<b>Phenology and leaf accumulation in vernalized and non-vernalized strawberry seedlings in neutral-days</b> - doi: 10.4025/actasciagron.v36i1.17285

Abstract

ABSTRACT. Phenology and phyllochron are parameters that help in characterizing vegetal growth and development. This study is an evaluation of the performance of the vernalized and non-vernalized Albion strawberry cultivar in relation to phenology and phyllochron in substrate. The experiments were developed in the greenhouse of the Horticulture Sector of the Universidade de Passo Fundo, Rio Grande do Sul State. The plants were placed in bags spread over wooden benches and filled with substrate formed by carbonized rice hulls and Mec Plant Horta 2 ® . The experimental design used for both experiments was randomized blocks with 4 repetitions and 8 plants per parcel. In each parcel, 4 plants were randomly marked and evaluated for phenology and phyllochron. For phenology, the dates of onset of flowering and fruiting and the beginning and the end of the harvest were registered. For phyllochron, a weekly count of the number of leaves was performed. A linear regression of the number of leaves (NL) in the main corona and the accumulated thermal time (Att) was performed. Vernalization predicts the cycle of the Albion cultivar, the leaf appearance rate and the phyllochron when compared to those without vernalization.Keywords: Fragaria x ananassa Duch., phenologic stages, thermal time. Fenologia e acúmulo de folhas em mudas vernalizadas e não vernalizadas em morangueiro de dias neutros RESUMO.A fenologia e o filocrono são parâmetros que auxiliam na caracterização do crescimento e desenvolvimento vegetal. O objetivo do trabalho foi avaliar o desempenho da cultivar de morangueiro Albion com e sem vernalização quanto à fenologia e ao filocrono, em substrato. Os experimentos foram desenvolvidos em estufa agrícola no Setor de Horticultura da Universidade de Passo Fundo, Estado do Rio Grande do Sul. As plantas foram dispostas em sacolas distribuídas sobre bancadas de madeira, preenchidas com substrato formado por casca de arroz carbonizada e Mec Plant Horta 2 ® . O delineamento experimental utilizado para os dois experimentos foi de blocos casualizados, com quatro repetições e oito plantas por parcela. Em cada parcela foram marcadas ao acaso quatro plantas, nas quais foi realizada as avaliações de fenologia e filocrono. Para fenologia registrou-se datas do início do florescimento e da frutificação, início e final de colheita. Para filocrono semanalmente realizou-se a contagem do número de folhas. Foi realizada regressão linear entre o número de folhas (NF) na coroa principal e a soma térmica acumulada (STa). A vernalização antecipa o ciclo da cultivar de morangueiro Albion, a taxa de aparecimento de folhas e o filocrono quando se compara com as sem vernalização.Palavras-chave: Fragaria x ananassa Duch., estádios fenológicos, soma térmica.

Postharvest quality of strawberry (Fragaria × ananassa (Duchesne ex Weston) Duchesne ex Rozier) genotypes according to vernalization

“…According to Costa, Calvete, Mendonça & de Costa (2014), mention that greater productivity in its cultivation is related to the number of cold hours that strawberry plants receive.…”

Estimated phyllochron in low tunnel cultivated strawberry cultivars

“…According to the results, it is possible to observe the importance of cold hours that neutral day seedlings received during nursery stage, since 'Albion' seedlings from Chile presented lower phyllochron values when compared to seedlings from Pelotas, which presented higher leaf emission ratio. In this sense, at vernalization is a factor that affects strawberry development, which is in accordance COSTA et al (2014), and can confer anticipation of the culture cycle, and RONQUE (1998) related the crop yield with the number of cold hours received by seedlings at the nursery.…”

Artificial vernalization in strawberry plants: phyllochron, production and quality

“…A strategy to increase the floral differentiation and increase fruit production may be seen in the artificial vernalization of seedlings. This practice provides artificial conditions of temperature, with an aim to stimulate the differentiation of flower (Costa et al, 2014). In addition, imported strawberry seedlings are expensive and result in higher total costs of crop production when compared to the national seedlings.…”