【中国新闻网】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 Viewpoint - Chinese scientists, in collaboration with global research institutions, have discovered that a gene named MKK3 regulates the dormancy rhythm of barley seeds across different climate zones, with the highest activity found in Tibetan barley, providing insights for sustainable agricultural systems and food security in the face of climate change [2][3]. Group 1: Research Findings - The study reveals that seed dormancy is a critical trait modified during the domestication of crops, acting as a double-edged sword where short dormancy can lead to premature germination and reduced yield, while long dormancy can affect planting timing and seed uniformity [3][4]. - The MKK3 gene controls seed dormancy traits in barley through dual regulation, where increased gene copy number and stronger kinase activity both contribute to weaker dormancy [4][5]. - The research analyzed over 1,000 barley seed samples globally, finding that climate and agricultural needs influence the selection of MKK3 types, with different regions favoring varying dormancy characteristics [4]. Group 2: Implications for Agriculture - The study highlights unique agricultural practices in the Tibetan Plateau, where barley is harvested before full maturity to adapt to extreme climate conditions, ensuring rapid seed activation post-sowing [4]. - The findings provide actionable molecular modules for breeding resilient crops, allowing for fine-tuning of seed dormancy through gene editing techniques, which is crucial for sustainable agricultural development under global climate change [5].