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Embryo transcriptome and miRNA analyses reveal the regulatory network of seed dormancy in Ginkgo biloba.

Authors
  • Jia, Zhichao1
  • Zhao, Beibei1
  • Liu, Sian1
  • Lu, Zhaogeng1
  • Chang, Bang1
  • Jiang, Huiru1
  • Cui, Hui1
  • He, Qingsong1
  • Li, Weixing1
  • Jin, Biao1
  • Wang, Li1
  • 1 College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, China. , (China)
Type
Published Article
Journal
Tree Physiology
Publisher
Oxford University Press
Publication Date
Apr 08, 2021
Volume
41
Issue
4
Pages
571–588
Identifiers
DOI: 10.1093/treephys/tpaa023
PMID: 32159802
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Seed dormancy is crucial for plant survival and prevents seed germination out of season. However, little is known about the regulatory mechanism of morphophysiological seed dormancy. Ginkgo biloba L. is one of the most ancient gymnosperms, and the completion of seed germination in this species requires cold and moist stratification. Here, we observed that at the mature seed stage, the embryo was not fully developed in G. biloba seeds. During dormancy stages, the length and weight of the embryo significantly increased, and nutrients accumulated in cotyledons. We further found that abscisic acid (ABA), gibberellic acid (GA), cytokinin and ethylene were integrated in the seed dormancy induction, maintenance and release processes, and GA biosynthesis and signaling transduction specifically act on dormancy release. Combining mRNA and miRNA analyses, we demonstrated that miRNA156 is involved in the regulation of morphophysiological dormancy. Our analyses revealed that G. biloba seed dormancy belongs to the ancestral morphophysiological dormancy type, which is not only regulated by the balance of ABA/GA, but also by other hormones associated with embryo morphological development, as well as genes related to embryo differentiation and development. These findings helped with elucidating the comprehensive regulatory network of morphophysiological dormancy in tree seeds. © The Author(s) 2020. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: [email protected]

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