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《Acta Prataculturae Sinica》 2006-05
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Effects of complex salt and alkali conditions on the germination of seeds of Puccinellia tenuiflora

YANG Chun-wu~1,JIANAER Ahan~2,SHI De-cheng~1,ZHANG Yan~1,YANG Ya-jun~1(1.School of Life Sciences,Northeast Normal University,Changchun 130024,China;2.Department of Biology,Chemistry and Environment Science,Yili Teachers College,Yili 835000,China)  
The stress conditions of salt-alkalinized soil were simulated to investigate the effects of alkali-saline mixed stress on the germination of seeds of Puccinellia tenuiflora.The features of salt-alkalinized soil in northeast China were simulated using 24 kinds of alkali-saline conditions with different salinities and pH obtained by mixing two neutral salts(NaCl and Na_2SO_4) and two alkalie salts(NaHCO_3 and Na_2CO_3) in various proportions.The seeds of P.tenuiflora were treated with the mixed salts and their germination rate and germination energy were investigated.The effects on germination of P.tenuiflora seeds of various mixed salts with different alkalinities were similar.Seed germination was delayed,and the germination rate,and speed of sprouting decreased as the salinity increased.The seeds did not sprout when the salinity was over 300 mmol/L.Statistical analysis showed that salinity was the dominant stress factor which inhibited the seed sprouting.At the stage of seed germination,water absorption was the key factor that determined whether the seeds did or did not sprout.Since salinity determined water absorption,it was a decisive factor while other indices,such as pH and buffer capacity were irrelevant to the water potential,as they had no decisive effect on germination.
【CateGory Index】: S156.4
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