Anthracnose disease response in the Burundi sorghum germplasm collection

Abstract

The United States National Plant Germplasm System maintains 151 sorghum accessions from Burundi of which 148 accessions were evaluated for resistance to Colletotrichum sublineolum at the Tropical Agriculture Research Station in Isabela, Puerto Rico in replicated evaluations during the 2007 and 2008 growing seasons. For the 2007 experiment, 120 accessions showed a resistant response with 89 of these accessions rated as resistant in 2008. The resistant accessions showed reddening of inoculated leaves with no acervuli development, whereas accessions rated as susceptible showed acervuli development on inoculated leaves. Mean infection severity based on the percentage of infected leaf area for the susceptible accessions was 2% in 2007 and 2.5% for the 2008 experiment. Only four accessions showed an infection severity more than 10% and eight accessions showed a susceptible response across replications and growing seasons. Results of this study indicate that sorghum germplasm from Burundi is an important source of anthracnose resistance for sorghum improvement and that germplasm from regions of high annual rainfall is frequently associated with anthracnose resistance.

Anthracnose field evaluation of sorghum germplasm from Botswana

“…Resistance can be inherited as a qualitative or quantitative trait (Mehta et al 2005;Mohan et al 2010) and extensive variation in disease response has been observed in populations developed to determine the genetics of resistance (Erpelding 2007); therefore, the diversity Numbers followed by the same letter were not significantly different at the 5% probability level 2 Disease severity for the susceptible accessions from the Ngamiland and Kgatleng was significantly different at the 10% probability level in disease response and overall lower disease severity would suggest genetic variation for host resistance. Additionally, quantitative resistance resulting in lower disease severities is frequently observed in sorghum landraces and disease response often shows regional specificity (Erpelding 2008(Erpelding , 2010Erpelding & Prom 2004) as was observed for the accessions from Botswana.…”

Assessment of sorghum genetic resources of Ethiopia for anthracnose (Colletotrichum sublineolum Henn.) resistance and agronomic traits

“…Disease infection and development is the highest in tropical and subtropical regions where high temperatures and humidity are common (Burrell et al, ; Crouch & Beirn, ; Marley, Diourte, Neya, & Rattunde, ; Mathur, Thakur Neya, Marley, & Casela, ; Mehta et al, ; Ngugi, King, Abayo, & Reddy, ; Patil et al, ). Sorghum anthracnose is widely reported in East Africa, including Kenya, Uganda and Ethiopia (Erpelding, ; Sserumaga, Biruma, Akwero, Okori, & Edema, ; Were & Ochuodho, ). In Ethiopia, the disease is one of the most important sorghum production constraints (Chala, Alemu, Prom, & Tronsmo, and Chala, Brurberg, & Tronsmo, ).…”

“…. Sorghum anthracnose is widely reported in East Africa, including Kenya, Uganda and Ethiopia (Erpelding, 2010;Sserumaga, Biruma, Akwero, Okori, & Edema, 2013;Were & Ochuodho, 2012). In Ethiopia, the disease is one of the most important sorghum production constraints (Chala, Alemu, Prom, &.…”