In the past decades, considerable progress has been made in maize breeding for drought tolerance using conventional methods, but with low breeding efficiency due to various causes.
多年来，通过常规手段进行玉米抗旱育种取得了一定进展，但由于多方面原因，其育种效率没有得到进一步提高。
High lysine maize breeding in China had its start in 1973, and was suspended at the end of 1995. It made considerable progress over the past 20 years, but it failed eventually.
我国高赖氨酸玉米育种起始于1973年，终止于1995年底，历经20多年，并取得了一定成效，但最终归于失败。
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