Novos acessos de tomateiro resistentes à mosca-branca biótipo B

Abstract

Resumo -O objetivo deste trabalho foi selecionar novas fontes de resistência a Bemisia tabaci biótipo B, entre 34 acessos de tomateiro (Lycopersicon esculentum), do Banco de Germoplasma de Hortaliças da UFV. Avaliaram-se os números de adultos, ovos e ninfas por planta, além da densidade de tricomas. Detectaram-se diferenças entre os acessos nas variáveis avaliadas. Os acessos BGH-166, BGH-616, BGH-850, BGH-990, BGH-2102 e BGH-2125 apresentaram menor número de adultos, ovos e ninfas por planta e tiveram menor densidade de tricomas. A resistência dos acessos de tomate à mosca-branca foi associada a uma menor densidade de tricomas.Termos para indexação: Bemisia argentifolii, Bemisia tabaci, Lycopersicon esculentum, germoplasma, resistência a pragas, Solanaceae. New accessions of tomato resistant to whitefly biotype BAbstract-The objective of this work was to evaluate resistance to Bemisia tabaci biotype B in 34 tomato (Lycopersicon esculentum) accessions from the Banco de Germoplasma de Hortaliças of UFV. The number of adults, eggs and nymphs per plant besides of trichome density were evaluated. Differences between accessions were found for the evaluated variables. Accessions BGH-166, BGH-616, BGH-850, BGH-990, BGH-2102 and BGH-2125 presented less infestation of adults, eggs and nymphs per plant and showed lower trichome density. The resistance of these tomato accessions to whitefly was associated to a lower trichome density.

The inheritance of late blight resistance derived from Solanum habrochaites

“…The characterization of over than 350 tomato accessions of the BGH (http://www. bgh.ufv.br) resulted in define many resistance sources as well as to Tuta absoluta (Moreira et al 2005, Oliveira et al 2009), potyvirus (Zucchini yellow mosaic virus, ZYMV and Pepper yellow mosaic virus, PepYMV) (Moura et al 2005, Juhász et al 2008, whitefly (Bemisia tabaci biotype B) (Fernandes et al 2009), Phytophthora infestans (Abreu et al 2008) and geminivirus (Tomato yellow spot virus, ToYSV) (Aguilera et al 2008). …”

Variabilidade genética em tomate (Solanum lycopersicon Mill.) por marcadores ISSR

“…The agronomic characterization of over than 350 tomato accessions of the BGH (http://www.bgh.ufv.br) has been accomplished together with the characterization of different resistance to Tuta absoluta (Oliveira et al, 2009;Moreira et al, 2005), potyvirus (Zucchini yellow mosaic virus, ZYMV and Pepper yellow mosaic virus, PepYMV) (Moura et al, 2005;Juhász et al, 2008), whitefly (Bemisia tabaci biotype B) (Fernandes et al, 2009), Phytophthora infestans (Abreu et al, 2008) and geminivirus (Tomato yellow spot virus, ToYSV) (Aguilera et al, 2008). The agronomic characterization and molecular information could provide a great support for breeding programs by including all these data in a joint analysis that takes in account all the variables that enhance the selection process of parents with high divergence.…”

Trichomes and hydrocarbons associated with the tomato plant antixenosis to the leafminer

“…The first leaflet located toward the apex of the leaf base of this leaf in an area of 0.04 cm 2 on the left side without overlaping the region of leaf veins was evaluated. The number counting of trichomes was performed using a stereomicroscope (SMZ-140 Series: Motic) with 40× magnification (Fernandes et al 2009). …”

“…The genetic variability can be obtained by sources of resistance that are present mainly in germplasm banks. Tomato plant subsamples of the horticultural germplasm bank of the Universidade Federal de Viçosa have been tested for the tomato leafminer Tuta absoluta (Lepidoptera: Gelechiidae) (Oliveira et al 2009) and whitefly Bemisia tabaci biotype B (Hemiptera: Aleyrodidae) (Fernandes et al 2009). Although there are studies about pests on tomato plants, there are no studies that identify subsamples of the germplasm bank that are is resistant to L. trifolii.…”