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《Acta Agrestia Sinica》 2017-04
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Factors that Affect Seed Germination of Poisonous Grass-Oxytropis ochrocephala

CHEN Chao;DING Dan;WANG Qing-hai;WU Ju-ying;MO Chong-hui;Beijing Research and Development Center for Grass and Environment;College of Agriculture and Animal Husbandry,Qinghai University;  
To understand the germination characteristics of yellow-hair crazyweed(Oxytropis ochrocephala),different temperatures and pregermination treatments were conducted to study the factors that affect seed germination.The results showed that temperature was the most significant factor germination.From10℃to 25℃,seed germination rate increased with temperature,with the highest germination rate of15.3%in 25℃,and the lowest germination rate of 1.3%in 10℃/5℃.Anyhow,germination rate was significantly higher under the condition of constant temperature than that of the corresponding treatments with low temperature in night.With temperature rising,the vigor index of yellow-hair crazyweed was also increased,and the initiatory time of seed germination was shortened and the hard seed rate was decreased.In 10℃/5℃,the vigor index was the lowest of 0.05,with the initiatory time of seed germination of 22.3 d and the hard rates of 97.2%.The influence of pregermination treatments on seed generation was related to temperature.In constant temperature of 25℃/5℃,seed vigor index was significantly improved under seed soaking in cold water,and it also shortened the initiatory time of seed germination;while the germination rate was significantly increased under seed soaking at variable temperature of 10℃.However,the seed germination rate,vigor index,initiatory time of seed germination and hard seed rate were at the same level in other temperatures.Thus,the yellow-hair crazyweed may have little opportunity of quick establishment in alpine grassland,where it has a lower average annual temperature and dramatic temperature fluctuations between days and nights.
【Fund】: 公益性行业(农业)科研专项(201203062)资助
【CateGory Index】: S812.6
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