Natural Variation of Chromosome Length and a Critical Assessment of the Karyotype in Sweet Pea

That the different horticultural strains of sweet pea (Lathyrus odoratus Linn .) have evolved through structural alteration of chromosomes and they represent dif ferent chromosomal biotypes have become evident by applying improved techniques (Sharma and Datta 1959). Reports of the natural occurrence of variation of length and diameter of chromosomes (Baetcke et al. 1967, Bennett and Rees 1969, Bennett 1970) necessitate a more critical and careful judgement on the analysis of karyotype. The present investigation is with a few more strains of sweet pea with special care and attention on natural variations in chromosome lengths.