Expression pattern and physiological roles of Plastid Terminal Oxidase (PTOX) in wild and cultivated barley genotypes under drought stress

Ghotbi-Ravandi, Ali Akbar; Shariati, Mansour; Shobbar, Zahra‐Sadat; Shahbazi, Maryam

doi:10.1016/j.envexpbot.2019.03.007

Cited by 15 publications

(5 citation statements)

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“…In contrast, overexpression of PGR5 resulted in increased growth rates in diatoms under fluctuating light (Zhou et al, 2021) and enhanced high light and drought stress in Arabidopsis (Long et al, 2008). In addition, PTOX is also important as an alternative electron sink and for chloroplast biogenesis and carotenoid biosynthesis during early leaf development, and induction of its expression under stress conditions (summarized in Sun and Wen, 2011 and Johnson and Stepien, 2016; Ivanov et al, 2012; Li et al, 2016a; Ghotbi‐Ravandi et al, 2019) led to the suggestion that it could be a suitable target for enhancing stress tolerance in plants (Johnson and Stepien, 2016). However, initial experiments overexpressing PTOX in Arabidopsis and tobacco did not result in enhanced tolerance to high light stress but instead made plants more photosensitive (Joët et al, 2002; Rosso et al, 2006; Heyno et al, 2009; Ahmad et al, 2012, 2020).…”

Section: Improving Crop Yields Through Optimization Of Photosynthetic...mentioning

confidence: 99%

Here comes the sun: How optimization of photosynthetic light reactions can boost crop yields

Walter

Kromdijk

2022

JIPB

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Section: Improving Crop Yields Through Optimization Of Photosynthetic...mentioning

confidence: 99%

Here comes the sun: How optimization of photosynthetic light reactions can boost crop yields

Walter

Kromdijk

2022

JIPB

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“…These two cultivars are both spring and similar in terms of phenological characteristics. Our previous results suggested a poor dehydration tolerance (Karami et al, 2013;Ghotbi-Ravandi et al, 2019), as well as less WSC accumulation, dry matter translocation and remobilization efficiency of different internodes in Morocco 9-75 under severe drought stress compared to Yousef and the other studied lines and cultivars (Sarabadani Tafresh et al, 2019). Therefore, fructan accumulation and remobilization rate of the penultimate internode were studied in Morocco and Yousef under terminal drought stress.…”

Section: Core Ideasmentioning

confidence: 81%

Role of barley stem reserves in the maintenance of grain yield under terminal drought

et al. 2023

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Under terminal drought conditions, due to the limitation of current photosynthesis, the impact of cereal stem carbohydrates reserves and their contribution to the grain yield preservation could be enhanced. The role of stem fructan remobilization on yield of barley was examined under drought conditions in the present study. The fructan accumulation and remobilization rate of the penultimate internode were studied in Morocco 9–75 and Yousef, as drought susceptible and tolerant barley (Hordeum vulgare L.) cultivars, respectively. Drought stress increased the fructan accumulation and remobilization in Yousef, supporting it from severe yield loss compared to Morocco cultivar. Under drought stress conditions, during grain filling of Yousef cultivar, the strong correlations were observed between the relative expression of the key genes involved in the fructan metabolism, that is 1‐SST and 6‐SFT (fructan biosynthesis genes) with the fructan content, as well as between the expression of 1‐FEH (fructan exohydrolase) and SUT1 (sucrose transporter) with fructan remobilization. Yousef cultivar contained considerable water‐soluble carbohydrate content of stem internodes, and a rise in osmolytes such as fructan may lead to the efficient osmotic adjustment, which in turn resulted in the maintenance of the water content and stomatal conductance. Based on the results, enhanced fructan accumulation and its induced remobilization under drought conditions can play an important role in yield stability of Yousef under stress. The barley genotypes with high potential for fructan production and remobilization under terminal drought stress could provide the appropriate materials for drought tolerance breeding and screening for these traits.

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“…This appears to be attributed to the ability of DRL to transfer electrons to mitochondria during times of stress, promoting oxidative phosphorylation and supporting ATP synthesis, thus resisting drought stress 81 . Moreover, the reduction of the electron transport chain during photosynthetic processes was beneficial to reduce the production of ROS to a certain extent and to relieve cell pressure 82 …”

Section: Discussionmentioning

confidence: 99%

Integrative leaf anatomy structure, physiology, and metabolome analyses revealed the response to drought stress in sainfoin at the seedling stage

Yao,

Nan,

Wang

et al. 2024

Phytochemical Analysis

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IntroductionSainfoin (Onobrychis viciaefolia) is a vital legume forage, and drought is the primary element impeding sainfoin growth.ObjectiveThe anatomical structure, physiological indexes, and metabolites of the leaves of sainfoin seedlings with a drought‐resistant line of P1 (DRL) and a drought‐sensitive material of 2049 (DSM) were analyzed under drought (−1.0 MPa) with polyethylene glycol‐6000 (PEG‐6000).MethodsThe leaf anatomy was studied by the paraffin section method. The related physiological indexes were measured by the hydroxylamine oxidation method, titanium sulfate colorimetric method, thiobarbituric acid method, acidic ninhydrin colorimetric method, and Coomassie brilliant blue method. The metabolomics analysis was composed of liquid chromatography tandem high‐resolution mass spectrometry (LC‐MS/MS).ResultsThe results revealed that the thickness of the epidermis, palisade tissue, and sponge tissue of DRL were significantly greater than those of DSM. The leaves of DRL exhibited lower levels of superoxide anion (O2•−) production rate, hydrogen peroxide (H2O2) content, and malondialdehyde (MDA) content compared with DSM, while proline (Pro) content and soluble protein (SP) content were significantly higher than those of DSM. A total of 391 differential metabolites were identified in two samples. Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment showed that the primary differential metabolites were concentrated into the tyrosine metabolism; isoquinoline alkaloid biosynthesis; ubiquinone and other terpenoid quinone biosynthesis; neomycin, kanamycin, and gentamicin biosynthesis; and anthocyanin biosynthesis metabolic pathways.ConclusionCompared with DSM, DRL had more complete anatomical structure, lower active oxygen content, and higher antioxidant level. The results improved our insights into the drought‐resistant mechanisms in sainfoin.

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Expression pattern and physiological roles of Plastid Terminal Oxidase (PTOX) in wild and cultivated barley genotypes under drought stress

Cited by 15 publications

References 54 publications

Here comes the sun: How optimization of photosynthetic light reactions can boost crop yields

Here comes the sun: How optimization of photosynthetic light reactions can boost crop yields

Role of barley stem reserves in the maintenance of grain yield under terminal drought

Integrative leaf anatomy structure, physiology, and metabolome analyses revealed the response to drought stress in sainfoin at the seedling stage

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