The ability of the flower to return to its original position after damage or change of position in space depends on the type of symmetry, reported in New Phytologist. Bilaterally symmetrical flowers mostly unable to restore the desired orientation, and having a star-shaped rarely have this ability. This is probably due to the fact that for successful pollination bilaterally symmetrical flower needs to be in a certain position, and for the other it is not so important.
Below animal pollinator moved the pollen from one flower to another, it is necessary that the elements of the flower (stamens and so on) occupied a certain position relative to each other. For example, if nectaries are located closer to the entrance than the anthers, before the second pollinator is unlikely to get, as he doesn’t need pollen and nectar. Equally important is the place of pistils in the flower, and if they are rotated incorrectly, they may not come into contact with those parts of the body of the pollinator, with pollen. Matters and the state of the whole flower, and if pollinator not even notice or recognize as a suitable object, the transfer of pollen will not occur.
Especially a big role orientation plays for bilaterally symmetrical — zygomorphic flowers, inherent legumes, orchids, and others to Aconite. They can distinguish the left and right side, top and bottom. The flowers of some orchids mimic the females of certain species of pollinating insects, and it is possible that the male will not react with the flower, and if it is upside down. Have actinomorphic flowers (like tulips, cabbage or Magnolia), through which you can draw more than one plane of symmetry, the top and bottom do not differ and their position in space must not be so critical.
So William Scott Armbruster (Armbruster William Scott) from Portsmouth University and Nathan was Tortured (Nathan Muchhala) at the University of Missouri-St. Louis suggested that the ability of plants to restore the original position of the flowers or their parts after nonlethal injury (e.g., plant someone walked or bent it) depends on the type of flower symmetry: zygomorphic have developed it more, the actinomorphic — weaker.
They tested this hypothesis in 23 species of flowering plants from Australia, Europe and the Americas. In some cases, botanists have observed what happens to flowers and buds after being pushed or crushed in the natural environment. On several types of scientists themselves conducted experiments: rotated or tied inflorescences, the individual flowers or their parts (stamens and pistils) to deviate from its natural position by 45 or 90 degrees.
The researchers calculated for each inflorescence or flower precision of pollination (pollination adaptive accuracy) — compliance of the provisions of parts ideal for this kind. This procedure was carried out to offset pilot sites and in a few hours and days after it. The flowers that are closer to the original position, restored the accuracy rate of pollination. If this happens, it’s usually 1-2 days, but sometimes faster.