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44

Evaluation of local and imported soybean accessions for soybean rust resistance in Vietnam

Presenter: T. N. Binh

All authors and affiliations: T. N. BINH (1), L. D. Tran (2), T. T. Tran (2), C. T. Nguyen (2), T. T. T. Nguyen (1), C. T. Luu (2), B. V. Vu (1), and H. T. Nguyen (1). (1) Plant Prot. Res. Inst. (PPRI), Acad. of Agric. Sci., Vietnam Acad. of Agric. Sci. (VAAS); and (2) Food Crop Res. Inst., VAAS

Soybean rust, one of the most aggressive diseases of soybean in Vietnam, can reduce yields up to 80%. To identify sources of resistance, 120 accessions were tested at PPRI, VAAS: 8 commercial varieties, 54 local accessions, 44 accessions imported from the Asian Vegetable Research Development Center (AVRDC), and 14 imported from the Commonwealth Scientific and Industrial Research Organization (CSIRO). Ten seeds each of four accessions were planted every 20 cm across 1-m-wide rows (with 10 cm of unplanted border at each row end), thinned to five plants per accession, and inoculated at V2. The experiment was repeated three times. Disease evaluation was done roughly 20 days after inoculation using a 14 scale: 1 (no lesions), 2 (1100 lesions), 3 (100500 lesions), and 4 (more than 500 lesions). Lesion type (RB-resistant, TAN-susceptible, or RB/TAN-mixed) was recorded and combined with lesion number to obtain a resistance rating. After two seasons, 18 accessions, including commercial varieties DT26, DT95, and DT96, and 5 local, 5 AVRDC, and 5 CSIRO lines, were identified as resistant (average rating less than or equal to the rating of the resistant check, DT2000). The net house method proved advantageous in that various maturity groups could be screened together using minimal space, time, and labor while correctly identifying resistance in soybean accessions.

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