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Table 1 Significance of correlation coefficients for titers of Citrus exocortis viroid (CEVd) and Hop stunt viroid (HSVd) in four tissues of two citrus cultivars from the field and greenhouse

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

  

CEVd and HSVd

Numbers of citrus plants

Tissues

Nonparametric methodsa

17 citrus plants

All

++b

7 citrus plantsd

All

++

11 Blood oranges

Roots

-c

Rootstock bark

++

Twig bark

-

Leaves

++

6 Murcott mandarins

Roots

++

Rootstock bark

++

Twig bark

-

Leaves

-

Double infectionse

Roots

++

Rootstock bark

++

Twig bark

++

Leaves

++

12 citrus plantsf (Sets in greenhouse)

All

++

  1. aThree nonparametric methods are Spearman’s nonparametric correlation coefficient, Kendall tau rank correlation coefficient and Hoeffding’s inequality
  2. bcorrelation coefficients marked with “++” are statistically significant by all three methods; those marked with “+” are statistically significant by two of three methods
  3. cindicates no significant difference
  4. dThere were no underdetermined values in this data set including 3 Blood oranges and 4 Murcott mandarins
  5. eincludes 5 Blood oranges and 4 Murcott mandarins
  6. fArtificially double inoculated plants include 6 Blood oranges and 6 Murcott mandarins