Genome-Wide Association Studies for Striga asiatica Resistance in Tropical Maize

Table 6

A -test analysis for stress tolerance indices for the derived traits.

	GRTI	CobTI	LeafTI	RootTI	ShootTI	StemTI	TbioTI
Group A mean	18.15	15.73	19.5	9.07	18.91	12.27	22
Group A size	13	11	8	14	11	11	7
Variance for group A	104.8	80	6	29.9	93.6	17.8	4.6
Standard error of group A	2.83	2.69	0.86	1.46	2.91	1.27	0.81
Group B mean	17.82	18.36	28.9	25.75	16.69	26.27	30
Group B size	17	11	10	16	13	15	8
Variance for group B	99.9	100.2	12.1	26	86.2	23.3	8.5
Standard error of group B	2.42	3.01	1.1	1.27	2.57	1.24	1
Mean differences	0.33	-2.63	-9.4	-16679	2.21	-13.99	-8
Standard error of the difference	3.72	4.04	1.45	1.93	3.87	1.82	1.34
-value	0.09	-0.65	-6.45	-8.64	0.57	-7.68	-5.94
Degrees of freedom	28	20	16	28	22	24	13
-probability	0.93	0.522	<0.001	<0.001	0.573	<0.001	<0.001

GRTI: growth rate tolerance index, CobTI: cob biomass tolerance index, LeafTI: leaf biomass tolerance index, ShootTI: shoot biomass tolerance index, StemTI: stem biomass tolerance index, TbioTI: total biomass tolerance index.