Unveiling Iso- and Aniso-Hydric Disparities in Grapevine-A Reanalysis by Transcriptome Portrayal Machine Learning.

Area of Science:

• Plant Biology
• Climate Change Adaptation
• Genomics

Background:

• Water stress (WS) significantly impacts grapevine (Vitis vinifera) cultivation, necessitating research into cultivar-specific responses.
• Climate change exacerbates water scarcity, highlighting the need for drought-resilient grapevine varieties.
• Previous transcriptome analyses revealed differences in how isohydric and anisohydric grapevine cultivars manage water scarcity.

Purpose of the Study:

• To elucidate the distinct gene expression trajectories of isohydric and anisohydric grapevine cultivars under water stress.
• To identify key molecular pathways and potential targets for enhancing grapevine drought resilience.
• To understand the dynamic interplay of transcriptional programs during progressive water stress.

Main Methods:

• Reanalysis of existing grapevine transcriptome data.
• Application of self-organizing map (SOM) for transcriptome profiling.
• Functional annotation of differentially expressed genes.

Main Results:

• Isohydric cultivars showed gene expression favoring plant growth and stilbenoid synthesis.
• Anisohydric cultivars exhibited gene expression related to stress response and water management.
• Prolonged water stress led to converging stress responses in both cultivars, notably through chaperone activation.
• Distinct transcriptional programs were identified for managing water scarcity.

Conclusions:

• Cultivar-specific responses to water stress are critical for grapevine adaptation.
• Understanding these differences can inform breeding programs for drought resilience.
• Sustainable viticulture in a changing climate requires tailored strategies based on grapevine water-use strategies.