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Characterization of Cry2 genes (CRY2a and CRY2b) of B. napus and comparative analysis of BnCRY1 and BnCRY2a in regulating seedling photomorphogenesis

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Abstract

Cryptochrome 2 (CRY2) perceives blue/UV-A light and regulates photomorphogenesis in plants. However, besides Arabidopsis, CRY2 has been functionally characterized only in native species of japonica rice and tomato. In the present study, the BnCRY2a, generating a relatively longer cDNA and harboring an intron in its 5′UTR, has been characterized in detail. Western blot analysis revealed that BnCRY2a is light labile and degraded rapidly by 26S proteasome when seedlings are irradiated with blue light. For functional analysis, BnCRY2a was over-expressed in Brassica juncea, a related species more amenable to transformation. The BnCRY2a over-expression (BnCRY2aOE) transgenics developed short hypocotyl and expanded cotyledons, accumulated more anthocyanin in light-grown seedlings, and displayed early flowering on maturity. Early flowering in BnCRY2aOE transgenics was coupled with the up-regulation of many flowering-related genes such as FT. The present study also highlights the differential light sensitivity of cry1 and cry2 in controlling hypocotyl elongation growth in Brassica. BnCRY2aOE seedlings developed much shorter hypocotyl under the low-intensity of blue light, while BnCRY1OE seedling hypocotyls were shorter under the high-intensity blue light, compared to untransformed seedlings.

Key message

Brassica napus (2n = 38, AACC) is an allotetraploid derived from cross-hybridization of B. rapa (2n = 20, AA) and B. oleracea (2n = 18, CC), followed by chromosome doubling. It is an important oilseed crop, and therefore, efforts are being made to enhance its agronomic traits. Early flowering is one of the essential agronomic traits which the breeders have long targeted in order to shorten the life cycle of Brassica. Early flowering along with delayed maturity, and high leaf area index lead to increase in seed yield. Due to the problem of global warming, high temperature during the terminal stage of a crop can result in significant yield loss as high temperature has a negative effect on bud formation to silique development stage. In this research article, we have reported that overexpression of BnCRY2a in Brassica juncea results in early flowering. This opens the door for making early flowering variety of Brassica napus a reality without any yield penalty. In-depth analysis of the pathway BnCRY2a follows to cause early flowering phenotype will significantly enhance our knowledge on the mechanism of flowering in oilseed crop plants.

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Data availability

The microarray data has been uploaded in Gene Expression Omnibus (GEO) database and its accession number is GSE81459.

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Acknowledgements

This research was funded by the Department of Biotechnology, Government of India (Grant No. BT/AGIII/CARI/01/2012) and the J.C. Bose National Fellowship to JPK by the Science and Engineering Research Board (SERB), Government of India. Authors also acknowledge the infrastructural support provided by the Department of Science and Technology (FIST and PURSE programmes), Government of India, and the University Grants Commission (UGC-SAP), New Delhi. The award of Senior Research Fellowship from the Council of Scientific and Industrial Research, New Delhi, to PS, SM, NB, NB, SS and MC is duly acknowledged. is duly acknowledged. Authors are grateful to Dr. T. Mohapatra (ICAR, New Delhi) for his support from time to time during the course of this investigation.

Funding

This research was funded by the Department of Biotechnology, Government of India (Grant No. BT/AGIII/CARI/01/2012) and the J.C. Bose National Fellowship to JPK by the Science and Engineering Research Board (SERB), Government of India.

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JPK and PS planned and designed the research; PS, SM, NB and MC performed experiments and analyzed the data. PS wrote the manuscript with contributions from SM, NB, MC and SS. AKP provided useful suggestions during the course of study. All authors contributed in writing and editing of the manuscript.

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Correspondence to Paramjit Khurana.

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Sharma, P., Mishra, S., Burman, N. et al. Characterization of Cry2 genes (CRY2a and CRY2b) of B. napus and comparative analysis of BnCRY1 and BnCRY2a in regulating seedling photomorphogenesis. Plant Mol Biol 110, 161–186 (2022). https://doi.org/10.1007/s11103-022-01293-6

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  • DOI: https://doi.org/10.1007/s11103-022-01293-6

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