Transgenic tobacco co-expressing flavodoxin and betaine aldehyde dehydrogenase confers cadmium tolerance through boosting antioxidant capacity View Full Text


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Article Info

DATE

2021-10-22

AUTHORS

Mehrdad Shahbazi, Masoud Tohidfar, Sasan Aliniaeifard, Farzaneh Yazdanpanah, Massimo Bosacchi

ABSTRACT

Excessive heavy metal (HM) levels in soil have become a source of concern due to their adverse effects on human health and the agriculture industry. Soil contamination by HMs leads to an accumulation of reactive oxygen species (ROSs) within the plant cell and disruption of photosynthesis-related proteins. The response of tobacco lines overexpressing flavodoxin (Fld) and betaine aldehyde dehydrogenase (BADH) to cadmium (Cd) toxicity was investigated in this study. PCR results demonstrated the expected amplicon length of each gene in the transgenic lines. Absolute qRT-PCR demonstrates a single copy of T-DNA integration into each transgenic line. Relative qRT-PCR confirmed overexpression of Fld and BADH in transgenic lines. The maximum quantum yield of photosystem II (Fv/Fm) was measured under Cd toxicity stress and revealed that transgenic lines had a higher Fv/Fm than wild-type (WT) plants. Accumulation of proline, glycine betaine (GB), and higher activity of antioxidant enzymes alongside lower levels of malondialdehyde (MDA) and hydrogen peroxide (H2O2) was indicative of a robust antioxidant system in transgenic plants. Therefore, performing a loop in reducing the ROS produced in the photosynthesis electron transport chain and stimulating the ROS scavenger enzyme activity improved the plant tolerance to Cd stress. More... »

PAGES

965-979

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  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s00709-021-01714-1

    DOI

    http://dx.doi.org/10.1007/s00709-021-01714-1

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1142067364

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/34686944


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