Table 4.

Mantel’s t test of correlation analysis of P. amarus accessions based on genetic cophenetic matrix with geographic distance, altitude, temperature minimum, maximum and rainfall

Mantel	r	Mantel t test	Significance	Significance
GD vs GED	0.79513	2.6820	0.0752	0.0000**
GD vs ALT	0.34501	1.5261	0.1849	0.0235*
GD vs Tmin	0.43431	1.4869	0.1356	0.0036**
GD vs Tmax	0.49218	1.6890	0.1332	0.0008**
GD vs RF	0.21069	0.7558	0.1331	0.1750NS

GD genetic distance, GED geographic distance, ALT altitude, Tmin temperature minimum, Tmax temperature maximum, RF rainfall

**P > 0.01, *P > 0.05, and NS not significant based on one tile probability with 999 permutation