Selection of soybean rust tolerant lines and mechanism of soybean rust tolerance
1994
Peeranuch Saenaewong Na Ayutaya
Selection of tolerant soybean lines to soybean rust caused by Phakopsora pachyrhizi Syd. has been conducted. Relative yielding ability of F6 generation soybean lines obtained from crosses Cheiangmai60 * KUSL20004, Sukothail * OCB, Sukothail * KUSL20004 and Cheingmai60 * SJ.5 were evaluated under severe epidemic of soybean rust in 1992. The result indicated that there were 24 lines that exhibited yield over 300 kg/rai. Line 3501-3-2-1 exhibited the greatest yield of 402 kg/rai. The second ranked was line 3501-10-1-4 which yielded 386 kg/rai. Relative yielding ability under free - rusted of 24 selected F7 generation soybean lines were evaluated in dry season of 1993. The result stated that yield of 24 lines under free-rusted was higher than yield under severe rust epidemic. The calculation of tolerant index indicated that line 3502-124-5-1 exhibited the highest value of 0.97. The second ranked was line 3501-10-1-4 which tolerant index was 0.95. The tolerance components of soybean rust were investigated on 6 selected soybean lines by using detached leaf in the laboratory. The result indicated that line 3501-10-1-4 exhibited show rusting, the longest latent period of 16.4 days after inoculation, the lowest number of sorus, 4.3, per cm ** (2), the number of uredospore production was 850 spore/sorus and it also exhibited the longest penetration period of 6 days after inoculation. The result suggested that line 3501-10-1-4 was the most tolerance to soybean rust and the use of this tolerance line might be effective to reduce rate of epidemic.
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