TY - JOUR ID - 36170 TI - The influence of temperatures on germination and seedling growth of pyrethrum (Tanacetum cineraiifolium) under drought stress JO - International Journal of Advanced Biological and Biomedical Research JA - IJABBR LA - en SN - 2383-2762 AU - Shahrajabian, Mohamad Hesam AU - Khoshkharam, Mehdi AU - Zandi, Peiman AU - Sun, Wenli AU - Qi, Cheng AD - 1-Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China 2- Nitroegn Fixation Laboratory, Qi Institute, Building C4, No.555 Chuangye, Jiaxing 314000, Zhejiang, China AD - Department of Agronomy and Plant Breeding, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran AD - Institute of Environmental and Sustainable, Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China Y1 - 2020 PY - 2020 VL - 8 IS - 1 SP - 29 EP - 39 KW - Drought stress KW - germination KW - Pyrethrum KW - Seedling growth KW - Temperature DO - 10.33945/SAMI/IJABBR.2020.1.4 N2 - Pyrethrum is a perennial daisy grown commercially for the insecticide that is extracted from its flowers. In order to evaluate germination and seedling growth of pyrethrum under different temperature and drought stress treatments, an experiment was conducted in seed technology laboratory of Faculty of Agriculture of Islamic Azad University of Isfahan branch in 2018. During this experiment, polyethylene glycol (PEG) at 6 levels (0, -0.2, -0.4, -0.6, -0.8, -1.0 MP) and two temperature treatments (10oC and 15oC) were used. Two separate factorial trials, on the basis of absolute randomized design with three replications were used. Drought stress impact on germination percentage, mean time germination, shoot and root length, abnormal germination, germination uniformity, plumule dry and fresh weight, root dry and fresh weight and seed stamina index was significant. The influence of temperature was meaningful on germination percentage, mean time germination, shoot and root length, plumule dry weight, plumule fresh weight, root dry weight and root fresh weight. The rate of germination, germination percentage, as well as seedling growth and establishment were significantly lowered with the rise of stress levels using PEG. Control treatment and 15oC had obtained the highest germination percentage, mean time germination, shoot and root length, germination uniformity, plumule dry and fresh weight, root dry and fresh weight, and seed stamina index. Taking all traits into account, a clear understanding of the germination responses of seeds is useful in screening for tolerance of species to extreme temperatures. UR - https://www.ijabbr.com/article_36170.html L1 - https://www.ijabbr.com/article_36170_7dc164de39641cba9bf18a3232f45f2a.pdf ER -