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Author: search.filters.author.Sripichitt, AromSubject: search.filters.subject.Soybean

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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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    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.