Water Stress and Agriculture

Zingaretti, Sônia Marli; Inácio, Marielle Cascaes; Pereira, Lívia de Matos; Paz, Tiago Antunes; França, Suzelei de Castro

doi:10.5772/53877

Cited by 11 publications

(2 citation statements)

References 127 publications

(90 reference statements)

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“…Upon exposure to drought, the functions of photosystem I (PSI) and photosystem II (PSII) and the electron transport from PSII to PSI are influenced depending on the drought tolerance of plant species [11]. A number of in vivo investigations have revealed that drought stress causes significant damage to the oxygen-evolving complex (OEC) [31,32], dissociation of the light-harvesting complex of PSII (LHCII) from the reaction centers of PSII [33], and D1 polypeptide degradation, which results in the donor and acceptor side changes of PSII and a decrease in its photochemical efficiency [28,[34][35][36][37][38]. The levels of PSII reaction center proteins and the light-harvesting complexes of PSI (LHCI) and PSII (LHCII) diminished significantly owing to the water deficiency as a result of the influence on their biosynthesis and degradation [28,39].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of the Photosynthetic Apparatus in Maize and Sorghum under Different Drought Levels

Stefanov

Rashkov

Borisova

et al. 2023

Plants

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Drought is one of the main environmental stress factors affecting plant growth and yield. The impact of different PEG concentrations on the photosynthetic performance of maize (Zea mays L. Mayflower) and sorghum (Sorghum bicolor L. Foehn) was investigated. The activity of the photosynthetic apparatus was assessed using chlorophyll fluorescence (PAM and JIP test) and photooxidation of P700. The data revealed that water deficiency decreased the photochemical quenching (qP), the ratio of photochemical to nonphotochemical processes (Fv/Fo), the effective quantum yield of the photochemical energy conversion in PSII (ΦPSII), the rate of the electron transport (ETR), and the performance indexes PItotal and PIABS, as the impact was stronger in sorghum than in maize and depended on drought level. The PSI photochemistry (P700 photooxidation) in sorghum was inhibited after the application of all studied drought levels, while in maize, it was registered only after treatment with higher PEG concentrations (30% and 40%). Enhanced regulated energy losses (ΦNPQ) and activation of the state transition under drought were also observed in maize, while in sorghum, an increase mainly in nonregulated energy losses (ΦNO). A decrease in pigment content and relative water content and an increase in membrane damage were also registered after PEG treatment. The experimental results showed better drought tolerance of maize than sorghum. This study provides new information about the role of regulated energy losses and state transition for the protection of the photosynthetic apparatus under drought and might be a practical approach to the determination of the drought tolerance of plants.

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Section: Introductionmentioning

confidence: 99%

Sensitivity of the Photosynthetic Apparatus in Maize and Sorghum under Different Drought Levels

Stefanov

Rashkov

Borisova

et al. 2023

Plants

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“…Abiotic stresses at the grand growth stage cause a variable drop in cane and sugar production but a continual decline in sucrose content ( Wiedenfeld, 2000 ). During the grand growth stage, tiller formation and development occur, together with shoot length and basal sucrose accumulation and thus this is known to be a critical stage for heat sensitivity due to the plant demanding the optimum temperature for growth and maximum sucrose concentration ( Zingaretti et al., 2013 ).…”

Section: Introductionmentioning

confidence: 99%

Expression of sucrose metabolizing enzymes in different sugarcane varieties under progressive heat stress

Mehdi,

Liu,

Riaz

et al. 2023

Front. Plant Sci.

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Studying the thermal stress effect on sucrose-metabolizing enzymes in sugarcane is of great importance for understanding acclimation to thermal stress. In this study, two varieties, S2003-US-633 and SPF-238, were grown at three different temperatures ( ± 2°C): 30°C as a control, 45°C for various episodes of high temperature treatments and recovery conditions at 24, 48 and 72 hours. Data showed that reducing sugar content increased until the grand growth stage but sharply declined at the maturity stage in both cultivars. On the other hand, sucrose is enhanced only at the maturity stage. The expression of all invertase isozymes declined prominently; however, the expression of SPS was high at the maturity stage. Hence, the sucrose accumulation in mature cane was due to increased SPS activity while decreased invertase isozymes (vacuolar, cytoplasmic and cell wall) activities at maturity stage in both cultivars. Heat shock decreased the sucrose metabolizing enzymes, sucrose content and sugar recovery rate in both cultivars. In contrast, heat-shock treatments induced maximum proline, MDA, H2O2 and EC in both cultivars. Notably, this is the first report of diverse invertase isozyme molecular weight proteins, such as those with 67, 134 and 160 kDa, produced under heat stress, suggesting that these enzymes have varied activities at different developmental stages. Overall, S2003-US-633 performs better than the cultivar SPF-238 under heat stress conditions at all development stages, with increased sucrose content, enzyme expression, proline and sugar recovery rate. This work will provide a new avenue regarding sugarcane molecular breeding programs with respect to thermal stress.

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Deployment of Benign Bacterial Strains to Improve Soil Productivity Under Drought Stress

2021

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Water Stress and Agriculture

Cited by 11 publications

References 127 publications

Sensitivity of the Photosynthetic Apparatus in Maize and Sorghum under Different Drought Levels

Sensitivity of the Photosynthetic Apparatus in Maize and Sorghum under Different Drought Levels

Expression of sucrose metabolizing enzymes in different sugarcane varieties under progressive heat stress

Deployment of Benign Bacterial Strains to Improve Soil Productivity Under Drought Stress

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