RELATIONSHIP BETWEEN MITOTIC EVENTS AND LEAF SPOTTING IN GLYCINE MAX

1969 ◽  
Vol 11 (1) ◽  
pp. 147-152 ◽  
Author(s):  
B. K. Vig
Keyword(s):  
Glycine Max ◽  
Chromosome Analysis ◽  
Crossing Over ◽  
Root Tips ◽  
Multipolar Spindles ◽  
Glycine Max L ◽  
Chromosome Stickiness

Chromosome analysis of the root tips of Glycine max (L.) Merrill variety T219 revealed several aberrations. Chromosome stickiness, reductional groupings and multiple spindles (as well as multipolar spindles) were observed. In our previous work, we had observed the expression of homozygous genotypes on the heterozygous background in the form of small spots on the leaves of this variety. This paper tends to correlate the two findings. The appearance of some of the spots on the leaves is attributed to the loss of one or more chromosomes, besides somatic crossing-over.

Studies on the expression of somatic crossing over in Glycine max L.

1970 ◽  
Vol 40 (7) ◽  
pp. 316-321 ◽  
Author(s):  
B. K. Vig ◽  
E. F. Paddock
Keyword(s):  
Glycine Max ◽  
Crossing Over ◽  
Glycine Max L

scholarly journals SOMATIC CROSSING OVER IN GLYCINE MAX (L.) MERRILL: MUTAGENICITY OF SODIUM AZIDE AND LACK OF SYNERGISTIC EFFECT WITH CAFFEINE AND MITOMYCIN C

Genetics ◽  
1973 ◽  
Vol 75 (2) ◽  
pp. 265-277
Author(s):  
B K Vig
Keyword(s):  
Glycine Max ◽  
Mitomycin C ◽  
Point Mutations ◽  
Chromosome Breakage ◽  
Chlorophyll Synthesis ◽  
Crossing Over ◽  
Golden Yellow ◽  
Glycine Max L ◽  
Dark Green ◽  
Light Green

ABSTRACT Glycine max (soybean) is one angiosperm which lends itself to the study of somatic crossing over. This is made possible because some varieties have gene combinations Y11Y11, Y11y11 and y11y11 in the segregating populations from Y11y11 plants. The gene in question is responsible for chlorophyll synthesis. The Y11Y11 plants have dark green leaves, Y11y11 are light green and y11y11 plants are golden yellow. The heterozygous plants have dark green, yellow and dark green-yellow (double) spots on the leaves of the untreated control material, whereas the two homozygotes are almost always devoid of somatic sectoring. Application of caffeine, or mitomycin C, to the seeds increased the frequency of double, dark green and yellow spots on the Y11y11 background. Possibly, some dark green or yellow spots originate by failure of one of the two components of what might start as a double spot due to somatic crossing over. The application of NaN3 increases the frequency of dark green or yellow spots, almost exclusively. The two spots increase in equal frequency. The y11y11 plants so treated do not have any light green sectors, but dark green, Y11Y11, plants do develop a few light green or very dark green spots. The data indicate that NaN3 is capable of inducing nondisjunction, but does not cause mutations (at this locus), chromosome fragmentations (segmental losses) or somatic crossing over to an appreciable degree. It has previously been shown that caffeine-induced chromosome rejoining in Vicia faba can be inhibited by treating the roots with NaN3. In the present experiments NaN3 did not affect the processes of somatic crossing over as induced by caffeine or mitomycin C. The effect was additive. This system offers advantages for studying chemical mutagens in that somatic crossing over, point mutations, segmental losses through chromosome breakage and nondisjunction can all be studied in a single treatment to the seeds.

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