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Author: search.filters.author.Sripichitt, Arom

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    Inheritance of field weathering resistance in soybean [Glycine max (L.) Merrill]
    (2010-05-01)
    Soe, Myint
    ;
    Sripichitt, Prapa
    ;
    Chanprasert, Wanchai
    ;
    Hongtrakul, Vipa
    ;
    Sripichitt, Arom
    A commercial variety of soybean, Chiangmai 60, which is susceptible to field weathering and two field weathering resistant varieties, GC 10848 and Kalitur, were grown and hybridized in the greenhouse at the Department of Agronomy, Kasetsart University. The F<inf>1</inf> hybrid seeds and their parental varieties were planted in the greenhouse to produce F<inf>2</inf> seeds. Parental varieties, F<inf>1</inf> hybrids and F<inf>2</inf> progenies were grown in an experimental field during the 2008 dry season at the National Corn and Sorghum Research Center, Pakchong District, Nakhon Ratchasima province. Individual plots were 3x3 m<sup>2</sup>, with six rows, composed of two rows of parents and four rows of F<inf>1</inf> hybrids or F<inf>2</inf> progenies for each cross. The spacing between rows was 50 cm and between hills was 25 cm. At physiological maturity, soybean pods were harvested, threshed and subjected to tests for accelerated aging (AA) and electrical conductivity (EC), and the seed coat percentage was measured. Field weathering resistance of the parental plants, F<inf>1</inf> hybrids and F<inf>2</inf> progenies was evaluated using germination percentages after AA testing and EC values of seed leachate and seed coat percentages. Dominance percentages of F<inf>1</inf> hybrids and the frequency distribution of F<inf>2</inf> progenies for the germination percentages after AA testing and EC values of seed leachate and seed coat percentages of the two soybean crosses revealed that field weathering resistance was controlled by a polygene with partial dominance.
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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.