Abstract
The phyllochron is defined as the time required for the appearance of successive leaves on a plant; this characterises plant growth, development and adaptation to the environment. To check the growth and adaptation in cultivars of strawberry grown intercropped with fig trees, it was estimated the phyllochron in these production systems and in the monocrop. The experiment was conducted in greenhouses at the University of Passo Fundo (28º15'41'' S, 52º24'45'' W and 709 m) from June 8th to September 4th, 2009; this comprised the period of transplant until the 2nd flowering. The cultivars Aromas, Camino Real, Albion, Camarosa and Ventana, which seedlings were originated from the Agrícola LLahuen Nursery in Chile, as well as Festival, Camino Real and Earlibrite, originated from the Viansa S.A. Nursery in Argentina, were grown in white polyethylene bags filled with commercial substrate (Tecnomax®) and evaluated. The treatments were arranged in a randomised block design and four replicates were performed. A linear regression was realized between the leaf number (LN) in the main crown and the accumulated thermal time (ATT). The phyllochron (degree-day leaf-1) was estimated as the inverse of the angular coefficient of the linear regression. The data were submitted to ANOVA, and when significance was observed, the means were compared using the Tukey test (p < 0.05). The mean and standard deviation of phyllochrons of strawberry cultivars intercropped with fig trees varied from 149.35ºC day leaf-1 ± 31.29 in the Albion cultivar to 86.34ºC day leaf-1 ± 34.74 in the Ventana cultivar. Significant differences were observed among cultivars produced in a soilless environment with higher values recorded for Albion (199.96ºC day leaf-1 ± 29.7), which required more degree-days to produce a leaf, while cv. Ventana (85.76ºC day leaf-1 ± 11.51) exhibited a lower phyllochron mean value. Based on these results, Albion requires more degree-days to issue a leaf as compared to cv. Ventana. It was conclude that strawberry cultivars can be grown intercropped with fig trees (cv. Roxo de Valinhos).
Highlights
The phyllochron is defined as the time required for the appearance
check the growth and adaptation in cultivars of strawberry grown intercropped with fig trees
it was estimated the phyllochron in these production systems
Summary
ABSTRACT – The phyllochron is defined as the time required for the appearance of successive leaves on a plant; this characterises plant growth, development and adaptation to the environment. The mean and standard deviation of phyllochrons of strawberry cultivars intercropped with fig trees varied from 149.35oC day leaf-1 ± 31.29 in the Albion cultivar to 86.34oC day leaf-1 ± 34.74 in the Ventana cultivar. Ventana (85.76oC day leaf-1 ± 11.51) exhibited a lower phyllochron mean value Based on these results, Albion requires more degree-days to issue a leaf as compared to cv. Entretanto, por ser uma planta de porte baixo, não coincidindo o seu ciclo de cultivo com a figueira, principalmente com as cultivares do grupo de dias curtos, pode tornar-se uma opção para esse sistema de produção. Para a determinação da fenologia, é importante calcular a soma térmica do local, expressa em graus-dia, referindo-se à diferença entre o acúmulo da temperatura média diária e a temperaturabase, acima da qual a planta consegue realizar suas funções fisiológicas (CARVALHO et al, 2005), que, para as cultivares de morangueiro, estima-se em 7oC (RONQUE, 1998; VERDIAL, 2004). O trabalho objetivou verificar o desenvolvimento e a adaptação de cultivares de morangueiro consorciadas com a figueira através do filocrono nesse sistema de cultivo e no cultivo solteiro
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