Transgenic cotton cultivars BRS 430 B2RF and BRS 432 B2RF, medium and late season respectively, were developed by EMBRAPA in partnership with Bahia Foundation, aiming to create a high-yielding germplasm. The Bt toxins Cry1Ac and Cry2Ab target lepidopteran pests and the CP4-EPSPS gene confers tolerance to the herbicide glyphosate.
Key words:
Gossypium hirsutum; glyphosate tolerance; insect resistance; lint yield
| Counties/State | BRS 430 B2RF | FM 980 GLT (control) | PCC† | CV* | |||||
| CY (kg ha-1) | LP (%) | LY (kg ha-1) | CY (kg ha-1) | LP (%) | LY (kg ha-1) | CY | LY | ||
| Luís Eduardo Magalhães/BA | 4782 | 40.0 | 1913 | 4452 | 44.4 | 1977 | 7.4 | -3.2 | 10.7 |
| São Desidério/BA | 4277 | 41.3 | 1766 | 3681 | 43.4 | 1598 | 16.2 | 10.6 | 11.4 |
| Santo Antônio de Goiás/GO | 5519 | 40.1 | 2213 | 5034 | 44.8 | 2255 | 9.6 | -1.9 | 9.0 |
| Planaltina/DF | 4535 | 40.0 | 1814 | 3774 | 44.3 | 1672 | 20.2 | 8.5 | 13.1 |
| Sorriso/MT | 4476 | 39.8 | 1781 | 3899 | 43.5 | 1696 | 14.8 | 5.0 | 16.2 |
| Campo Verde/MT | 6432 | 40.0 | 2573 | 6294 | 45.6 | 2870 | 2.2 | -10.4 | 6.3 |
| Chapadão do Sul/MS | 3266 | 41.1 | 1342 | 2646 | 40.2 | 1064 | 23.4 | 26.2 | 15.4 |
| Uruçuí/PI | 3362 | 41.0 | 1378 | 2898 | 46.3 | 1342 | 16.0 | 02.7 | 10.8 |
| Mean | 4581 | 40.4 | 1848 | 4085 | 44.1 | 1809 | 13.7 | 4.7 | |
| Counties/State | BRS 432 B2RF | FM 980 GLT (check) | PCC† | CV* | |||||
|---|---|---|---|---|---|---|---|---|---|
| CY (kg ha-1) | LP (%) | LY (kg ha-1) | CY (kg ha-1) | LP (%) | LY (kg ha-1) | CY | LY | ||
| Luís Eduardo Magalhães/BA | 4737 | 40.5 | 1918 | 4452 | 44.4 | 1977 | 6.4 | -2.9 | 10.7 |
| São Desidério/BA | 4079 | 41.2 | 1680 | 3681 | 43.4 | 1598 | 10.8 | 5.2 | 11.4 |
| Santo Antônio de Goiás/GO | 5256 | 39.7 | 2087 | 5034 | 44.8 | 2255 | 4.4 | -7.5 | 9.0 |
| Planaltina/DF | 3960 | 41.0 | 1624 | 3774 | 44.3 | 1672 | 4.9 | -2.9 | 13.1 |
| Sorriso/MT | 4920 | 41.0 | 2017 | 3899 | 43.5 | 1696 | 26.2 | 18.9 | 16.2 |
| Campo Verde/MT | 6234 | 41.3 | 2575 | 6294 | 45.6 | 2870 | -1.0 | -10.3 | 6.3 |
| Chapadão do Sul/MS | 3084 | 41.8 | 1289 | 2646 | 40.2 | 1064 | 16.6 | 21.2 | 15.4 |
| Uruçuí/PI | 3393 | 42.1 | 1428 | 2898 | 46.3 | 1342 | 17.1 | 6.5 | 10.8 |
| Mean | 4458 | 41.1 | 1827 | 4085 | 44.1 | 1809 | 10.7 | 3.5 | |
| Traits | BRS 430 B2RF | BRS 432 B2RF | BRS 372 | FM 980 GLT |
|---|---|---|---|---|
| First flower (DAE)* | 50-55 | 55-60 | 60-65 | 60-65 |
| First open boll (DAE)* | 110-120 | 110-120 | 115-125 | 115-125 |
| Boll weight (g) a | 5.3 | 5.2 | 6.0 | 5.1 |
| Fiber length (UHML) (mm) a | 30.5 | 29.9 | 30.0 | 30.2 |
| Uniformity index (ML/UHML - %) a | 84.1 | 84.0 | 84.3 | 84.1 |
| Strength HVI (gf.tex-1) a | 30.7 | 30.2 | 30.6 | 30.3 |
| Micronaire reading a | 4.4 | 4.4 | 4.6 | 4.5 |
| Elongation (%) a | 6.3 | 6.7 | 6.3 | 6.2 |
| Reflectance - Rd (%) a | 81.0 | 80.0 | 80.9 | 80.2 |
| Yellowness (+ b) a | 7.6 | 7.7 | 7.7 | 7.7 |
| Short fiber index (%) a | 6.8 | 7.2 | 7.0 | 6.7 |
| Cotton leafroll dwarf virus (CLRDV) b | 0.0 | 0.0 | 0.0 | 0.0 |
| Atypical form of CLRDV cd | 3.0 | 2.0 | - | 3.0 |
| Ramularia leaf spot d | 2.5 | 3.0 | 1.0 | 3.0 |
| Bacterial blight d | 1.0 | 1.0 | 1.0 | 1.0 |
| Ramulosis e | 0.42 | 0.51 | 1.0 f | 0.57 |
