Field resistance of crosses of sesame (Sesamum indicum L.) to charcoal root rot caused by Macrophomina phaseolina (Tassi.) Goid

Mohamed A. S. El-Bramawy and Omar A. Abdul Wahid
Additional contact information
Mohamed A. S. El-Bramawy: Agronomy Department, Faculty of Agriculture, Suez Canal University, Ismailia, Egypt
Omar A. Abdul Wahid: Botany Department, Faculty of Science, Suez Canal University, Ismailia, Egypt

Plant Protection Science, 2006, vol. 42, issue 2, 66-72

Abstract: Two segregating generations (F3 and F4) from 6 × 6 half-diallel crosses, excluding reciprocals, of a sesame breeding program were exposed to natural infection by the root rot pathogen (Macrophomina phaseolina) in two successive seasons (2004 and 2005). There was highly significant variability in the progeny of all investigated crosses which might be a valuable tool for further breeding programs for root rot disease management. The level of infection in 2004 ranged from 2.63% (cross P2 × P5) to 52.42% (P4 × P5) in the F3, and from 1.28% (P1 × P5) to 51.78% (P4 × P5) in the F4. During 2005, infection varied from 1.01% (P2 × P5) to 50.91% (P4 × P5) in the F3, and from 1.00% (P3 × P4) to 48.00% (P4 × P5) in the F4. These crosses were ranked resistant or highly susceptible and gave seed yields per feddan (= 4200 m) of 536.67, 361.67, 641.67, and 408.33, respectively. The F3's and F4's of five crosses, i.e. P1 × P2, P1 × P4, P1 × P5, P2 × P6, and P3 × P4, were resistant in both segregating generations and both seasons. Such crosses might be helpful for breeding programs due to their stable resistance. Lines from the crosses P1 × P6, P2 × P4 and P4 × P5 could also be used for improving resistance due to an increase of inherited resistance from one generation to another. The estimated heritability showed high values in all cases and indicated that selection for these traits could be useful for breeding programs for resistance to root rot with seed yield potential. Correlation coefficients showed that there were some positive correlations such as percentage of infection by M. phaseolina between both generations (F3's and F4's) as well as within each generation during a season's evaluation, i.e. 0.742, 0.976, 0.846, 0.732, and 0.987. The highest significant and positive correlations assisted in the selection of some crosses to be used in breeding programs and will aid breeders to achieve sesame cultivars with charcoal root rot resistance.

Keywords: sesame; root rot; Macrophomina phaseolina; disease resistance; seed yield; field conditions (search for similar items in EconPapers)
Date: 2006
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
http://pps.agriculturejournals.cz/doi/10.17221/2773-PPS.html (text/html)
http://pps.agriculturejournals.cz/doi/10.17221/2773-PPS.pdf (application/pdf)
free of charge

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpps:v:42:y:2006:i:2:id:2773-pps

DOI: 10.17221/2773-PPS

Access Statistics for this article

Plant Protection Science is currently edited by Ing. Eva Karská, (Executive Editor PPS)

More articles in Plant Protection Science from Czech Academy of Agricultural Sciences
Bibliographic data for series maintained by Ivo Andrle ().