Abstract
Key message
A number of potential genes and pathways involved in tepal trichome development were identified in a natural lily mutant by transcriptome analysis and were confirmed with trichome and trichomeless species.
Abstract
Trichome is a specialized structure found on the surface of the plant with an important function in survival against abiotic and biotic stress. It is also an important economic trait in crop breeding. Extensive research has investigated the foliar trichome in model plants (Arabidopsis and tomato). However, the developmental mechanism of tepal trichome remains elusive. Lilium pumilum is an edible ornamental bulb and a good breeding parent possessing cold and salt-alkali resistance. Here, we found a natural mutant of Lilium pumilum grown on a highland whose tepals are covered by trichomes. Our data indicate that trichomes of the mutant are multicellular and branchless. Notably, stomata are also developed on the tepal of the mutant as well, suggesting there may be a correlation between trichome and stomata regulation. Furthermore, we isolated 27 differentially expressed genes (DEGs) by comparing the transcriptome profiling between the natural mutant and the wild type. These 27 genes belong to 4 groups: epidermal cell cycle and division, trichome morphogenesis, stress response, and transcription factors. Quantitative real-time PCR in Lilium pumilum (natural mutant and the wild type) and other lily species (Lilium leichtlinii var. maximowiczii/trichome; Lilium davidii var. willmottiae/, trichomeless) confirmed the validation of RNA-seq data and identified several trichome-related genes.
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Acknowledgements
This work was funded by Beijing Natural Science Foundation (Grants 6212012 to JW), National Natural Science Foundation projects (Grants 31601781 to YPD; 31701952 to JW), The special projects for capacity-building in scientific and technological innovation of Beijing Academy of Agriculture and Forestry (KJCX20200103), The Youth Fund Project of Beijing Academy of Agriculture and Forestry (QNJJ201910), Construction of Beijing Science and Technology Innovation and Service Capacity in Top Subjects (CEFF-PXM2019_014207_000032) and 111 Project of the Ministry of Education (B17043). We thank Dr. Sonia Gazzarrini (University of Toronto) for suggestions for this work.
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YX, WP, and CX performed the most experiments and analysis in this study; MZ, XC, FY, and JL assisted with the data analysis and plant materials; JW, YD, and XZ conceived the study; JW, WP, and YX wrote the article; all authors read and approved the article.
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Xin, Y., Pan, W., Chen, X. et al. Transcriptome profiling reveals key genes in regulation of the tepal trichome development in Lilium pumilum D.C.. Plant Cell Rep 40, 1889–1906 (2021). https://doi.org/10.1007/s00299-021-02753-x
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DOI: https://doi.org/10.1007/s00299-021-02753-x