Genetic Variation in Morphophysiological Characters of Seeds of Ceratoides arborescens,a Species Endemic to China

不同种源华北驼绒藜种群种实特征变异性研究(英文)

[Objective] The research aimed at investigating the variation in morpho-physiological characteristics of Ceratoides arborescens seeds from Inner Mongolia grassland.[Method] The seeds of six wild C.arborescens populations were collected from Siwangziqi,Xilinhaote,Keshiketengqi and Wengniuteqi in Inner Mongolia grassland;then a total of eight indicators of seed morphology and germination traits were determined,respectively.[Result] There was wide variation in seed traits among different populations of C.arborescens.The variation within the populations was higher than that among the populations,which meant that C.arborescens had a strong adaptability to environment pressure.The seed traits shared a significant positive correlation with each other（r0.931,P0.01）.The three germination-related indices including seed germination rate,germination index,vitality index had significant positive correlations with each other（r 0.836,P0.01）and with seed setting rate（r0.896,P0.01）,but shared weak correlations with morphological traits.There were significant correlations between pappus length and longitude,rainfall,as well as between seed width and temperature,rainfall（r0.801,P0.01）.[Conclusion] The research will provide reference for the seed breeding and collection of germplasm resource.We suggest that collecting seeds from various individuals from each populations will be the preferred strategy to initiate plant improvement program of the species and for gene conservation in seed banks.

[目的]研究中国特有植物种——华北驼绒藜(Ceratoides arborescens)种群种实特征变异性。[方法]采集内蒙古四子王旗、锡林浩特、克什克腾旗和瓮牛特旗4个旗县6个野生种群的华北驼绒藜种子,分别测定其种子形态和萌发特征的8个指标。[结果]华北驼绒藜种子各性状在种群内存在广泛的变异性,其种群内的变异性大于种群间,表明华北驼绒藜种子性状受到较强的遗传控制。种子形态性状间有较好的相关性(r>0.931,P<0.01),种子发芽率、发芽指数和活力指数间有显著相关性(r>0.836,P<0.01)与结实率也有显著相关性(r>0.896,P<0.01),与形态性状有弱的相关性。种子形态和萌发特征与地理气候因子相关性表现为,种子背毛长与经度、降雨量,种子宽与温度、降雨量有显著相关(r>0.801,P<0.01)。[结论]该研究为育种和种质资源收集提供了重要的理论参考数据,建议在开展育种和种质资源研究时,种子收集应从不同种群,特别是不同单株进行。