Phytohormone Cross-Talk Synthesizes Glycoalkaloids in Potato (Solanum tuberosum L.) in Response to Aphid (Myzus persicae Sulzer) Infestation under Drought Stress

Abstract

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.

Revealing Differential Expression of Phytohormones in Sorghum in Response to Aphid Attack Using the Metabolomics Approach

“…ABA negatively affects SA signaling and promotes the JA responsive pathway, thus affecting SA-JA crosstalk [26]. Importantly, cross-talks between these hormonal signal transduction pathways are thought to enable fine-tuning of plant responses to herbivore and pathogen attack [27].…”

Different responses of two maize cultivars to Spodoptera frugiperda (Lepidoptera: Noctuidae) larvae infestation provide insights into their differences in resistance

“…The cross-talk between the ABA signaling pathway and other phytohormones like cytokinin, JA, and SA can alter how plants interact with herbivorous insects (Guo et al, 2016)-for instance, both wheat and rice plants were attacked by hessian fly, which resulted in an increase of SA, 12-oxo-phytodienoic acid, and JA but a decrease of ABA (Zhu et al, 2011). The content of JA, SA, and ABA in potato was significantly increased under aphid stress, suggesting that the cross-talks of phytohormones defend against aphid attack (Quandahor et al, 2020). In pepper plants, after an aphid attack, JA and its metabolite JA-Ile increased significantly, the SA levels remained unaltered until 7 days post-infestation, and the ABA content tended to rise later in the aphid infestation (Florencio-Ortiz et al, 2020).…”

Potato (Solanum tuberosum L.) Leaf Extract Concentration Affects Performance and Oxidative Stress in Green Peach Aphids (Myzus persicae (Sulzer)

“…In a previous study, we discovered that the drought-sensitive Atlantic genotype exhibited greater tolerance to peach aphids under both drought and well-watered conditions [ 23 ]. This cultivar also had high glycoalkaloid content (α-chaconine and α-solanine), which inhibits aphid performance [ 37 ]. As a result, we speculate that the Atlantic cultivar leaf extract will inhibit aphid growth and development.…”