Table 1. Significant QTL for the two trials at the chromosome-wide level of P < 0.01 for tillers and numbers of axillary branches (square root transformed).

	Trial 1						Trial 2
Trait	Chromosome	Position, cM	Additive	Dominance	R2, %	Candidate genes	Chromosome	Position, cM	Additive	Dominance	R2, %	Candidate genes
Tiller no.	I	95	+0.22	−0.27	5.5	ATSUR1	I*	89	+0.40	+0.22	11.5	ATSUR1
							II	20	+0.02	−0.43	5.5
	†						III*	114	+0.51	+0.12	14.9
	III	140	+0.23	−0.46	10.6
	†						III	160	+0.27	+0.07	4.6
	IV	109	+0.51	+0.32	11.3	OSMOC1
	V	80	+0.42	+0.21	9.1
	V*	115	−0.70	+0.24	28.1		V*	122	−0.39	+0.16	9.1
							VII	65	+0.31	+0.02	5.4
							IX*	135	+0.46	+0.39	12.4	ATSPS1
							IX*	149	+0.47	+0.30	9.2	ZMTB1, ATAXR1
Axillary branch no.	II	108	−0.49	+0.33	8.8
	III	96	+0.45	−0.36	9.2
	IV	76	+0.51	−0.17	6.9		IV	69	−0.39	+0.14	5.2
	IV	109	+0.74	+0.63	11.8	OSMOC1
	V	60	+0.74	+0.32	14.4		V	59	+0.37	+0.33	4.9
	V	117	+0.62	+0.12	8.7		V	103	+0.53	+0.29	9.5
	VI	73	−1.02	+0.32	24.8		VI	71	−1.11	+0.31	37.7
							VII	62	+0.32	+0.12	3.8
	IX	131	+0.75	+0.42	14.8	ATSPS1	IX	147	+0.38	+0.08	4.2	ZMTB1, ATAXR1

QTL significant at the genome level of P < 0.05 are marked with asterisks. Positive additive and dominance effects correspond to an increase in the phenotypic value for that trait (numbers represent deviation from the mean inter-parental value). R² values are the percentage of phenotypic variation explained by a QTL. QTL in bold represent those that are shared between the two trials. Positions marked with † indicate QTL in one trial at the chromosome-wide level of P < 0.05 that correspond to a QTL in the other trial at the chromosome-wide level of P < 0.01. ATAXR1, Arabidopsis thaliana auxin resistant1; ATSUR1, Arabidopsis thaliana superroot1; ATSPS1, Arabidopsis thaliana supershoot1; OSMOC1, Oryza sativa monoculm1; ZMTB1, Zea mays teosinte branched1.