Mechanistic Insights into Cytokinin-Regulated Leaf Senescence in Barley: Genotype-Specific Responses in Physiology and Protein Stability
Ernest Skowron, Magdalena Trojak, Julia Szymkiewicz, Dominika Nawrot
TL;DR
This study explores how cytokinins affect leaf aging in barley, revealing that different barley varieties respond uniquely to these plant hormones.
Contribution
The study identifies a novel stay-green phenotype in the Bursztyn barley cultivar and reveals genotype-specific mechanisms of cytokinin action in delaying leaf senescence.
Findings
Bursztyn barley shows a delayed leaf senescence phenotype with reduced chlorophyll and protein degradation.
Cytokinin application preserves photosynthetic proteins and reduces oxidative stress in barley cultivars.
Endogenous cytokinin contributions to senescence delay vary significantly among barley genotypes.
Abstract
Cytokinins (CKs) are central regulators of leaf senescence, yet their cultivar-specific functions in cereals remain insufficiently understood. Here, we examined dark-induced senescence (DIS) in three barley (Hordeum vulgare L.) cultivars: Carina, Lomerit, and Bursztyn, focusing on responses to exogenous benzyladenine (BA) and inhibition of endogenous CK biosynthesis via the mevalonate (MVA) pathway using lovastatin (LOV). Bursztyn, a winter cultivar, displayed a previously uncharacterized stay-green phenotype, characterized by delayed chlorophyll and protein degradation and reduced sensitivity to BA with respect to chlorophyll retention. In contrast, Carina (spring) senesced rapidly but exhibited strong responsiveness to BA. Lomerit (winter) showed an intermediate phenotype, combining moderate natural resistance to senescence with clear responsiveness to BA. CK application suppressed…
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Taxonomy
TopicsHorticultural and Viticultural Research · Plant Physiology and Cultivation Studies · Plant-Microbe Interactions and Immunity