Northern inbred lines, such as HuangZao4 and JinHuang44 with strong earliness, 478 and Zheng58 with dwarf staff, can be apt to cross fine temperate-tropical hybrids.

• 北方温带种质自交系黄早四和金黄44具有较强的早熟性，478和郑58具有较强的矮杆性，易于组配优良的温热杂交种，并能在温带改良晚熟、高大的热带、亚热带玉米种质材料；