It is laborious and slow to create a new cultivar with high-multi resistance and high yield and quality through conventional breeding methods from present germ-plasm.
通过常规育种手段从现有资源中选育出多抗、高抗、优质、高产品种难度大，耗时长。
"I'm trying three methods of breeding," Farrant says, "conventional, genetic modification and gene editing."
法兰特说：“我正在尝试三种育种方法，常规方法、基因修饰和基因编辑。”
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。
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