Drought-resistance Comparison of Two Widely Planting Garden Plants During Seed Germination of Yinchuan City
In order to compare the drought‐resistance of Aster novi‐belgii with Dianthus chinensis cv .American during seed germinating period ,two experimental materials were studied under drought stress simulated by 1/2Hoagland solution having different concentration of PEG‐6000 .The results showed that :The total germina‐ting rate of Aster novi‐belgii and Dianthus chinensis cv .American reached maximum point 84% and 83 .3%corresponding to 5% treatment ,and the total germinating rate of Aster novi‐belgii and Dianthus chinensis cv . American decreased with the increasing content of PEG‐6000 .Three characteristic values including the embryo bud length ,the fresh weight and vigor index of two plants all decreased with the increasing of PEG‐6000 con‐tent ,the embryo root length reached maximum when the concentration of PEG‐6000 equaled to 10% ,then de‐creased gradually .The drought resistance index of Aster novi‐belgii reached highest point 1 .214 corresponding to 5% treatment ,while the drought resistance index of Dianthus chinensis cv .American descended from 1 .000 to 0 .048 .The membership function was used to calculate the membership values of the total germinating rate , the embryo bud length ,the embryo root length ,the fresh weight ,vigor index and drought resistance index for assessing drought‐resistent ability of two plants comprehensively ,the total average membership value was 0 .379 and 0 .398 ,therefore ,the the drought‐resistance of Dianthus chinensis cv .American was higher than As‐ter novi‐belgii .
water saving greendrought-resistancemembership functionseed germination
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