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试验区分杨树花药愈伤组织三种类型：花粉、花丝和药壁或药隔愈伤组织。显然，激光能提高花粉愈伤组织的芽分化率。
The experiment distinguishes three types of anther callus of poplar: pollen, filament and wall of drug or callus. Obviously, laser can improve the rate of bud differentiation in pollen callus.