Studies on Genetic Enhancement of Sugarcane (Saccharum officinarum L.) Productivity for Organic Jaggery Production
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Date
2013
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UAS Dharwad
Abstract
The present investigation was taken up to elucidate the information on the variability
present in the component traits of cane, sugar and jaggery yield and the amount to which it is
heritable. Inter and intra class correlation was also studied across generations. The genetic
and molecular diversity to assess the contribution of characters towards the divergence to
classify the clones was also studied. Further genotype x environment interaction was studied
to assess the relative stability of sugarcane genotypes for productivity triaits of cane, sugar
and jaggery yield.
The GCV and PCV for total shoots, cane height, internodal length, number of millable
canes (NMC), cane yield and HR brix%, were higher, whereas moderate variability was
observed for cane girth and single cane weight (SCW).
The association studies revealed that, single cane weight, number of millable canes
and cane height were the strongest with cane yield. The path analysis shows that, NMC and
SCW showed higher direct effect on cane yield. The repeatability studies indicated that
NMC, SCW and HR brix% were significantly repeatable across generations.
Diversity analysis indicated NMC, SCW and cane height contributed maximum to the
total divergence. Molecular diversity using SSR markers detected 95.9 per cent
polymorphism and primers NKS 6, 7, 23, 30, 32, 34 and 38 were particularly useful in
diversity studies.
The stability analysis for cane and jaggery yield revealed that the genotypes viz., SNK
07680 and SNK 07337 and SNK 07658 were stable across environments.
Among the genotypes for jaggery quality parameters, SNK 07680 was significantly
superior compared to Co 86032 followed by SNK 07337 and SNK 07658. SNK 07680 and
SNK 07337 are non flowering across generations and locations, whereas SNK 07658 is very
late to non flowering in all the locations studied for flowering behavior.