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《Acta Ecologica Sinica》 2004-03
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Physiological and ecological responses of alfalfa and milkvetch seed to PEG priming

WANG Yan-Rong~(1,2), ZHANG Jian-Quan~1, LIU Hui-Xia~1, HU Xiao-Wen~1 (1.College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China; 2.College of Life Science, Nanjing Agricultural University, Nanjing 210095, China).  
Poor seedling emergence is one of the critical problems in grassland production in China.Osmotic polyethylene glycol (PEG 6000) priming technique (-0.6MPa, 24h) was used to study priming effects on seed germination and their physiological and ecological responses in different quality commercial seed lots of alfalfa (Medicago sativa) and milkvetch (Astragalus adsurgens). Results showed that PEG priming significantly enhanced (p0.05) early germination and germination index, and reduced time required for 30% seedling germination, but did not influence final germination. The priming effects varied according to species, seed lot and germination conditions. Positive effects were more evident on milkvetch than alfalfa; for instance, with similar medium quality seed lots of the two species, the time during which significantly increased germination occurred was up to 6 days in milkvetch, but only 4 days in alfalfa. The effect on medium quality seed lots (germination of 65%~77% for alfalfa and 58%~75% for milkvetch) was more evident than those on high (germination of 83% for alfalfa and 88% for milkvetch) or low quality (germination of 48% for alfalfa and 36% for milkvetch). In addition, the effect on germination under lower temperature (10℃) or drought conditions (-0.6MPa) germination media was more evident than that in optimum conditions. Malondialdehyde (MDA) content and electrical conductivity of seed soaking leaches (EC) of primed seeds were significantly lower (p0.01) than those of the control, and the values obtained indicated that MDA and EC of control seed was 3.3 and 3.2 times those of the primed seeds, respectively. The EC of seed re-dried for 24h after priming was equivalent to that of primed seed. Compared to control seed, water uptake rate of primed seed was significantly (p0.01) increased during early imbibition (0 to 30h), while during the imbibition before 24 and 72h, free sugar and proline contents of primed seeds were significantly increased (p0.05 for sugar and p0.01 for proline).
【Fund】: 国家自然科学基金资助项目 ( 30 1 70 6 72 );; 国家重点基础研究发展规划资助项目( G2 0 0 0 0 4 870 4)~~
【CateGory Index】: S540.1
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