EVALUATION OF MUNG BEAN GENOTYPES FOR RESISTANCE TO FIELD AND STORAGE DETERIORATION

Marwanto, Marwanto and Dhearma, Siburian and Marlin, Marlin (2007) EVALUATION OF MUNG BEAN GENOTYPES FOR RESISTANCE TO FIELD AND STORAGE DETERIORATION. JIPI, 3. pp. 328-336. ISSN 1411-0067

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Abstract

Humid tropical environments are very conducive to rapid seed deterioration in the field and in storage. The objectives of these studies were to (1) determine the role of mung bean seed coat characteristics on resistance to field and storage deterioration, and (2) to relate resistance to field deterioration with resistance to storage deterioration. Nine mung bean genotypes with different characteristics of seed coats were grown in research plots at Agriculture Faculty, Bengkulu University on November 2002 and subjected to (1) incubator weathering method to determine their difference in resistance to field deterioration for experiment 1, and (2) ambient storage method to determine their difference in resistance to storage deterioration for experiment 2. For each experiment, the treatment was arranged in a completely randomized design with three replications. After treated with incubator weathering and ambient storage methods, each genotype from each replicate was separately subjected to seed viability and vigor evaluation. The results showed that incubator weathering and ambient storage methods revealed their genotypic differences in resistance to field and storage deterioration respectively and the resistance was more attributed to seed coat permeability than seed size. The seed coat permeability, which was inversely related to seed coat lignin content (r = - 0.75 P<0.05), was correlated with the two seed quality indicators following incubator weathering and following ambient storage. For the incubator weathering, the correlation coefficient (r) between seed coat permeability with seed germination was – 0.70 (P<0.05) and with electrolyte conductivity was 0.75 (P<0.05). For ambient storage, the correlation coefficient (r) between seed coat permeability with seed germination was – 0.77 (P<0.05), and with electrolyte conductivity was 0.77 (P<0.05). A significant correlation was also observed between the two seed quality indicators following incubator weathering and following ambient storage. The correlation coefficient (r) between seed germination following incubator weathering and following ambient storage was 0.85 (P<0.05) and between electrolyte conductivity following incubator weathering and following ambient storage was 0.73 (P<0.05). This indicated that genotypes resistant to field deterioration as evaluated by the incubator weathering method were also resistant to storage deterioration as evaluated by the ambient storage method or vice versa and they were seeds of Bhakti and Gelatik.

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