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Tolerance of Industrial Hemp to Pb at the Stage of Seed Germination and Young Seedling Growth
Author(s): 
Pages: 97-104
Year: Issue:  6
Journal: Plant Fiber Sciences in China

Keyword:  industrial hempseed germinationPb toleranceSubordinate Function Methods;
Abstract: Effects of Pb stress on germination and young seedling growth of seven industrial hemp cultivars were tested,and a comprehensive evaluation of Pb tolerance of the seven cultivars was assessed using Subordinate Function Methods. Pb stress had no significant impact to germination potential and ger-mination ratio of seeds in the most cultivars,but the elongation of radicle and development of lateral roots were significantly inhibited by Pb stress. A low concentration of Pb2+showed that the trend of stimulation was obvious in shoot growth,while high concentrations of Pb2+had negative influence on shoot growth.Pb tolerance of the seven hemp cultivars were identified based on six indexes,including relative root/shoot ratio,relative root length,relative shoot length,relative number of lateral root,root tolerance index and shoot tolerance index under the stress of 600 mg/L Pb. Pb tolerance of the cultivars were classified into high of Qingma 1 ,Wanma 1 ,Bamahuoma and Yunwan 6 ,medium of Yunma 5 and Yumma 1 and low of Jinma 1 according to the weighed means of Subordinate Function values.
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