Effects of planting date and accelerated aging on seed germination-related traits of lipoxygenase-lacking soybean

2002

A:PS

Lower field germination was observed in lipoxygenase-lacking soyabean genotypes. This study was performed to understand seed-related traits after accelerated aging in response to sowing date of soyabeans. Two soyabean cultivars, Jinpumkong (null lipoxygenase-2, 3) and Jinpumkong 2 (lacking lipoxygenase-1, 2, 3), were evaluated for germination, and were compared with cv. Taekwangkong containing lipoxygenase-1, 2, 3 isoenzymes. Greater seed coat cracking was observed in Jinpumkong and Jinpumkong 2 than in Taekwangkong. Regardless of soyabean genotypes, earlier sowing resulted in greater seed coat cracking. After accelerated aging, seed fracturability and hardness of Jinpumkong and Jinpumkong 2 were lower than those of Taekwangkong. There was significant difference in germination percentage among soyabean genotypes in response to sowing date. Seeds obtained from late sowing showed better germination ability. Accelerated aging resulted in lower germination percentages of Jinpumkong and Jinpumkong 2 than that of Taekwangkong, and showed higher electric conductivity in Jinpumkong and Jinpumkong 2 than in Taekwangkong. After accelerated aging at 40? for 35 days, germination percentages of Jinpumkong and Jinpumkong 2 were lower than that of Taekwangkong. Electric conductivity was increased continually as accelerated aging time became longer, and Jinpumkong and Jinpumkong 2 showed higher electric conductivity than Taekwangkong. Even though there were significant genotype differences in seed traits, further studies are needed to determine whether seed lipoxygenase ability is associated with germination ability.

v.47(3):196-200, KOREAN JOURNAL OF CROP SCIENCE

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