[Show abstract][Hide abstract] ABSTRACT: The performance of quantitative traits in sugarcane (Saccharum spp. complex) often varies across diverse environments because of significant genotype-by-environment interaction (GEI). Our objective was to assess performance stability of 20 advanced sugarcane genotypes across six environments, including two crop seasons in Punjab. Data were obtained on cane yield (t/ha), sucrose % juice, and commercial cane sugar % at harvest and subjected to GGE [genotype (G) plus genotype-environment (GE)] biplot analysis, which revealed high positive correlations between spring and autumn crop seasons at all locations for all measured traits. This implied that genotypes could be evaluated in either crop season, which should reduce testing cost and time. Test environment Faridkot (FDK) spring, being both discriminating and representative, was an ideal test environment for selecting generally adapted genotypes for cane yield. Similarly, Ludhiana (LDH) autumn was an ideal test environment for selecting generally adapted genotypes for quality traits. Co 0238 and CoPb 08214, having high mean performance and stability across environments for cane yield and quality traits, were identified as ideal genotypes. These genotypes can be exploited commercially for the entire state of Punjab. The GGE biplot helped identify a specifically adapted genotype, CoH 119, which was the best performer in Gurdaspur (GDSP) in both crop seasons.
[Show abstract][Hide abstract] ABSTRACT: Tillers carry leaves, determine leaf area index and indirectly influence the amount of photosynthetically active radiation (PAR) intercepted by the sugarcane canopy. Tillers develop into stalks, the sink for the products of photosynthesis. The objective of this study was to investigate the effects of seasons and varieties on tiller population development trends and parameters using different varieties (ZN6, ZN7, N14 and NCo376). Three replicated experiments were established in early (March), mid (July) and late (October) seasons at Zimbabwe Sugar Association Experiment Station. The tiller population development parameters were determined in each plot and the data were analysed for seasonal and varietal effects using the mixed procedure of SAS. The tiller development parameters investigated were: peak tiller population (PTP), final tiller population (FTP), thermal time to peak tiller population (TTTP), thermal time per tiller (TTPT) and tiller survival rate (TSR). The order of importance of the parameters was season > variety > variety x season. The study suggested the presence of genotype by environment (GxE) interaction for PTP. The cane yield of the varieties significantly (P mid > late season.
South African Journal of Plant and Soil 01/2011; 28(1):11-16.
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