青贮玉米是现代畜牧业中的主要粗饲料来源，培育专用型青贮玉米品种是促进畜牧业高质量发展的重要举措。针对甘肃省青贮玉米品种匮乏、适应性差等问题，甘肃省农业科学院作物研究所玉米育种团队以高生物产量、高品质和高抗性为目标，利用改良Reid×美杂(含热带血缘)为杂种优势利用模式，成功组配出以自育自交系M30-1为母本，外引系87-1为父本的专用型青贮玉米杂交种陇青3号。2020 — 2021年参加甘肃省青贮玉米区域试验A组试验，陇青3号2 a平均折合产量32 531.1 kg/hm2，较对照品种豫玉22号增产8.6%。2021年参加甘肃省青贮玉米品种生产试验，平均折合产量为31 920.0 kg/hm2，较对照品种豫玉22号增产9.0%，表现出良好的丰产稳产性。该品种籽粒含粗蛋白76 g/kg、粗淀粉334 g/kg、中性洗涤纤维345 g/kg、酸性洗涤纤维182 g/kg。高抗禾谷镰孢茎腐病，感大斑病，感丝黑穗病，抗倒性好，持绿性70.2%。适宜在甘肃省河西、中部及陇东地区推广种植。

Silage maize is a critical roughage source in modern animal husbandry, and the development of specialized silage corn varieties constitutes a key strategy for advancing the high-quality development of the livestock industry. To tackle challenges such as the lack of specialized silage corn varieties and poor adaptability in Gansu Province, the Corn Breeding Team at the Crop Research Institute of Gansu Academy of Agricultural Sciences, aiming to develop a variety with high biomass yield, superior quality, and strong resistance, has successfully developed the specialized silage corn hybrid 'Longqing 3' by employing an enhanced Reid × American hybrid(with tropical germplasm) heterosis utilization model, the team crossed the self-bred inbred line M30-1 (female parent) with the introduced line 87-1 (male parent). In the 2020 to 2021 Gansu provincial silage maize regional experiments (Group A), Longqing 3 achieved an average equivalent yield of 32 531.1 kg/ha over two years, representing an 8.6% increase over the control variety Yuyu 22. In the 2021 provincial production experiment, its average equivalent yield reached 31 920.0 kg/ha, 9.0% higher than Yuyu 22, demonstrating high and stable yield performance. The kernels contained 76 g/kg crude protein, 334 g/kg crude starch, 345 g/kg neutral detergent fiber, and 182 g/kg acid detergent fiber. The variety showed high resistance to Fusarium graminearum stalk rot, susceptibility to northern leaf blight and head smut, good lodging resistance, and 70.2% stay-green rate. It is suitable for cultivation in the Hexi Corridor, central, and eastern regions of Gansu Province.

S513

国家自然科学基金(32360511、32460510)。