Effects of Temperature Stratification on Seed Germination and Seedling Emergence of Polygonatum

doi:10.7668/hbnxb.20191379

Abstract

Abstract: Mature Polygonatum sibiricum seed's embryos are underdeveloped.After falling in autumn under natural conditions,the seeds undergo a brief high temperature condition in autumn and then enter a low temperature period in winter.We simulated this natural condition of the seed,and set three temperature-variable lamination treatments(30/20℃,25/15℃,20/10℃)and one low temperature 4℃ treatment.The germination characteristics of Polygonatum sibiricum Red., P.cyrtonema Hua.and P.kingianum Coll.et Hemsl.seeds were studied.The results showed that the optimal germination temperature of the three seeds under constant temperature was 25℃,and the seed germination rate was the highest.The optimal temperature for germination of P.sibiricum Red.and P.kingianum Coll.et Hemsl.was 30/20℃,and the optimal temperature for germination of P.cyrtonema Hua.was 20/10℃,and the germination rate of the seeds reached the maximum under the corresponding variable temperature conditions.The germinated seeds were then transferred into two batches at room temperature of 25℃ and low temperature of 4℃ for emergence studies.Among them,there was a dormancy condition of the P.sibiricum Red.seeds,which need to be treated at a low temperature of 4℃ for emergence,while the P.cyrtonema Hua.and P.kingianum Coll.et Hemsl seeds can emerge directly. P.cyrtonema Hua.is suitable for emergence at low temperature,and P.kingianum Coll.et Hemsl.is more suitable for emergence at normal temperature.

Key words: Polygonatum sibiricum, Temperature stratification, Seed germination, Dormancy, Emergence

CLC Number:

S567.01

AN Ruipeng, WANG Dongmei, QI Jianjun, WEI Jianhe, LIAO Dengqun. Effects of Temperature Stratification on Seed Germination and Seedling Emergence of Polygonatum[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2020, 35(S1): 220-226. doi: 10.7668/hbnxb.20191379.

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