Group 1 - The article highlights the advancements in corn breeding in China, showcasing the development of high-yield and resilient varieties like "Zhongyu 303" to meet increasing market demands [1][2] - The "Zhongyu 303" variety has shown significant improvements, with an increase in yield by 300-400 jin per mu compared to previous varieties, and has been widely adopted, covering 14.75 million mu in the past three years [2] - The article emphasizes the importance of seed innovation in agriculture, noting that corn is a critical crop with unique challenges due to its origins and the need for diverse genetic resources [2][3] Group 2 - The "14th Five-Year Plan" has accelerated the pace of seed industry innovation in China, with policies and technological advancements driving the development of new crop varieties [3][5] - The national agricultural germplasm resource survey initiated by the Ministry of Agriculture and Rural Affairs aims to enhance the understanding and utilization of agricultural resources, leading to the discovery of new varieties [3][4] - The article reports that over 95% of crop varieties in China are now independently bred, with notable achievements in various crops, including wheat, rice, and soybeans, contributing to national food security [6]

立秋刚过，山东乐陵寨头堡乡冢上村，玉米正值授粉期，乐义农作物种植专业合作社负责人闫乐义一大 早就在地里查看玉米长势、密度，了解抽雄授粉出穗等情况。 新华社记者古一平、胡璐 "这个品种耐盐碱、耐干旱，抗病抗倒伏能力强，虫害也不多，看样子今年也能有个好收成。"闫乐义告 诉记者，他从2021年起开始种植玉米新品种"中玉303"，这几年每亩地产量比以往多出三四百斤。 种子是农业的"芯片"。近年来，为更好满足持续增长的市场需求，我国重要农作物玉米涌现出越来越多 高产耐密植、优质宜机收新品种，生动展现了我国种业创新发展的坚实步伐。 国家玉米育种联合攻关秘书长、中国农业科学院作物科学研究所研究员王天宇告诉记者，曾几何时，我 国玉米"过硬"品种不多，加之近年异常气候频发，产量提升不稳定，经常受高温干旱等因素困扰。同时 玉米茎腐病和穗粒腐病等玉米的"癌症"也是厉害的"杀手"，直接影响到玉米产量和质量。 新华社北京8月13日电 题：解锁"芯片"密码 我国种业创新迈出坚实步伐 "努力攻关研究出耐盐碱、抗洪耐旱的玉米品种，解决农业生产实际问题，迫在眉睫。"他说。 与水稻、小麦等不同，玉米起源于美洲，我国玉米种质资源并不丰富，并且种植 ...