22 research outputs found
Umidade ponderal em tecidos de pereira durante o perĂodo de dormĂȘncia sob condiçÔes de inverno ameno
Histochemischer Nachweis von StÀrke in thermo-mechanischen Holzstoffen (TMP) aus Splint- und Kernholz der Buche ( Fagus silvatica [L.])
Long- and short-term changes in plant growth following simulated herbivory: adaptive responses to damage?
Coordination of spring vascular and organ phenology in deciduous angiosperms growing in seasonally cold climates
The relationship between xylem differentiation and dormancy evolution in apricot flower buds (Prunus armeniaca L.): the influence of environmental conditions in two Mediterranean areas
Environmental and climatic conditions affect the flower bud growth, flowering and yield performance of fruit species. Temperature and water availability appear to be important factors for temperate fruit trees in mild climates. The aim of this research was to study the involvement of temperature regime on biological processes, such as xylem differentiation and dormancy evolution, in apricot flower buds (Prunus armeniaca L.). Over three consecutive years, biological and anatomical investigations were carried out in Tuscany (Italy) and Murcia (Spain) on two cultivars characterized by a different Chilling Requirement (CR): Currot, a traditional Spanish cultivar with a very low CR, and Stark Early Orange (SEO), a North American cultivar with a very high CR. Currot had a regular bearing, and was characterized by a synchronism between endodormancy release and xylem differentiation. On the other hand, SEO showed an irregular flower bud growth leading to flowering and fruit set failure, even with a high level of chilling accumulation. No relationship was found in SEO between xylem development and flower bud growth reactivation. The de-synchronism between these processes could determine the poor adaptability to different environmental areas of SEO cultivar, and its very high CR is not the main hypothesised cause of the altered flower bud development