两种三叶草萌发期和幼苗期抗性的比较研究

通过测定不同的温度、水分、盐分和光照等条件下，杂三叶和地三叶(考拉)在萌发期和幼苗期的发芽率、发芽势、生长速度、叶绿素含量、组织含水量、脯氨酸含量和细胞膜透性等指标，对两者抗性进行了比较研究。结果表明，在不同盐分浓度处理下，三叶草的叶绿素含量随盐浓度的增加而降低，组织含水量变化不明显，游离脯氨酸含量随盐浓度的增加而增加，细胞膜透性随盐浓度的增加而增强；在不同水分条件处理下，三叶草的游离脯氨酸含量和细胞膜透性随水分的增加而增加，叶绿素含量和组织含水量均变化不明显；在不同光照时间处理下，三叶草的叶绿素含量和游离脯氨酸含量均变化不明显，其细胞膜透性也无较大改变，而组织含水量则随光照时间的增加而增加;在不同温度条件下处理，三叶草的叶绿素含量、组织含水量和游离脯氨酸含量均变化不明显，细胞膜透性随温度的升高而降低。另外，从各项测定结果可以看出，杂三叶的各项性状要强于地三叶。

The Comparative Study on Stress Resistance of two Trifolium Varieties at the Germination Period and the Seeding Stage

The paper studies the stress resistance of two Trifolium varieties(Trifolium hybridum L. and T. subterraneum L.)under different conditions of environmental stress. The result indicated that, under the stress of different salinities processing, the chlorophyll content of Trifolium reduces with the salinity increase, the tissue water content has no obvious change, the content of free-proline increases with the salinity increase, the permeability of cell membrane in leaf blade goes up with the salinity increase. Under different water regimes, the permeability of cell membrane and the content of free-proline of Trifolium increases along with the moisture content increase, the chlorophyll content and the tissue water content have no obvious change. Under different illu mination schemes, the chlorophyll content, the tissue water content and the content of free-proline of Trifolium have no obvious change, the permeability of cell membrane reduces with the daylight length increase. Under the stress of different temperature, the chlorophyll content, the tissue water content and the content of free-proline of Trifolium have no obvious change, the permeability of cell membrane reduces with the temperature increase. Otherwise，the stress resistance of T. hybridum L. is better than that of T. subterraneum L.