlings

Cited by 5 publications

References 27 publications

Exogenous Glycinebetaine Regulates the Contrasting Responses in Leaf Physiochemical Attributes and Growth of Maize under Drought and Flooding Stresses

Exogenous Glycinebetaine Regulates the Contrasting Responses in Leaf Physiochemical Attributes and Growth of Maize under Drought and Flooding Stresses

Exogenous Glycinebetaine Mediated Tolerance Mechanism Regulates the Contrasting Responses to Drought and Flooding Stresses in Leaf Physiochemical Attributes and Growth of Maize

The hydrolysis dynamic of storage reserves in maize seed germination helps to explain differences in inbred lines and hybrid seed vigor

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