Correlations between Colonization of Onion Thrips and Leaf Reflectance Measures across Six Cabbage Varieties

Autor(es)

Balint, Janos ^{[1, 2]} ; Nagy, Balazs Vince ^{[3, 4]} ; Fail, Jozsef ^[1]

Afiliação do(s) autor(es)

^[1] Corvinus Univ Budapest, Fac Hort Sci, Dept Entomol, Budapest - Hungary

^[2] Sapientia Univ, Fac Tech & Human Sci, Dept Hort, Targu Mures - Romania

^[3] Univ Sao Paulo, Inst Psychol, Sao Paulo - Brazil

^[4] Budapest Univ Technol & Econ, Dept Mechatron Opt & Engn Informat, Budapest - Hungary

• Tipo de documento: Artigo Científico
• Fonte: PLoS One; v. 8, n. 9 SEP 5 2013.
• Citações Web of Science: 4

Resumo

The main purpose of this study was to reveal if the UV-A, and visible light reflection of leaves of white cabbage varieties is correlated to resistance against onion thrips. The antixenotic resistance (AR) against onion thrips and thrips damage differed between varieties Balashi, Bloktor, Riana - considered resistant - and Green Gem, Hurricane, Quisor - considered susceptible. The solar UV-A (340-400 nm) and visible (401-650 nm) light reflection of white cabbage leaves were recorded. Correlation between AR against onion thrips and reflection of leaves in UV-A and visible range of the studied white cabbage varieties were computed. According to the AR evaluation onion thrips density was always higher on susceptible than on resistant varieties. The UV-A light reflection of head forming leaves and the contrast between head and exterior leaves (H/E) was negatively correlated with onion thrips host preference at an early stage of cabbage head formation. The visible light reflection of both head forming and exterior leaves was also negatively correlated with onion thrips host preference. Susceptible varieties had greater damage ratings at harvest than resistant ones and positive correlations were observed between AR and damage. AR against onion thrips may be affected by differences in reflection of cabbage leaves at an early growth stage. It is suggested that more intensive reflection of leaves and/or higher contrast values between the reflectance intensity of head versus outer leaves made the resistant varieties less attractive to onion thrips. Our results reported here provide the first evidence of negative correlation between UV-A and visible reflection of leaves and AR of white cabbage against a dangerous insect pest, opening new perspectives for understanding the role of reflection by plant leaves in pest management. (AU)

• Processo FAPESP: 09/54292-7 - Avaliacao do desempenho visual em diferentes condicoes de iluminacao artificial com caracteristicas espectrais variadas
• Beneficiário: Balazs Vince Nagy
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado