The similar phenomenon was observed at poecilophyllous plants of a lion's pharynx, a geranium, enoter, a plantain. These facts can be explained, having assumed that poecilophyllous plants have two types of plastids: normal and abnormal, not capable to form a chlorophyll. At reproduction of the normal are formed normal, and of the abnormal – abnormal (plastids are white. Of the semyapochka including both types of plastids by mitotic divisions it is formed the ova bearing only white or both those and other plastids at the same time.
For the same reason it was impossible to use at the main grain culture wheat though when crossing of specially picked up grades it is shown not less strongly, than at corn. Now geneticists and selectors work on creation of geterozisny hybrids of wheat on a sterile basis.
With each crossing at the maternal line remains less and less the hereditary factors, they are replaced with factors of the line taken for the sating crossing. As a result of six-seven returnable crossings and selection plants, on all signs similar to the fatherly line, but possessing male sterility turn out. They are called sterile analogs of the fertile lines used as a fatherly form.
Long modifications. The temporary changes of signs caused by external impacts on cytoplasm and remaining during several generations are called as long modifications. At the termination of influences completeness and force of manifestation of these changes from generation to generation weaken. Long modifications sometimes are found in certain representatives of posterity throughout several or even many generations.
Some scientists read out as an immediate cause of formation of forms violation of synthesis of protein as a result of the mutation in a kernel leading to the wrong mikrosporogenez from TsMS, others connect a degeneration of pollen grains with violation of supply of food of boots of sterile plants.