Barley transcriptome analyses upon interaction with different aphid species identify thionins contributing to...

Area of Science:

• Plant-insect interactions
• Molecular plant pathology
• Crop science

Background:

• Aphids cause significant yield losses in crops like barley.
• Aphid host range is influenced by molecular interactions during probing.
• Understanding plant responses to different aphid species is crucial for crop protection.

Purpose of the Study:

• To investigate barley's transcriptional responses to aphid species with varying infestation capabilities.
• To identify molecular mechanisms underlying host-plant interactions with aphids.
• To assess the role of specific plant defense genes in aphid resistance.

Main Methods:

• Assessed colonization, settlement, and probing behavior of Rhopalosiphum padi, Myzus persicae, and Myzus cerasi on barley.
• Analyzed differential gene expression in barley upon aphid interaction using transcriptomic analysis.
• Performed ectopic expression of identified defense genes in Nicotiana benthamiana to validate function.

Main Results:

• Myzus persicae (poor-host) induced the strongest transcriptional changes in barley.
• Thionin genes were significantly upregulated in response to M. persicae and R. padi.
• Ectopic expression of thionins in N. benthamiana conferred reduced susceptibility to M. persicae.

Conclusions:

• Barley exhibits distinct transcriptional responses to different aphid species.
• Thionins play a role in barley's defense against aphid attack, particularly from M. persicae.
• Molecular interactions during aphid probing influence plant defense activation and host range.