AI Article Synopsis
- Recent research highlights the role of the plant hormone abscisic acid (ABA) in regulating endodormancy (ED) in grapevine buds, showing higher ABA levels in latent buds compared to shoot apices.
- A negative correlation was found between ABA content and expression levels of cell cycle genes (CCG), suggesting ABA inhibits CCG expression in grapevine meristematic tissues.
- The study also revealed that the dormancy-breaking compound hydrogen cyanamide (HC) can reduce ABA levels and increase CCG expression, indicating ABA's key role in controlling grapevine bud development during ED.
Article Abstract
Recently, the plant hormone abscisic acid (ABA) has been implicated as a key player in the regulation of endodormancy (ED) in grapevine buds ( L). In this study, we show that in the vine, the expression of genes related to the biosynthesis of ABA () and the content of ABA are significantly higher in the latent bud than at the shoot apex, while the expression of an ABA catabolic gene () showed no significant difference between either organ. A negative correlation between the content of ABA and transcript levels of cell cycle genes (CCG) was found in both tissues. This result suggested that ABA may negatively regulate the expression of CCG in meristematic tissues of grapevines. To test this proposition, the effect of ABA on the expression of CCG was analyzed in two meristematic tissues of the vine: somatic embryos and shoot apexes. The results indicated that cell cycle progression is repressed by ABA in both organs, since it down-regulated the expression of genes encoding cyclin-dependent kinases () and genes encoding cyclins of type A (), B (), and D () and up-regulated the expression of , a gene encoding an inhibitor of CDKs. During ED, the content of ABA increased, and the expression of CCG decreased. Moreover, the dormancy-breaking compound hydrogen cyanamide (HC) reduced the content of ABA and up-regulated the expression of CCG, this last effect was abolished when HC and ABA were co-applied. Taken together, these results suggest that ABA-mediated repression of CCG transcription may be part of the mechanism through which ABA modulates the development of ED in grapevine buds.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5437152 | PMC |
| http://dx.doi.org/10.3389/fpls.2017.00812 | DOI Listing |
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