玉米是世界各国主要的粮食和饲用作物之一。但玉米籽粒中蛋白质含量和某些氨基酸(特别是赖氨酸)含量低,营养品质差;同时,作为目前广泛采用获得高产的玉米单交种,其自交系产量较低,制种成本高,且生态可塑性不稳定。因此,要获得高产和优质的玉米籽粒,关键在于创造一个产量高和高蛋白质含量的玉米亲本自交系。这是目前世界玉米育种工作者集中注意的问题。 Corn is one of the major food and feed crops in the world. However, the content of corn protein and the content of some amino acids (especially lysine) are low, and the nutritional quality is poor. At the same time, the yield of maize monocotyledonous hybrids which is widely used to produce high yield is low and the cost of seed production is high , And the ecological plasticity is not stable. Therefore, the key to yielding high-yielding and quality maize grains is to create a maize parental inbred line with high yield and high protein content. This is the current focus of the world’s corn breeding workers.