Exigência Térmica De Duas Seleções E Quatro Cultivares De Morangueiro Cultivado No Planalto Catarinense

Abstract

HEAT REQUIREMENT OF TWO SELECTIONS AND FOUR STRAWBERRY CULTIVARS GROWN IN THE CATARINENSE PLATEAUABSTRACT -the objective of this study was to estimate the thermal accumulation and phyllochron of four cultivars and two selections of strawberry in the Southern Brazil. the research was carried out in the experimental field at the Centro de Ciências Agroveterinárias, in the University of Santa Catarina, Lages, SC. It was used two advanced knowledge selection of strawberry, called 'Sel1' and 'Sel2', with plants from a public breeding program in Italy and four cultivars: Camino Real and Camarosa, with plants from Chile; San andreas and albion from argentina. the transplant occurred in 06-26-2012. the experimental design was randomized blocks with three repetitions, where the experimental unit was composed of eight plants, using the four central plants. The phyllochron was estimated as the inverse of the angular coefficient of the linear regression between the number of stem leaf and the thermal time after transplantation. It was observed linearity between plant development and the average air temperature in the conditions of the study. among the selections and cultivars studied the San Andreas features the earliest cycle requiring less accumulation temperature (774.70 degree-day) and the cultivar camarosa the latest cycle with greater accumulation of thermal sum (1137.75 degree-day). The selection SEL1 had the shortest phyllochron, 69.96 o c day 1 leaf -1 and the cultivar albion higher value, 135.61 o c day 1 leaf -1 . During the study period the cultivar San andreas showed higher fruit production.

Artificial vernalization in strawberry plants: phyllochron, production and quality

“…In other studies, the Albion cultivar also had a lower rate of leaf emission when compared to other cultivars, as observed by Mendonça et al, (2012), in a study in which this cultivar required higher accumulation of degree days to emit a leaf. Tazzo et al, (2015) found phyllochron values of 135.61° C day leaf -1 for the Albion cultivar, which is higher than what was seen for Camarosa. For the Albion cultivar, Costa et al, (2012) observed differences in phyllochron of vernalized and non-vernalized seedlings and the appearance of leaves on vernalized seedlings was 93.30° C day leaf -1 , while for nonvernalized seedlings, the phyllochron was 117.80° C day leaf -1 .…”

“…For the Camarosa cultivar, which showed lower phyllochron, a greater amount of leaves (16 leaves) was observed as compared to Albion (10 leaves), from this morphological characteristic it can be inferred that Camarosa has a greater leaf area, unlike Albion which demonstrated a lesser rate for the transformation of photosynthetic energy and consequently a lesser accumulation of reserves (Tazzo et al, 2015), factors which can influence crop yields.…”

Genetic divergence of strawberry cultivars under different managements

“…is a herbaceous and creeping plant, which although has characteristics of perennial crop, it is cultivated as annual (CALVETE et al, 2008). Its fruit has great economic importance, being the most popular, cultivated and consumed in the small fruit group (TAZZO et al, 2015). In Brazil, the crop is widespread in temperate and subtropical regions, where strawberries are produced for in natura consumption and also for industrialization (RADMANN et al, 2006).…”

Vegetative Stage of Strawberry Duration Determined by the Crop Year

“…These changes can be related to the development of the seedling that needs some hours of cold to accumulate carbon in its crown and to change stage (TAZZO et al, 2015).…”