Table 1. Quantitative Trait Loci for Natural Variation in Petal Shape and Size.
| QTL Name | Petal Trait | Chr | LOD Score | PVE | Effect of the Col Allele on the Trait | Map Marker Closest to the QTL peak | Map Marker at Start of the 2-LOD 95% CI | Map Marker at End of the 2-LOD 95% CI | Number of Genes in the 2-LOD Interval | Candidate Floral or Growth Regulator Genes in the 2-LOD Interval |
| CL-W1 | Width | 1 | 3.13 | 10 | Decrease | AT1G12240 | AT1G04550 | AT1G18260 | 2094 | YAB2, NUB, KLUH |
| CE-S1 | Shape | 1 | 3.43 | 9 | Decrease | AT1G43560 | AT1G31730 | AT1G43780 | 1147 | SEUSS |
| CL-W2 | Width | 1 | 2.73 | 7 | Decrease | AT1G80580 | AT1G72140 | AT1G81020 | 1269 | PIN1, CLV1 |
| CL-L1 | Length | 2 | 5.4 | 12 | Increase | AT2G13990 | AT2G13590 | AT2G14870 | 185 | |
| CL-L2 | Length | 2 | 5.65 | 17 | Increase | AT2G18940 | AT2G17090 | AT2G23910 | 1008 | ULT2 |
| CL-A1 | Area | 2 | 6.1 | 21 | Increase | AT2G20020 | AT2G18580 | AT2G23910 | 795 | ULT2 |
| CL-S1 | Shape | 2 | 25.4 | 51 | Increase | AT2G26290 | AT2G25910 | AT2G26820 | 132 | ER |
| CE-S2 | Shape | 2 | 6.7 | 14 | Increase | AT2G26850 | AT2G26290 | AT2G28940 | 394 | ER |
| CE-L1 | Length | 2 | 3.1 | 11 | Increase | AT2G31080 | AT2G31080 | AT2G39010 | 1219 | ETT, ROT4 |
| CL-S2 | Shape | 3 | 9.55 | 13 | Decrease | AT3G17410 | AT3G15510 | AT3G20430 | 729 | CUC1 |
| CL-L3 | Length | 4 | 4.08 | 12 | Increase | AT4G00480 | AT4G00010 | AT4G02940 | 475 | |
| CL-S3 | Shape | 4 | 3.73 | 4 | Increase | AT4G27220 | AT4G17870 | AT4G35080 | 2640 | ULT1, LEUNIG |
| CL-A2 | Area | 4 | 6.6 | 18 | Decrease | AT4G28950 | AT4G25400 | AT4G31650 | 936 | ULT1 |
| CL-W3 | Width | 4 | 2.39 | 7 | Decrease | AT4G29490 | AT4G17870 | AT4G35080 | 2640 | AG, ULT1, LEUNIG |
| CE-L2 | Length | 4 | 6.39 | 19 | Decrease | AT4G29658 | AT4G28485 | AT4G30590 | 354 | ULT1 |
| CE-A1 | Area | 4 | 4.6 | 14 | Decrease | AT4G29658 | AT4G25640 | AT4G34390 | 1342 | ULT1, LEUNIG |
| CE-W1 | Width | 4 | 4.55 | 14 | Decrease | AT4G30590 | AT4G29658 | AT4G34390 | 737 | LEUNIG |
| CE-W2 | Width | 4 | 4.5 | 15 | Decrease | AT4G36580 | AT4G34390 | AT4G38780 | 629 | ROT3 |
| CL-W4 | Width | 5 | 2.58 | 8 | Decrease | AT5G35070 | AT5G25900 | AT5G40450 | 1863 | EEP1, AN3 |
| CE-S3 | Shape | 5 | 6.86 | 17 | Increase | AT5G49570 | AT5G47590 | AT5G52500 | 727 | CUC2 |
| CL-S4 | Shape | 5 | 7.41 | 9 | Increase | AT5G53740 | AT5G44750 | AT5G54230 | 1396 | MIR160C, CUC2 |
| CE-W3 | Width | 5 | 3.18 | 11 | Decrease | AT5G58940 | AT5G55220 | AT5G63650 | 1224 | REV, LFY, ARF2, ERL1 |
| CE-A2 | Area | 5 | 3.79 | 10 | Decrease | AT5G63650 | AT5G55220 | AT5G63650 | 1224 | REV, LFY, ARF2, ERL1 |
The first two letters of the QTL name designate the parental lines from which the recombinant inbred lines were derived, C for Columbia, E for Estland-1, L for Landsberg erecta. Chr, the chromosome to which the QTl was mapped. LOD, likelihood of difference score. PVE, percentage of the variance explained (R2). CI, Confidence Interval. All petal trait measurements are normalized to comparable sepal data apart from petal shape, which is calculated as the ratio of petal length/petal width.