Indian Society of Genetics & Plant Breeding

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Genetic diversity within sucrose rich parental pool of sugarcane and its application in sugarcane breeding through hybridization and selection

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Genetic diversity in 82 high sucrose genotypes of
sugarcane was estimated using 30 sugarcane specific
STMS primers. The overall SI values using three diversity
measures viz., Dice, Jaccard’s and simple matching
methods were 0.69, 0.54 and 0.74 respectively, indicating
the existence of moderate diversity among the clones and
the scope of improving sucrose content through breeding.
The dendrogram analysis among the 82 sugarcane types
showed that two pairs of clones (Co 200002 and Co 86005
and, Co 91017 and 89005) were identical. Though the
clustering of clones reflected the pedigree relationship
between the cultivars, deviations from this were observed
and could be attributed to the high heterozygosity and
polyploidy of the genus Saccharum that lead to gross
differences in phenotype and genotype. The more diverse
clones were Co 87009, Co 86002, Co 90006, Co 86014, Co
775, Co 87011 and Co 85037. Out of 3321 possible
combinations, 443 combinations were genetically more
similar (SI = 0.83) which might not provide incremental
gains through hybridization, while 813 combinations (SI=
0.69) were genetically more diverse and 2206 combinations
showed moderate diversity (SI = 0.70-0.82). Such diverse
clones and combinations have immediate application in
breeding for improving efficiency and precision in
sugarcane breeding. Based on diversity estimates,
hybridization involving four genetically diverse, three
genetically similar and three with intermediate similarities
were affected and progeny performance correlated with
genetic diversity. A strong correlation (–0.7265) between
genetic diversity and cross performance and cross
selection rate from crosses with high and medium diversity
indicated the importance of diversity estimates in the
choice of parents and to estimate genetically more similar
crosses.
 

Keywords: Genetic diversity, STMS markers, hybridization, sugarcane

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Year: 2010
Volume: 70
Issue: 2
Article DOI: N/A
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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