SIMNIC-CRAIOVA
University of Craiova
The usefulness of multiple index improvement of a diallel of (7×6) corn lines
--Paraschivu, I, Aurelian, M, Paraschivu, M, Bonea, D, Gavrilescu, L, Matei, G
The research was done in the irrigated field of the corn improvement lab on a brown-red soil from S.C.D.A., Simnic-Craiova, Romania. Our objective was to characterize inheritance of rot resistance of the corn stalk and of senescence in a diallel of (7×6) corn lines. The experiment lasted three years; we used artificial inoculation with Fusarium moniliforme, the fungus which is most prevalent in the southern part of Romania and which causes stalk rot.
We selected 7 corn lines with diverse resistance to Fusarium stalk rot. The resistance scoring used the following notation scale (Figure 1).
Figure 1. Fusarium stalk rot is scored using the FAO 1–9 scale. Senescence is scored using the FAO 1–9 scale.
Table 1. The F1 hybrid classification using multiple index values.
| No. | Combination | The complex index classification Production × Mechanical resistance | Average values Stalk rot resistance 1-9 (FAO) |
Classification | Average values Senescence 1-9 (FAO) |
Classification | The multiple index values 2×4×6 |
Classification |
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 1 | A 239 × A632 | 1 | 5.2 | 7 | 3.2 | 9 | 63 | 5 |
| 2 | A 239 × CH 539-9 | 24 | 6.0 | 13 | 3.1 | 8 | 2496 | 22 |
| 3 | A 239 × ND 481 | 14 | 6.1 | 14 | 5.3 | 23 | 4508 | 27 |
| 4 | A 239 × Oh 561 | 11 | 4.8 | 4 | 2.7 | 4 | 176 | 8 |
| 5 | A 239 × A 619 | 38 | 5.2 | 7 | 2.9 | 6 | 1596 | 19 |
| 6 | A 239 × CH 592-13-2 | 10 | 4.3 | 1 | 2.7 | 4 | 40 | 3 |
| 7 | A632 × A 239 | 13 | 6.0 | 13 | 3.7 | 14 | 2366 | 21 |
| 8 | A632 × CH539-9 | 5 | 5.9 | 12 | 4.0 | 16 | 960 | 17 |
| 9 | A632 × ND 481 000 | 30 | 6.3 | 16 | 5.7 | 26 | 12480 | 38 |
| 10 | A632 × Oh 561 | 6 | 5.4 | 8 | 3.4 | 11 | 528 | 13 |
| 11 | A632 × A 619 | 20 | 5.5 | 9 | 3.4 | 11 | 1980 | 20 |
| 12 | A632 × CH 592-13-2 | 27 | 5.7 | 11 | 3.7 | 14 | 4158 | 26 |
| 13 | CH 539-9 × A 239 | 25 | 5.1 | 6 | 2.8 | 5 | 750 | 16 |
| 14 | CH 539-9 × A632 | 21 | 4.8 | 4 | 2.6 | 3 | 252 | 10 |
| 15 | CH 539-9 × ND 481 | 26 | 6.3 | 16 | 5.4 | 24 | 9984 | 32 |
| 16 | CH 539-9 × Oh 561 | 4 | 5.4 | 8 | 3.1 | 8 | 256 | 11 |
| 17 | CH 539-9 × A 619 000 | 39 | 6.3 | 16 | 4.3 | 19 | 11856 | 36 |
| 18 | CH 539-9 × CH 592-13-2 | 35 | 5.4 | 8 | 3.5 | 12 | 3360 | 24 |
| 19 | ND 481 × A 239 | 31 | 6.0 | 13 | 4.3 | 19 | 7657 | 30 |
| 20 | ND481 × A632 000 | 34 | 6.2 | 15 | 5.1 | 22 | 11220 | 35 |
| 21 | ND 481 × CH 539-9 000 | 32 | 6.8 | 19 | 4.7 | 21 | 12768 | 39 |
| 22 | ND 481 × Oh 561 | 29 | 6.6 | 18 | 4.5 | 20 | 10440 | 33 |
| 23 | ND 481 × A 619 000 | 42 | 7.2 | 21 | 6.3 | 28 | 24696 | 42 |
| 24 | ND 481 × CH 592-13-2 | 22 | 5.7 | 11 | 5.1 | 22 | 5324 | 29 |
| 25 | Oh 561 × A 239 *46.7 | 2 | 5.5 | 9 | 2.6 | 3 | 54 | 4 |
| 26 | Oh 561 × A632 | 12 | 6.1 | 14 | 3.8 | 15 | 2250 | 23 |
| 27 | Oh 561 × CH 539-9 | 17 | 4.9 | 5 | 3.0 | 7 | 5950 | 15 |
| 28 | Oh 561 × ND 481 | 19 | 5.6 | 10 | 4.6 | 21 | 3390 | 25 |
| 29 | Oh 561 × A 619 | 9 | 5.6 | 10 | 2.9 | 6 | 540 | 14 |
| 30 | Oh 561 × CH 592-13-2 | 18 | 6.6 | 3 | 2.5 | 2 | 108 | 7 |
| 31 | A 619 × A 239 * 38.3 | 3 | 4.8 | 4 | 2.3 | 1 | 12 | 1 |
| 32 | A 619 × A632 | 15 | 5.2 | 7 | 2.5 | 2 | 210 | 9 |
| 33 | A 619 × CH 539-9 | 33 | 5.9 | 12 | 3.6 | 13 | 5148 | 28 |
| 34 | A 619 × ND 481 000 | 36 | 7.2 | 21 | 6.1 | 27 | 20414 | 41 |
| 35 | A 619 × Oh 561 | 8 | 4.8 | 4 | 2.5 | 2 | 64 | 6 |
| 36 | A 619 × CH 592-13-2 | 37 | 6.1 | 14 | 4.1 | 17 | 8806 | 31 |
| 37 | CH 592-13-2 × A239 *33.6 | 16 | 4.4 | 2 | 2.3 | 1 | 32 | 2 |
| 38 | CH 592-13-2 × A632 | 23 | 5.1 | 6 | 3.1 | 8 | 1104 | 18 |
| 39 | CH 592-13-2 × | 41 | 6.2 | 15 | 4.1 | 17 | 10445 | 34 |
| 40 | CH 592-13-2 × ND481;000 | 28 | 6.9 | 20 | 5.6 | 25 | 14000 | 40 |
| 41 | CH 592-13-2 × Oh 561 | 7 | 5.2 | 7 | 3.3 | 10 | 490 | 12 |
| 42 | CH 592-13-2 × A 619; 000 | 40 | 6.4 | 14 | 4.2 | 18 | 12240 | 37 |
The best resistance to Fusarium stalk rot was found in the hybrids A239 × CH593-13-2 and CH593-3-2 × A239 (direct and reciprocal hybrid) with the average values equal to 4.3 and 4.4, and multiple index values equal to 40 and 32. Sensitivity to stalk rot and senescence is transmitted by ND-481. All hybrid combinations of this line (ND 481) have the highest multiple index values.
The best resistance to senescence was found in the hybrids A619 × A239 and CH593-13-2 × A239, with an average value equal to 2.3, and multiple index values of 12 and 32.
