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。
The antigen of Fusarium wilt is seldom. Therefore, using conventional breeding methods to improve resistance of cucumber Fusarium wilt has limitation.
由于黄瓜本身枯萎病抗原材料较少，因此，利用常规育种手段提高黄瓜枯萎病抗病性具有一定的局限性。
The antigen of Fusarium wilt is seldom. Therefore, using conventional breeding methods to improve resistance of cucumber Fusarium wilt has limitation.
由于黄瓜本身枯萎病抗原材料较少，因此，利用常规育种手段提高黄瓜枯萎病抗病性具有一定的局限性。
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