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Increased Rubisco content in maize mitigates chilling stress and speeds recovery by Coralie E. Salesse‐Smith; Robert E. Sharwood; Florian A. Busch; David B. Stern is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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## Summary Many C~4~ plants, including maize, perform poorly under chilling conditions. This phenomenon has been linked in part to decreased Rubisco abundance at lower temperatures. An exception to this is chilling‐tolerant __Miscanthus,__ which is able to maintain Rubisco protein content under such conditions. The goal of this study was to investigate whether increasing Rubisco content in maize could improve performance during or following chilling stress. Here, we demonstrate that transgenic lines overexpressing Rubisco large and small subunits and the Rubisco assembly factor RAF1 (RAF1‐LSSS), which have increased Rubisco content and growth under control conditions, maintain increased Rubisco content and growth during chilling stress. RAF1‐LSSS plants exhibited 12% higher CO~2~ assimilation relative to nontransgenic controls under control growth conditions, and a 17% differential after 2 weeks of chilling stress, although assimilation rates of all genotypes were ~50% lower in chilling conditions. Chlorophyll fluorescence measurements showed RAF1‐LSSS and WT plants had similar rates of photochemical quenching during chilling, suggesting Rubisco may not be the primary limiting fact

Who reads Increased Rubisco content in maize mitigates chilling stress and speeds recovery?

Author

Coralie E. Salesse‐Smith; Robert E. Sharwood; Florian A. Busch; David B. Stern

Published

2019

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)