Blue or far‐red light supplementation induced pre‐hardening in the leaves of the Rht12 wheat dwarfing line: hormonal changes and freezing tolerance

• DOI: 10.1111/ppl.70112
• Publication Date: 2025-03-11T20:50:48Z
• Authors: Zsolt Gulyás; Mohamed Ahres; Tamás Pálmai; Kitti Kulman; Zahra Tahmasebi; Kalpita Singh; Kristóf Jobbágy; Danuše Tarkowská; Petre Dobrev; Radomíra Vanková; Péter Borbély; Andreas Börner; Gábor Galiba
• Keywords: Jasmonic acid; Dwarfing; Gibberellic acid; Dwarfism; Cold hardening

Reduced height (Rht) genes have revolutionised wheat cultivation, but they can compromise freezing tolerance, and only a few alleles are in use. Thus, evaluating the role of other Rht stress responses is crucial. Far-red supplementation white light (W+FR) induce pre-hardening cereals at 15°C. However, relevant effect blue enrichment (W+B) poorly described. This study investigates influence W+FR or W+B exposure young winter leaves tall (wild-type, rht12) dwarf, gibberellin-deficient (near-isogenic line, Rht12) genotype cv. Maris Huntsman background over 10 days The main objectives were to investigate relationship between quality, gibberellin homeostasis, tolerance. Key parameters such as frost injury, hormonal pools expression examined. Results provided evidence about involvement basal tolerance from side availability. It was revealed that treatments partially rescued freezing-sensitive phenotype Rht12 leaves, suggesting potential compensatory mechanism. Analysis gibberellic acid (GA) metabolism indicated differential wild-type with implications for Moreover, alterations hormone levels, including jasmonic (JA) salicylic (SA), observed, highlighting complex interplay signalling regulation wheat. Overall, these findings suggest manipulating may offer strategy enhance dwarf genotypes.