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Author: search.filters.author.Juntakool, SunantaHas files: No

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    Modifying controlled deterioration for evaluating field weathering resistance of soybean
    (2007-04-01)
    Changrong, Ye
    ;
    Sripichitt, Prapa
    ;
    Juntakool, Sunanta
    ;
    Hongtrakul, Vipa
    ;
    Sripichitt, Arom
    To develop practical methods for testing field weathering resistance of soybean varieties, pods and seeds from CM60 (susceptible) and GC10981 (resistant) were tested by seven treatments. Among the treatments, modified incubator weathering (yellow pods were incubated at 300C under 90-100% relative humidity for 7 days) and the controlled deterioration (dry seeds were soaked in distilled water for 60 minutes and then incubated at 41°C under 90-100% relative humidity for 3 days) showed wide-range differences in seed germination and viability between CM60 and GC10981. These two treatments were then tested on 11 soybean varieties comparing with a field weathering treatment. The germination of seeds treated by controlled deterioration was highly correlated to the germination of seeds subjected to field weathering treatment (r=0.964**, n=11). The viability of seeds submitted to both incubator weathering and controlled deterioration were also correlated to the viability of seeds exposed to field weathering (r=0.697* and 0.716*, n=11). The modified incubator weathering and controlled deterioration methods were further used to evaluate the field weathering resistance of 139 F <inf>2</inf> progenies derived from the cross CM60/GC10981. There was a significant correlation between the incubator weathering and the controlled deterioration by considering the germination and viability of seeds (germination r=0.331**, viability r=0.425**, n=139). Both the modified incubator weathering and controlled deterioration were efficient for evaluating the field weathering resistance of soybean varieties. Particularly, controlled deterioration method was found to be a useful way for evaluating the field weathering resistance of soybean seeds.
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    Breeding of soybean (Glycine max (L.) Merrill) for field weathering resistance by pedigree method
    (2006-04-01)
    Thanh, Phan Thi
    ;
    Sripichitt, Prapa
    ;
    Wongyai, Wasana
    ;
    Juntakool, Sunanta
    ;
    Sripichitt, Arom
    Breeding of soybean for field weathering resistance was conducted by hybridization between commercial variety CM60 which is susceptible to field weathering and two field weathering resistant varieties (GC2796 and SJ1) in 2003. The F<inf>1</inf> hybrid plants were grown in the greenhouse at the Department of Agronomy, Kasetsart University and the F<inf>2</inf> to F <inf>4</inf> progenies were planted in the field at National Corn and Sorghum Research Center, Nakhon Ratchasima province. Field weathering resistance of soybean was evaluated from some seed characteristics involving seed germinability after accelerated aging, seed vigor estimated from the electrical conductivity of seed leachates, percentage of seed coat and seed coat thickness. Selection was done in each succeeding generation from F<inf>2</inf> to F <inf>4</inf> using pedigree method for plants/lines which had high seed germinability and vigor, high percentage and thickness of seed coat and good agronomic characters. The yield trial of 17 F<inf>5</inf> lines was performed at National Corn and Sorghum Research Center in rainy season 2005. Six F <inf>5</inf> lines having high seed yield, field weathering resistance and good agronomic characters were selected. These promising lines will be further evaluated for seed yield, field weathering resistance and agronomic performance in different locations.
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