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Estimation of induced mutation rates of four esterase genes in barley (Hordeum vulgare L.)

100%

Kucharska M. , Maluszynski M.

Journal of Applied Genetics

1998

tom 39

nr 2

141-145

. Induced mutation rate of barley esterase loci has been estimated. Results suggested that about 3% of investigated M1 spikes had seeds which gave rise to M2 seedlings mutated in one of four esterase loci. M1 plants were obtained after chemical treatment of seeds from two spring barley cultivars Aramir and Bielik. The majority of mutants were reconfirmed in the M3 generation.

Length of the interautogamous interval (IAI) in wild and mutant stocks of Paramecium tetraurelia

100%

Prajer M. , Kosciuszko H.

nr 3-4

85-90

Duration of the interautogamous interval (IAI) was studied in wild and mutant stocks of Paramecium tetraurelia. The investigations revealed slight but statistically significant differences in IAI duration in complementary mating types of some stocks of P. tetraurelia. A certain range of variability characterized the duration of this period in particular stocks. The greatest variability observed in mutant stock d4-108 may result from abnormal, unequal macronuclear divisions frequent in these mutant cells. In none of the investigated stocks is parental age of relatively young, mature for autogamy cells related to the IAI duration in progeny generation.