Table 4.

DNA polymorphism data for F. graminearum isolates based on beta-tubulin (TUB), translation elongation factor 1 alpha (TEF) and histone (HIS) gene sequence comparisons.

Gene Loci	Region of Collection	Number of Isolates (N)	Number of Segregating Sites (S)	Number of Haplotypes (H)	Haplotype Diversity (Hd)	Nucleotide Diversity (π)
TUB	PB	47	5	7	0.816	0.013
	HR	27	6	10	0.900	0.019
	RJ	28	6	11	0.865	0.015
	WB	21	6	8	0.838	0.012
	Total	123	6	11	0.846	0.015
TEF	PB	47	197	12	0.891	0.056
	HR	27	195	11	0.883	0.128
	RJ	28	197	13	0.939	0.089
	WB	21	196	7	0.671	0.061
	Total	123	197	15	0.888	0.080
HIS	PB	47	7	14	0.920	0.006
	HR	27	7	10	0.855	0.005
	RJ	28	7	11	0.857	0.004
	WB	21	7	10	0.919	0.006
	Total	123	7	17	0.893	0.893
Combined loci	PB	47	384	23	0.965	0.072
	HR	27	381	18	0.972	0.097
	RJ	28	385	21	0.981	0.098
	WB	21	381	13	0.962	0.070
	Total	123	385	30	0.974	0.083

Haplotype diversity and nucleotide diversity are important indicators of population genetic variation. Haplotype and nucleotide diversities are generally considered to be low where haplotype diversity (Hd) and nucleotide diversity (π) are less than 0.5.