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:: Volume 3, Number 2 ((Autumn & Winter) 2017) ::
IJSR 2017, 3(2): 129-141 Back to browse issues page
Cardinal Temperatures for Germination of Roselle (Hibiscus sabdariffa L.)
Seyyed Mahdi Javadzadeh, Parviz Rezvani Moghaddam *, Mohammad Banayan-Aval, Javad Asili
Professor Department of Agronomy, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran , Rezvani@um.ac.ir
Abstract:   (2415 Views)

Roselle is an important medicinal and industrial plant of the family of Malvaceae, and is planted in vast areas of Sistan and Baluchestan. In a laboratory study, the effect of varying temperatures on seed germination of Hibiscus sabdariffa was investigated and minimum, optimum and maximum temperatures for its germination were determined in a completely randomized design with four replications.  For this purpose, temperatures 5, 10, 15, 20, 25, 30, 35, 40, 45 and 50°C were considered in each treatment. Cardinal temperatures for germination were determined consistent with three models (i.e., Intersected-lines Model, Five-Parameters Beta Model and Quadratic Polynomial Model). The traits measured were germination percentage, speed of germination and mean germination time. The temperature effect on all the measured traits was significant. The results of the regression analysis showed that the best model in terms of cardinal point of this plant is the Five-Parameters Beta Model. Given the results of this model, the minimum and the optimal temperatures for the germination of Roselle are 4.04°C, and 29.83° C, respectively.

Keywords: Cardinal temperatures, Germination rate, Plant medicinal, Regression models
Full-Text [PDF 242 kb]   (512 Downloads)    
Type of Study: Research | Subject: Seed Ecology
Received: 2015/09/9 | Accepted: 2016/07/2 | Published: 2017/06/12
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Javadzadeh M, Rezvani Moghaddam P, Banayan-Aval M, Asili J. Cardinal Temperatures for Germination of Roselle (Hibiscus sabdariffa L.) . IJSR. 2017; 3 (2) :129-141
URL: http://yujs.yu.ac.ir/jisr/article-1-41-en.html
Volume 3, Number 2 ((Autumn & Winter) 2017) Back to browse issues page
مجله پژوهشهای بذر ایران Iranian Journal of Seed Research
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