Open AccessMeiosis disturbances, aneuploidy and seed fertility in Raphanobrassica
Author(s) -
IWASA SHOICHI,
ELLERSTRÖM SVEN
Publication year - 1981
Publication title -
hereditas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 50
eISSN - 1601-5223
pISSN - 0018-0661
DOI - 10.1111/j.1601-5223.1981.tb01321.x
Subject(s) - biology , meiosis , fertility , triticale , population , selection (genetic algorithm) , agronomy , genetics , demography , gene , artificial intelligence , sociology , computer science
Meiosis was studied in one F 2 ‐ and one F 7 population of the amphidiploid hybrid Raphanobrassica , the F 7 ‐population being the result of uninterrupted fertility selection. Univalents at M 1 and laggards and bridges at A 1 and A II are frequent, resulting in aneuploid gametes and plants. These disturbances are supposed to be caused by insufficient meiotic timing between the parental genomes, i.e. the same explanation as has been given for similar disturbances in triticale. There are no indications that repeated selection resulting in improved seed fertility has any influence on the rate of disturbances at meiosis. Meiosis appears to be only slightly influenced by external factors, while seed fertility is considerably influenced. The best seed fertility so far obtained from material grown in greenhouses in SvalÖv is 31 %. A seed fertility of 43 % has been obtained from the same material when grown in the field in Spain. Raphanobrassica has potentials to become an interesting annual fodder crop if an economic seed production can be made possible through further improvements of seed fertility and by a proper choice of propagation sites. The population will, however, still be impaired by the same meiotic irregularities as the present material of Raphanobrassica .