Host selection by thrips is affected by the floral volatile profile of sunflower.

Autor: Qu, Hui, Chuai, Ze‐Run, Zhang, Wen‐Bing, Zhang, Jian, Yun, Xiao‐Peng, Liu, Jun, Zhao, Jun, Li, Hai‐Ping
Předmět:
Zdroj: Plant, Cell & Environment; Nov2024, Vol. 47 Issue 11, p4354-4368, 15p
Abstrakt: Thrips, Frankliniella intonsa, is a highly polyphagous pest with a worldwide distribution. F. intonsa‐infested sunflower seeds show marked visual damage. The study findings revealed that significantly more F. intonsa infested confection sunflower compared to oilseed sunflower, via olfactometer bioassay studies, we found that compared with the flower and pollen of oilseed sunflowers, those of confection sunflowers attract F. intonsa. Considering this discrepancy in the preference of F. intonsa on oilseed and confection sunflowers, the volatiles of the flower and pollens of two sunflowers were analysed by gas chromatography‐mass spectroscopy. The behavioural responses of F. intonsa were assessed for these compounds using Y‐tube bioassays. Geranyl bromide, a unique volatile component of oilseed sunflowers, induced an assertive approach‐avoidance behaviour in F. intonsa, whereas the unique component ethyl isovalerate in confection sunflowers attracted F. intonsa. F. intonsa adults demonstrated significant attraction to the blends of confection sunflowers. Furthermore, field verification revealed that intercropping confection and oilseed sunflowers could effectively control F. intonsa. The study provided insights into the chemical cues used by F. intonsa in locating hosts. Therefore, oilseed sunflowers can be used as repellent plants to prevent F. intonsa invasion. Summary Statement: The damage to sunflower seeds is caused by Frankliniella intonsa. A previous study found that the seed damage rate of oilseed sunflower varieties was lower than that of confection sunflower varieties. Understanding the underlying reason behind this distinction can help us understand the behaviour of F. intonsa, thereby aiding their control. Our research shows that the attraction of sunflower volatiles to F. intonsa is the root cause of the difference in F. intonsa population. Geranyl bromide, a unique volatile component of oilseed sunflowers, induces an assertive approach‐avoidance behaviour in F. intonsa, whereas the unique component ethyl isovalerate in confection sunflowers attracts F. intonsa. F. intonsa adults demonstrated significant attraction to the blends of confection sunflowers. Furthermore, field verification revealed that intercropping confection and oilseed sunflowers could effectively control F. intonsa. The study provided insights into the chemical cues used by F. intonsa in locating hosts. Therefore, oilseed sunflowers can be used as repellent plants to prevent F. intonsa invasion. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
Externí odkaz: