通过以上各种条件的优化，本文建立了一套较为高效的玉米优良自交系R18转化及再生系统。
Using all the methods mentioned above, an efficient and stable transformation system of embryogenic calli of elite inbred line R18 was established.
结果表明，在这一优势群的优良自交系中，多数数量性状遗传变异较大，具有进一步改良提高的潜力。
There was large genetic variance for most traits investigated in the lines from the exotic heterosis population.
利用丹340改良了黄早四类群玉米自交系吉853，育成配合力高、抗丝黑穗病的优良自交系津01和津02。
Maize inbred line Ji853 from Huangzaosi groups was improved by Dan340, and selected excellent line cultivars Jin01 and Jin02 that with high combining ability and head smut-resistance.
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