Abstract
Heavy metals, including a hexavalent form of chromium (Cr(VI)) increasing accumulation in agricultural soil, cause a significant reduction in quality, yield, and growth of rice varieties worldwide. Screening for the selection of tolerant varieties is essential for conventional and molecular breeding. Shaheen basmati (SB) and basmati-385 (B-385) rice varieties, a subspecies of indica, show different sensitivity to Cr(VI), but the underlying mechanisms of this different sensitivity remain elusive. In the current study, we examine the sensitivity of SB and B-385 based on the root, which is the primary organ that encounters water and soil containing Cr(VI), elongation assay, and ethylene’s possible role (a stress-responsive phytohormone) in the process. Our results show that SB’s seedlings exhibit hypersensitivity as a higher root elongation inhibition than B-385 under different Cr(VI) concentrations. Hypersensitive SB consistently expresses a higher level of ethylene biosynthesis and signaling-related genes than B-385. Moreover, ethylene signaling antagonist (silver, Ag) and biosynthesis inhibitor (aminoethoxy vinyl glycine, AVG) alleviate the difference in Cr(VI)-induced root growth inhibition between SB and B-385, respectively. Taken together, we conclude that ethylene mediates difference in sensitivity based on the difference in root growth inhibition in different rice varieties.
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The research was supported by Major State Basic Research Development Program the National Key R & D Program of China (2016YFD0100701), the Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang (2019R01002) and Zhejiang Provincial Natural Science Foundation of China (LQ19C130004) and the National Natural Science Foundation of China (Grant No. 31570183; 31529001; 31661143004).
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1. Abdul Wakeel: conception or design of the work, experimental work, data collection, data analysis and interpretation, and drafting the article
2. Imran Ali: experimental work and critical revision of the article
3. Minjie Wu: experimental work
4. Bohan Liu: experimental work
5. Yinbo Gan: final approval of the version to be published
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Wakeel, A., Ali, I., Wu, M. et al. Dichromate-induced ethylene biosynthesis, perception, and signaling regulate the variance in root growth inhibition among Shaheen basmati and basmati-385 rice varieties. Environ Sci Pollut Res 28, 38016–38025 (2021). https://doi.org/10.1007/s11356-021-13477-6
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DOI: https://doi.org/10.1007/s11356-021-13477-6