Desempenho de híbridos de tomate para processamento industrial em pressão de begomovirose e de mancha-bacteriana
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2014-12
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Resumo
Begomoviruses and bacterial spot are examples of important
limiting yield factors for the processing tomato crop in Brazil in which
the availability of resistant cultivars is strongly welcome. Three field
trials were carried out in 2010 and 2011 to evaluate commercial and
experimental processing tomato hybrids under begomovirus (trial 1)
and bacterial spot (trials 2 and 3) pressure. Blocks at random were
used in trials 1 and 2 (2010), while trial 3 (2011) was carried out in a
split-plot randomized blocks design, where Xanthomonas perforans
and/or X. gardneri inoculation (yes or no) was tested in main plots
and hybrids, in sub-plots. Begomovirus infection was natural. Both
diseases were assessed independently by using visual severity rates.
Whenever diseases were assessed in a single evaluation (trials 1 and
2), we estimated the treatment relative effect for disease severity;
while for multiple evaluations (bacterial spot, trial 3), we calculated
the Area Under the Bacterial Spot Progress Curve (AUBSPC). Yield
data were also taken. Significant differences were detected for disease
severity in the three trials and for yield in trials 2 and 3. Hybrids
BRS Sena, HF1-50, and BQ-210 performed better for resistance to
begomoviruses in trial 1. For bacterial spot (trial 2), seven hybrids
had estimated relative effet lower than 0.50, but with intense confident
interval overlapping among hybrids. Yields varied from 33.7 (BQ
145) to 56.5 t/ha (BRS Sena). In trial 3, BRS Sena performed again
among the most resistant to begomovirus, and along with CVR 54,
BA 5446, and HMX 7889 showed an AUBSPC significantly lower
than those of the most susceptible hybrids. In six hybrids the bacterial
spot significantly reduced yield (41.4% in average), which varied
from 95.8 (AP 533) to 138.0 t/ha (BA 5446).
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Solanum lycopersicum, Estatística-teste F, Tomato severe rugose virus, X. gardneri, Xanthomonas perforans, Análise não-paramétrica
Citação
QUEZADO-DUVAL, Alice M. ; NASCIMENTO, Abadia R. ; PONTES, Nadson C.; MOITA, Antonio W.; ASSUNÇÃO, Aracelle; GOLYNSKI, Adelmo; INOUE-NAGATA, Alice K. ; OLIVEIRA, Raísa T.; CASTRO, Yuri O.; MELO, Breno J . Desempenho de híbridos de tomate para processamento industrial em pressão de begomovirose e de mancha-bacteriana. Horticultura Brasileira, Brasília, DF, v. 32, n. 4, p. 446-452, out./dez. 2014.