Articles

Identification and expression analyses of the CENTRORADIALIS (CEN) gene family involved in flowering regulation in persimmon (Diospyros kaki)

Article number
1404_87
Pages
639 – 644
Language
English
Abstract
Persimmon (Diospyros kaki Thunb.) has been grown for centuries as one of the most important fruit trees in eastern Asia.
As with other fruit tree species, persimmon has a relatively long juvenile period of 3 to 4 years, which hinders effective breeding.
Furthermore, the long juvenile period is also an obstacle to gene functional analysis for reproduction traits.
Although overexpression of FLOWERING LOCUS T (FT) promotes precocious flowering of various fruit tree species, FT overexpression was unable to promote persimmon flowering in previous studies.
In this study, we tested if suppression of CENTRORADIALIS-like (CEN-like), a flowering suppressor, could induce precocious flowering in persimmon.
We conducted phylogenetic analysis to identify CEN orthologs and found two DkCEN1 and DkCEN2 as candidate genes for the flowering suppressor in persimmon.
CRISPR-Cas9 and RNA interference (RNAi) were utilized to knock out and knock down CEN-likes, respectively.
Two kinds of gRNA targeting DkCEN1 and DkCEN2 were designed for CRISPR-Cas9-mediated gene editing.
Green fluorescent protein (GFP) gene was also incorporated into CRISPR-Cas9 vector to monitor transgene expression.
For RNAi, we designed three different amiRNAs, which targets DkCEN1, DkCEN2, and both DkCEN1 and DkCEN2, respectively and placed them together on the T-DNA region of a binary plasmid.
After confirming the efficacy of binary vectors in tobacco (Nicotiana tabacum) transformation, persimmon is now being transformed.
We also tested the use of a synthetic cytokinin 4PU30 in place of usually used natural cytokinin zeatin to improve regeneration efficiency of persimmon.
The results obtained in this study will lead to better understanding of genome-editing and flowering in persimmon.

Publication
Authors
C. Iwami, M. Omori, T.-F. Hsiang, S.S. Sugano, T. Akagi, R. Tao
Keywords
YMA, Agrobacterium, artificial miRNA, gene editing, RNAi, transformation
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