Co 11015 (Atulya) has been notified for cultivation in Tamil Nadu as a short duration variety in the 83 rd meeting of Central Sub Committee on Crop Standards, Notification, Government of India. This variety combines high cane yield and high sucrose content right from 8 months to 12 months of crop age. Co 11015 is evolved from the cross CoC 671 and Co 86011 at ICAR-Sugarcane Breeding Institute, Coimbatore. The clone showed a remarkably good performance in the clonal trials with clear superiority over the standards Co 86032 and CoC 671. In station trials, it recorded a cane yield of 135.70 t ha -1 , sucrose of 21.46 % and sugar yield of 20.09 t ha -1 at 360 days. Fig. 2. Morphological features of sugarcane short duration variety Co 11015
Sucrose is the key economic trait in sugarcane which is a highly polyploid multi-species hybrid and shows a complex pattern of trait inheritance. The excessively large genome of sugarcane is comparatively less explored through Next Generation Sequencing tools for creating superior varieties. In this study, RNAseq libraries of two extreme bulks from a segregating full-sib population and its parents were used to identify 9905 conditionspecific non-synonymous genetic variants (NSVs), out of which 43 had a very high degree of differential enrichment (∆f >0.5) for contrasting sucrose accumulating conditions. The statistical model used in this study which was able to quantify the relative effect of NSVs on the trait detected highly significant positive and negative effect NSVs located in the coding regions of genes involved in sucrose metabolism, photosynthesis, mitochondrial electron transport, glycolysis and transcription. In addition, a few differential pre-mature stop codons that could result in production of truncated proteins were also detected in genes coding for aquaporin, GAPDH, aldolase, cytochrome C-oxidase, chlorophyll synthase and plant plasma membrane intrinsic proteins. Additionally, a total of 2140 differentially expressed genes (DEGs) linked to high sucrose accumulation were identified. Among the DEGs, sucrose phosphate synthase III, genes involved in transport, auxin signal transduction, etc., were upregulated, while those involved in electron transfer, cytochrome P450, etc., were downregulated in high sucrose accumulation conditions. This study was able to give finer insights in to the role of allelic heterozygosity on sucrose accumulation and the identified NSVs and DEGs could be useful as candidate markers in marker-assisted breeding for developing high sugar varieties.
Combining ability estimates were obtained from line x tester analysis of crosses involving five male sterile lines and seven pollinator varieties. Predominance of non-additive gene action was observed for all the characters studied. Ponni for productive tillers per plant and total drymatter accumulation and IR 58025 A for grain yield per plant and total drymatter accumulation were identified as superior parents with high per se performance and significant gea effects. The cross combinations V 20A X IR 50400-64-1-2-2-2, PMS 10A X Ponni and IR 6829A BR 736-20-3-1 were found to be the best specific combiners. The crosses showing significant sea for grain yield per plant were obtained from good X good, good X poor, poor X good and poor X poor combinations.
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