中外合作破解大麦种子休眠机制 青藏高原青稞拥有全球最强活性

Core Insights - The research identifies the MKK3 gene as a key factor in regulating the dormancy rhythm of barley seeds across different climatic zones, with Tibetan barley exhibiting the highest MKK3 activity globally [1][4] Group 1: Research Findings - The study reveals that MKK3 operates through a dual mechanism of "copy number + kinase activity" to influence seed dormancy [1] - The research indicates that seed dormancy is a critical trait modified during the domestication of crops, acting as a double-edged sword that can either enhance or reduce yield and quality depending on dormancy duration [3][4] - The team analyzed over 1,000 barley seed samples to understand the spatiotemporal evolution of MKK3, finding that climate and agricultural needs dictate the selection of MKK3 types [4] Group 2: Implications for Agriculture - The findings suggest that the dual regulatory mechanism of MKK3 can be utilized for molecular breeding, allowing for adjustments in seed dormancy through copy number changes or single-base editing [5] - The research provides a potential pathway for developing sustainable agricultural systems to address food security challenges posed by extreme climate changes and population growth [1][5] - The study highlights unique agricultural practices in the Tibetan Plateau, where barley is harvested before full maturity to adapt to extreme climatic conditions, ensuring rapid seed activation post-sowing [4]