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Table 2 The significance of correlation coefficients between Citrus exocortis viroid (CEVd) and Hop stunt viroid (HSVd) from two infected citrus cultivars under different temperature conditions

From: A mutual titer-enhancing relationship and similar localization patterns between Citrus exocortis viroid and Hop stunt viroid co-infecting two citrus cultivars

  Correlation coefficients between CEVd and HSVd
Blood orangea Murcott mandarina
Temperature Low Moderate High Low Moderate High
Allb ++c ++ - ++ ++ ++
Rootstock bark -d ++ - ++ + ++
Root - - - - ++ ++
Twig bark - - - - - -
Leaf - - - - ++ -
  1. aThree nonparametric methods are Spearman’s nonparametric correlation coefficient, Kendall tau rank correlation coefficient and Hoeffding’s inequality
  2. bAll = overall data of blood oranges or Murcott mandarins
  3. ccorrelation coefficients marked with “++” are statistically significant by all three methods and those marked with “+” are statistically significant by two of three methods
  4. dindicates data are not significantly difference