Genotype x environment interactions for cane and sugar yield, and their implications in sugarcane breeding

Crop Science (Impact Factor: 1.51). 01/1984; 24:435-440. DOI: 10.2135/cropsci1984.0011183X002400030002x
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    ABSTRACT: Genotype by environment interaction (GxE) influences and complicates the selection of superior genotypes in trials by confounding the determination of true genetic values. In South Africa, variety trials are planted at several locations and harvested in the plant to third ratoon crops. The objective of this study was to determine the trends in components of GxE and their implications. The MIXED procedure of Statistical Analysis System (SAS) was used to estimate variance components. Genotype by location interaction was significant for the irrigated and coastal long-cycle programs, indicating the importance of identifying and characterizing sites. Genotype by crop-year interaction was larger and more significant for rain-fed than for irrigated cropping system, indicating the importance of ratooning ability in rain-fed regions. Genotype by location by crop-year interaction was significant (P < 0.01) for yield and sucrose content, highlighting the complexity associated with breeding sugarcane. The coastal long-cycle program was the most complex and generally characterized by large GxE. Separating the coastal hinterland and coastal average potential would be recommended to reduce GxE.
    Journal of Crop Improvement 01/2012; 26(2):163-176.
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    ABSTRACT: To evaluate 110 clones against standard variety CP77-400 a non replicated double row trial was laid out having net plot size measuring 5X2.4m Keeping in view the desirable characters, 42 clones having desir-able birx % growth and other quantitative characters were selected and were promoted to preliminary varietal trial while 68 clones were rejected due to undesirable characters, However 5.45%, 10.90%, 9.09%, 3.63%, 8.18% 4.54% and 2.72 clones were rejected, due to poor growth, pithiness, low brix %age, aerial roots, cracks sprouts disease susceptibility, insect/pest infestation, hairiness lodging and short needed length respectively.
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    ABSTRACT: The objective of this investigation was to evaluate seed yield of twenty durum wheat (Triticum turgidum spp. durum) genotypes. Evaluation of genotype × environment interaction and stability were also carried out at five diverse locations during the 2007-2009 growing seasons. Significant differences were found among the genotypes for seed yield on individual years and combined over years, in all locations. Genotype × environment interaction showed significance (p>0.001) for seed yield. According to the coefficients of linear regression and deviations from the regression model, genotypes G2, G7 and G8 proved to be the most stable while based on α and λ parameters, genotypes G7, G12 and G13 were identified the most stable. Clustering genotypes based on all stability methods and mean yield divided them into four major classes, which Class II had relatively high stability and high mean yield performance. To compare relationships among stability statistics, hierarchical clustering procedure showed that the ten stability statistics and mean yield could be categorized into three major groups, which methods of Group C indicated dynamic concept of yield stability. The genotypic stability, stability variance, superiority index and desirability index provide information for reaching definitive conclusions. Also, the best recommended genotypes, according to the present investigation, were G2 (2697.18 kg ha -1), G7 (2644.70 kg ha -1), G8 (2580.16 kg ha -1) and G10 (2637.43 kg ha -1), which had high mean yield and were the most stable genotypes based on the above mentioned stability statistics.
    Notulae Scientia Biologicae. 12/2013; 4(3):57-64.