通常，怪圈季是以一个漂亮的小图案开场，比如三瓣花之类的。运气好的话，油菜田里会出现一两个怪圈。
Usually, the season starts with a nice little pattern, a tri-petal flower or such like, one or maybe two in rape if we are lucky.
近20年，油菜小孢子培养已得到深入的研究，并建立了完善的油菜小孢子再生体系。
In recent 20 years with more studies of rapeseed microspore culture a perfect regenerative system of rapeseed microspore culture has been set up.
油菜已经建立了子叶、胚轴、原生质体及小孢子培养的再生体系。
Rape have established regeneration system of cotyledons, hypocotyls, protoplasts and microspore culture.
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