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|Title: ||Cytological and pigmentation studies in certain cultivars and mutants of Bougainvillea|
|Authors: ||N, Anand|
|Guide/Chairperson: ||R N, Bhat|
|Issue Date: ||1996|
|Year of Submission: ||1996|
|Abstract: ||Studies were carried out to compare the cytological pigment differences associated with
varied bract colours in certain Bougainvillea cultivars and mutants. The Bougainvillea
genotype including induced mutants were selected. The quantitative and qualitative status
of pigments showed considerable variations. The estimated betacyanin content expressed
as O.D. value was observed to be maximum in cv. Elizabeth (1.7638) followed by
colchicines induced mutant ‘Zakariana’ (1.2007) with the lowest bract (pH 5.87).
Estimated bract betaxanthin content was found to be maximum in cv. Mrs. Enid
Lancaster (1.5422) followed by cv. Tomato Red (1.0922). Therefore the ratio was of bract
betacyanin to betaxantin was the highest in cv. Dr. H.B. Singh (2.4901) with highest
record bract pH (6.53) and the lowest betacyanin to betaxanhin ratio was observed in cv.
Lady Mary Baring (0.1497). Qualitative estimation of bract pigments by paper
chromatography on the basis of Rf values were grouped. Two betaxanhin bands were
observed in all the genotypes studies except in cv. Dr.H.B.Singh. this variation in pigment
content seems to influence upon light and dark coloured bracts of induced mutants.
Cytological studies in the cultivars and mutants indicated no loss of the chromosomes in
gamma irradiated and colchicine treated mutants. Miotic behaviour varied from normal
behavior showing less number of univalents and pollen mother cells having laggards.
Whereas in highly abnormal behavior more number of univalents and laggards were
observed in metaphase I and anaphase I and II, respectively. Among the mutants gamma
rays induced mutant ‘Zakariana’ had less miotic behavior than its parent. Thus the
uniformity in gametic chromosome number and variations in bract colour is attributed to
the effects of genes controlling the bract colour expression.|
|University in which they received their degree: ||University of Agricultural Sciences, Bangalore|
|Degree Level: ||M.Sc|
|Appears in Collections:||DIVISION OF ORNAMENTAL CROPS|
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