Meiotic duration in wheat genotypes with or without homoeologous meiotic chromosome pairing

摘要: In order to investigate the possible relation between meiotic time and chromosome pairing behaviour, meiosis was timed in various forms of wheat hybrids. First, ten Triticum aestivum (var. Chinese Spring) genotypes with different constitutions which differed widely behaviour. Secondly, escape from disadvantage aneuploid material, also plants extent homoeologous because activities alleles at one or two loci. For this experiment use made F 1 -hybrids cross T. x Aegilops mutica which, although they all have 28 chromosomes, differ amount pairing. Thirdly, 28-chromosome 29-chromosome derived rye (Secale cereale) 43-chromosome containing a single Ae. addition known carry genes greatly affect level wheat. Although display very little (chiasma frequency per cell (c. f.) = 0.5) while much higher f. 7.8) no difference detected them. Similarly, duration not significantly three types had chiasma frequencies 14.3, 7.4 0.9. Thus, these results agree showing that there correlation The obtained for Spring provided evidence support notion is process. Consequently some doubt must be cast upon idea available limiting It shown individual chromosomes their effects on duration. instance, absence 7B has detectable effect 5B resulted an increase found euploid (24 h) tetraploid species (about 30 h). By using ditelosomic L it most, if all, genetic are determined by short arm.