Rye Inbred Lines Research Articles

The response of diploid and tetraploid rye genotypes to phosphate treatments and to cold temperature

SummaryAs an indication of heritable variation between genotypes, the response of diploid and autotetraploid homozygous inbred lines of rye to varying applications of inorganic nutrients and to temperature ‘shocks’ during growth was studied. The results indicated first that developmental differences occur between lines and between diploids and tetraploids under comparable conditions of growth. Secondly, the consequences of altering growing conditions can differ between lines and between diploids and tetraploids. Thirdly, the effect of polyploidy upon the response to these treatments was shown to vary between lines. It is concluded that an assessment of plant growth and development must take into consideration the genie, chromosomal and environmental interactions.

Chiasma variation and control in pollen mother cells and embryo-sac mother cells of rye

SUMMARYMean chiasma frequencies and the amounts of between-bivalent chiasma variation were computed for pollen mother cells (p.m.c.) and embryo-sac mother cells (e.m.c.) of five distinct inbred rye lines. Despite the considerable differences for both these metrics shown by the different lines, very little variation was seen between p.m.c. and e.m.c. belonging to the same lines. It is concluded that chiasma formation in p.m.c. and e.m.c. of rye is governed and regulated by a single controlling system of genes and that variation in this genetic system is expressed identically in the two sexes.

Genetic control of radiation-induced chromosome exchange in rye

The number of interchanges detected at meiosis in four inbred lines of rye and their six hybrids after irradiation with 200 rads of Co 60 gamma rays varies considerably between genotypes. The variation appears to depend on variation in induction, and not detection. Several, probably many, genes give rise to the variation. They show incomplete dominance and possibly non-allelic interaction. No reciprocal differences were found. The proportions of interchanges appearing as rings or chains of four, or chains of three, chromosomes at metaphase varies between the lines in a manner not directly related to the small differences in metaphase pairing.