An early light-inducible protein (GbELIP) isolated from immature ginkgo leaves by rapid amplification of cDNA ends method contains a 570 bp open reading frame encoding a 189 amino acid protein, with significant homology to early light-inducible proteins from other plant species. The genomic DNA of GbELIP gene contains three exons and two introns. Southern blotting revealed that GbELIP is a single-copy gene in ginkgo. Light, defense and stress responsive element were found in the promoter region of GbELIP. GbELIP expressional patterns were detected by Real-time PCR at various conditions. ELIP expressions were variable at different time points of 1 day and increasing significantly at the commencement of light illumination then dropping to a basal level gradually. ELIP expression in small size leaves (1–1.5 cm width and 7-day age) was higher then middle (2–3 cm width and 15-day age) and large (4 cm width and 30-day age) size leaves. It revealed that ELIP expression was under the control of developmental regulation. Under temperature and light intensity treatments, GbELIP transcripts accumulation may relate to photoinhibition. The peak expression of GbELIP appeared later by chilling than heating. Meanwhile, GbELIP expression under high light was higher than low light at both two temperatures. GbELIP expression was also increased by wounding and methyl jasmonate (Me-JA) treatment, but not corresponded with increasing malondialdehyde (MDA) concentration. In conclusion, GbELIP appears to be induced by an imbalance between chlorophyll formation and degradation during development or under abiotic stress. These results suggest that GbELIP may function in response to environmental signals, possibly regulating responses to abiotic stresses.
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This research was supported by the foundation of excellent doctoral dissertation in Nanjing Forestry University, the plan of scientific research innovation of graduate students in general college (CXZZ12_0546), national nature science foundation (31170627) and nature science foundation of Jiangsu province (BK2010019). We thank Tongli Wang, a research associate in the University of British Columbia’s Department of Forest and Conservation Science, for giving us so many suggestions on structure arrangement of this paper. Thanks for Robin Mellway, a post-doctor fellow with the University of British Columbia’s Department of Forest and Conservation Sciences, on editing of wording and grammar in the paper.
Communicated by S. Abe.
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Wang, H., Cao, F., Li, G. et al. The transcript profiles of a putative early light-induced protein (ELIP) encoding gene in Ginkgo biloba L. under various stress conditions. Acta Physiol Plant 37, 1720 (2015). https://doi.org/10.1007/s11738-014-1720-8