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Elucidating the biochemical basis of

Qiang Li^1,2,3, Wenyun Shen¹, Ioannis Mavraganis¹

¹Aquatic and Crop Research and Development National Research Council Canada Saskatoon SK Canada.

Plant-Environment Interactions (Hoboken, N.J.)

|June 7, 2023

Summary

Cold acclimation reduces trans-∆3-hexadecenoic acid (t16:1) in wheat chloroplasts, linking this change to increased freezing tolerance. This finding offers a new marker for winter hardiness in wheat.

Keywords:

cold acclimation phosphatidylglycerol trans‐16:1 wheat

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Area of Science:

Plant molecular biology
Plant lipid metabolism
Crop physiology

Background:

Phosphatidylglycerol (PG) in chloroplasts typically contains trans-∆3-hexadecenoic acid (t16:1) at the sn-2 position.
Decreased t16:1 content in wheat leaves during cold treatment is observed, but its significance and mechanism are unclear.

Purpose of the Study:

To investigate the association between low-temperature induced t16:1 changes and winter hardiness in wheat.
To elucidate the biochemical mechanisms underlying t16:1 reduction during cold acclimation.

Main Methods:

Field-based assessment of freezing tolerance across diverse wheat cultivars.
Detailed lipidomic analysis of wheat leaf tissues.
Comparative transcriptome sequencing (RNA-seq) under cold acclimation.

Main Results:

A positive correlation was established between reduced t16:1 levels and enhanced freezing tolerance in wheat under field conditions.
Cold acclimation led to decreased activity in chloroplast lipid synthesis pathways, resulting in lower t16:1 in PG.
Transcriptome analysis revealed coordinated shifts in gene expression, indicating a metabolic rebalancing between chloroplast and cytosolic lipid synthesis.

Conclusions:

The reduction of t16:1 in wheat chloroplasts during cold acclimation is mechanistically linked to winter hardiness.
t16:1 serves as a specific metabolite marker for screening freezing tolerance in wheat, representing a valuable "molecular ideotype".