|Abdullaev, Alisher - Uzbekistan Institute Of Genetics|
|Salahutdinov, Ilhom - Uzbekistan Institute Of Genetics|
|Kuryazov, Zarif - Uzbekistan Institute Of Genetics|
|Egamberdiev, Sharof - Uzbekistan Institute Of Genetics|
|Rizaeva, Sofia - Uzbekistan Institute Of Genetics|
|Abdurakhmonov, Ibrokhim - Uzbekistan Institute Of Genetics|
Submitted to: World Cotton Research Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 7/16/2011
Publication Date: 11/7/2011
Citation: Abdullaev, A., Salahutdinov, I., Kuryazov, Z., Egamberdiev, S., Rizaeva, S., Ulloa, M., Abdurakhmonov, I. 2011. Study on Fusarium wilt disease (F. oxysporum vasinfectum) in Upland cotton (G. hirsutum). World Cotton Research Conference 5, November 7 to 11, 2011, Mumbai, india. Presentation No. 198.
Technical Abstract: In Uzbekistan, Upland cotton (Gossypium hirsutum L.) has been increasingly affected by the Fusarium wilt disease [Fusarium oxysporum vasinfectum (FOV)] during the last couple of years. This disease significantly reduces cotton yields. A highly virulent strain of FOV (No. 316) has been isolated from infected Upland cottons grown in Uzbekistan. FOV resistance in G. hirsutum was studied using Uzbekistan cultivars, and germplasm from the Uzbek cotton germplasm collection. Eighteen accessions were selected from the collection with different levels of FOV resistance (10 resistant and 8 susceptible) according to Uzbek collection archive data. We developed experimental populations from 21 parent-crossing combinations from these selected accessions. Only two experimental populations (cvs Mebane B1 x cvs 11970, cvs DPZ554085 x cvs Duli) of the 21 parent-crossing combinations showed significant progeny-segregation for FOV resistance. The rest of the populations were highly susceptible to strain No. 316 of FOV. Plant survival (PS) tests of these two populations and control plants were conducted under two environments: artificial (Environment 1) and natural (Environment 2) FOV infestation. Results of the PS tests showed greater inhibition of seed germination by FOV No. 316 under Environment 2 (21 - 35 %) than Environment 1 (2 - 3 %) in both F3 populations. The FOV symptoms on progeny of Mebane B1 x 11970 varied between environments, with FOV symptoms observed on 45% (81) of plants in Environment 1 on 79% (115) of plants in Environment 2. These results indicate that FOV No. 316 is highly virulent against Upland cottons because selected G. hirsutum accessions with known resistance to FOV were susceptible to strain No. 316 of FOV. Analysis of segregating F3 progeny from the two populations showed that FOV resistance in Upland cotton is controlled by at least one major gene, and virulence of FOV No. 316 was highly dependent on environment.