%0 Journal Article
%T Role of allelochemicals and trichome density in the resistance of tomato to whitefly Papel de aleloqu¨ªmicos e densidade de tricomas na resist¨ºncia de tomateiro ¨¤ mosca-branca
%A Ir£¿ Pinheiro Neiva
%A Valter Carvalho de Andrade J¨²nior
%A Wilson Roberto Maluf
%A Celso Mattes Oliveira
%J Ci¨ºncia e Agrotecnologia
%D 2013
%I Universidade Federal de Lavras
%X In Brazil, the tomato is cultivated in almost all geographic regions even though its yield is significantly reduced by pests and diseases. Among these pests and diseases, whitefly is a major problem that causes direct and indirect damage due to its role in transmission of geminiviruses. The aim of the present study was to compare the degree of resistance to the silverleaf whitefly of tomato plant lines rich in acyl sugars (AS), zingiberene (ZGB), and 2-tridecanone (2-TD) and to establish whether selection for strains with higher densities of glandular trichomes promotes sufficient resistance to this insect pest. The investigated lines were developed by performing back-crossings in tomato (Solanum lycopersicum) from the interspecific crossing of S. lycopersicum x S. habrochaites var. glabratum 'PI 134417'. Lines rich in AS, ZGB, and 2-TD were tested for their levels of resistance to B. tabaci biotype B. Two tomato plant lines (TOM-584 and TOM-679) with normal AS levels and one wild specimen (PI 134417) with high 2-TD content were used as controls. TOM-687, ZGB-703, and TOM-622 were less preferred by B. tabaci for oviposition, and nymphs exhibited a poorer survival rate on those plant lines than on the susceptible controls, TOM-584 and TOM-679. Allelochemical-rich lines exhibited pest resistance, whereas the controls did not, and the allelochemical-rich lines did not differ significantly from each other in the level of resistance. The results show that the development of tomato plant lines rich in 2-TD, ZGB and AS is an effective option for indirect selection for resistance to B. tabaci biotype B. All lines selected based on high trichome density except for BPX-365F-751-05-01-03 exhibited fewer nymphs than the susceptible controls, indicating that selection for more glandular trichomes was generally effective in promoting increased resistance to the silverleaf white flay. No Brasil, o tomate ¨¦ cultivado em praticamente todas as regi es, embora seu rendimento seja reduzido por pragas e doen as. A mosca-branca, comumente presente, causa danos diretos e indiretos, devido ¨¤ transmiss o de geminiviros. O objetivo do presente trabalho foi comparar o grau de resist¨ºncia ¨¤ mosca branca de linhagens de tomateiro ricas em acila ¨²cares (AA), zingibereno (ZGB) e 2-tridecanona (2-TD) e verificar se a sele  o de linhagens com base em tricomas glandulares ¨¦ efetiva no sentido de promover n¨ªveis satisfat¨®rios de resist¨ºncia. Essas linhagens foram obtidas atrav¨¦s de retrocruzamentos em tomateiro Solanum lycopersicum, a partir do cruzamento interespec¨ªfico S. lycopersicum x
%K Solanum lycopersicum
%K 2-tridecanona
%K zingibereno
%K acila ¨²car
%K sele  o indireta
%K Solanum lycopersicum
%K 2-tridecanone
%K zingiberene
%K acyl sugars
%K indirect selection
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542013000100007