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Genetic analysis of grain mold resistance in white seed sorghum genotypes

OAR@ICRISAT

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Relation http://oar.icrisat.org/5982/
http://dx.doi.org/10.1007/s10681-005-0534-6
 
Title Genetic analysis of grain mold resistance in white seed sorghum genotypes
 
Creator Audilakshmi, S
Stenhouse, J W
Reddy, T P
 
Subject Sorghum
 
Description Grain molds in rainy season sorghums can cause poor grain quality resulting in economic losses. Grain molds are a major constraint to the sorghum production and for adoption of the improved cultivars. A complex of fungi causes grain mold. Information on genetics of grain mold resistance and mechanisms is required to facilitate the breeding of durable resistant cultivars. A genetic study was conducted using one white susceptible, three white resistant/tolerant sources, and one colored resistant source in the crossing programme to obtain four crosses. P1, P2, F1, BC1, and BC2, and F2 families of each cross were evaluated for the field grade and threshed grade scores, under sprinkler irrigation. Generation mean analyses and frequency distribution studies were carried out. The frequency distribution studies showed that grain mold resistance in the white-grained resistance sources was polygenic. The additive gene action and additive × additive gene interaction were significant in all the crosses. Simple recurrent selection or backcrossing should accumulate the genes for resistance. Epistasis gene interactions were observed in colored resistance × white resistance cross. Gene interaction was influenced by pronounced G × E. Pooled analysis showed that environment × additive gene interaction and environment × dominant gene interaction were significant. The complex genetics of mold resistance is due to the presence of different mechanisms of inheritance from various sources. Evaluation of segregating population for resistance and selection for stable derivatives in advanced generations in different environments will be effective
 
Publisher Springer
 
Date 2005
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/5982/1/Euphytica_145_1-2_95-101_2005.pdf
Audilakshmi, S and Stenhouse, J W and Reddy, T P (2005) Genetic analysis of grain mold resistance in white seed sorghum genotypes. Euphytica, 145 (1-2). pp. 95-101. ISSN 0014-2336