Goche Tatenda, Ngara Rudo, Chivasa Stephen
Biosciences, Durham University, Durham, England, United Kingdom.
Crop Science, Bindura University of Science Education, Bindura, Zimbabwe.
MicroPubl Biol. 2025 Jan 28;2025. doi: 10.17912/micropub.biology.001284. eCollection 2025.
Phytosulfokine (PSK) signalling promotes drought adaptation in drought-sensitive plants. However, whether naturally drought-tolerant plants deploy PSK signalling in drought is unknown. We are using two sorghum varieties with different drought response phenotypes to investigate tolerance mechanisms. We show that PSK signalling components have high constitutive expression before stress in the drought-tolerant variety. In contrast, gene expression is low in the drought-sensitive variety and is induced after drought exposure. Ability of the drought-tolerant sorghum variety to maintain elevated PSK signalling under optimal water availability suggests that genetic and physiological factors driving drought tolerance may be linked to elevated constitutive PSK signalling.
植物硫肽激素（PSK）信号传导促进干旱敏感型植物的干旱适应性。然而，天然耐旱植物在干旱时是否利用PSK信号传导尚不清楚。我们正在使用两个具有不同干旱反应表型的高粱品种来研究耐受机制。我们发现，在耐旱品种中，PSK信号传导成分在胁迫前具有较高的组成型表达。相比之下，在干旱敏感品种中基因表达较低，且在干旱暴露后被诱导。耐旱高粱品种在最佳水分条件下维持PSK信号传导升高的能力表明，驱动耐旱性的遗传和生理因素可能与组成型PSK信号传导升高有关。
