Buds of "Italia melhorada" grapevines grown under tropical conditions develop a quiescent state
Author
dc.contributor.author
Dantas, Debora
Author
dc.contributor.author
Bressan Smith, Ricardo
Author
dc.contributor.author
Noriega, Ximena
Author
dc.contributor.author
Pérez, Francisco
Admission date
dc.date.accessioned
2020-05-13T23:00:25Z
Available date
dc.date.available
2020-05-13T23:00:25Z
Publication date
dc.date.issued
2020
Cita de ítem
dc.identifier.citation
Environmental and Experimental Botany 171 (2020) 103951
es_ES
Identifier
dc.identifier.other
10.1016/j.envexpbot.2019.103951
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/174713
Abstract
dc.description.abstract
A double cropping system for the grapevine (Vitis vinifera L) has been commercially adopted for use in regions where the tropical climate is characterized by high temperatures and small variations in daylength throughout the year. Under these climatic conditions, the use of hydrogen cyanamide (HC), a compound that breaks bud dormancy, is mandatory to produce homogeneous budbreak. However, it is unknown whether grapevine buds are capable of developing endodormancy (ED) under these climatic conditions. In this study, typical signals of ED, such as the number of nodes per cane, the development of periderm and the thickening of the cell wall of the bud meristematic cells, were analysed in vines of "Italia melhorada" grown in Mossord, Brazil (5 degrees 12'16 '' S), under a natural (ND) photoperiod (12/12 h), a short-day (SD) photoperiod (10/14 h) and a long-day (LD) photoperiod (14/10 h). The abundance of phytochrome A (VvPHYA) and B (VvPHYB) and FLOWERING LOCUS T (VvFT) transcripts in the leaves and buds was also determined. The results showed a reduced number of nodes per cane and development of the periderm in the shoots of grapevines grown under ND and SD photoperiods. In addition, compared with that under the LD photoperiod, the expression of VvPHYA and VvFT under the ND and SD-photoperiod decreased, and the expression of VvPHYB increased. However, the thickness of the cell wall of the bud meristematic cells increased only in the grapevines exposed to the SD photoperiod. Therefore, we hypothesize that cell wall thickening is a characteristic of ED, while decreased expression of VvPHYA and VvFT and increased expression of VvPHYB are characteristic of quiescence. Consequently, under a tropical conditions, the grapevine buds would be in a quiescent state and not in a dormant state.
es_ES
Patrocinador
dc.description.sponsorship
Fondo Nacional de Ciencia y Tecnologia (FONDECYT), Chile Proyecto
1190057