the pistils contains much more "liquid" volume than stamens that is absorption capacity and radiation-induced mutations will be greater in female part. Btw 30 years ago I conducted a short study using a strong magnetic field as an impact factor and mitosis defects test. I believe that only the volume of liquid solutions is a main component of any physical impact, according to Giorgio Piccardi
Hi Tomas, this is just a hypothesis, though unlike animals, in plants, stamens have a great similarity with spores, at least in their "dormant state" before contact with the pistil, perhaps this explains their natural stability to aggressive impact factors as radiation, temperature etc