Varietal improvement of soybean for downy mildew resistance
1996
Alongkorn Korntong
Varietal improvement of soybean was performed for resistance to downy mildew disease incited by the fungus Peronospora manshurica (Naoum.) Syd. Experiments were conducted during 1991 to 1994 at Srisamrong Field Crops Experiment Station, Sukhothai; Chiang Mai Field Crops Research Center, Chiang Mai; Nakhon Sawan Field Crops Research Center, Nakhon Sawan; and the Tropical Vegetable Research and Development Center, Kasetsart University, Kamphaeng Saen, Nakhon Pathom. The result revealed that BC1S1 progenies comprising 75 percent genetic background from a recurrent parent (Nakhon Sawan 1 or Sukhothai 1) and 12.5 percent from each of the two donor parents (DM 8032-1-9 or DM 8579-61-13 and Pudua 8008 B) were the same in all agronomic traits, between direct and reciprocal cross. While uniformity within each family varied depending on difference of the parental lines. In addition, the results from the yield testing of BC1S3 and BC1S4 revealed that line number 9201-8-S, 9202-24-S, 9202-32-S and 9206-52-C of Nakhon Sawan 1 group and 9209-71-S of the Sukhothai 1 group were not significantly different from recurrent parents in 10 traits studied. These selected lines were highly resistant to soybean downy mildew disease in the dry season at Sukhothai. Reaction to a set of 9 differential soybean lines showed that P. manshurica in major soybean planted area in Thailand comprised at least 3 physiological races, viz. the race found in Chiang Mai and Sukhothai in dry season, Nakhon Sawan and Sukhothai in late rainy season and Nakhon Pathom in late rainy season.
Afficher plus [+] Moins [-]Mots clés AGROVOC
Informations bibliographiques
Cette notice bibliographique a été fournie par Kasetsart University
Découvrez la collection de ce fournisseur de données dans AGRIS