Potato production is adversely affected by aphid infestation across the globe. Understanding the mechanism of host plant defense against aphids under drought stress is paramount for insect pest management. This study was conducted to examine the cross-talk of phytohormones in potato glycoalkaloids’ defense against green peach aphids under greenhouse conditions. A 3 × 2 × 2 factorial experiment comprising three potato cultivars (Qingshu 9, Longshu 3, and Atlantic) and two levels each of water availability and aphid infestation was conducted. The results show that under drought stress, green peach aphids thrive well on host plants, which contain a relatively high water content. The resistant cultivar DXY, which exhibited a higher level of phytohormones, also demonstrated higher α-chaconine and α-solanine contents in both leaf and root, under drought and aphid stress. Conversely, the susceptible cultivar QS9, which exhibited a lower level of phytohormones, also demonstrated low α-chaconine and α-solanine contents in both leaf and root, under drought and aphid stress. The DXY cultivar, which possessed high resistant traits such as α-chaconine and α-solanine, can be used in areas where green peach aphid infestation is a major setback.
Bibliographical noteFunding Information:
This article was fully funded by The National Key Research and Development Program of China (2018YFD0200805) and the National Natural Science Foundation of China (31660522). We show appreciation to JJ Scientific Consultant Ltd., UK, for his valuable contribution to this publication. We are also thankful to Alejandro Calder?n-Urrea of California State University, Fresno, CA, USA for his impact on this article.
Funding: This article was fully funded by The National Key Research and Development Program of China (2018YFD0200805) and the National Natural Science Foundation of China (31660522).
© 2020 by the authors. Licensee MDPI, Basel, Switzerland.
- Hydrogen peroxide
PubMed: MeSH publication types
- Journal Article