Determination of the best model to evaluate germination cardinal temperature of Silybum marianum as a medicinal plant

Document Type : Original Article

Abstract

In order to evaluate cardinal temperatures of milk thistle (Silybum marianum)germination an experiment was carried out in the laboratory of Plant Production College, Gorgan University Agricultural Science and natural resources. Seven temperatures in a completelyrandomized design with four replications was used. Temperatures were 5 to 35ºC by 5ºC intervals. The seeds with 2 mm radicles were counted as germinated seeds.The germination rate percentage and cumulative seed germination percentage were calculated for each given temperatures.Cardinal temperatures (T-base, T-optimum and T-ceiling), also, were estimated using eight non linear regression models. The effect of temperature on total germination percentage, time to 50% germination (D50) and germination rate based on 1/D50 and mean germination time inverse (1/MGT) was significant at 1% of probability level. Results indicated that by increasing temperature up to 15ºC germination increased and after that declined. Based on the highest R² and the lowest MAE and RMSE segmented model was determined as the superior model. Thus, Tb, To and Tc for D50 (time to %50 germination) were estimated as 2.75, 31.51 and 38 using segmented model.To calculate germinationrate 1/D50 index was better than 1/MGT due to higher regression coefficient and less RMSE.

Keywords

References

Adam, N.R., Dierig, D.A., Coffelt, T.A., and M.J. Wintermeyer. 2007. Cardinal temperatures for
germination and early growth of two Lesquerella species. Indian Journal of Crops and Production, 25: 24-33.
Alvarado, V., and K.J. Bradford. 2002. A hydrothermal time model explains the cardinal temperature for
seed germination. Plant cell and Environment, 25:1061-1069.
Balandari, A., Rezvani Moghaddam, P., and M. Nassiri Mahallati. 2011. Cardinal temperatures for seed
germination of Cichorium pumilum Jacq. Second Congress of Seed Science and Technology, Mashhad, Iran.
Bannayan, M., Nadjafi, F., Rastgoo, M., and L. Tabrizi. 2006. Germination properties of some wild
medicinal plants from Iran. Journal of Seed Technology, 28: 80-86.
Blackshow, R.E. 1991. Soil temperature and moisture effects on downy brome Vs. winter canola, wheat and
ray emergence. Crop Science, 31: 1034 – 1040.
Bradford, K. J. 2002. Application of hydrothermal time to quantifying and modeling seed germination and
dormancy. Weed Science, 50: 248-260.
 
Colbach, N. B. Chauvel, C. Durr, and G. Richard. 2002. Effect of environmental conditions on
Alopecurus myosuroides germination. I. Effect of temperature and light. Weed Research, 42:210-221.
Copeland, L. O., and M. B. McDonald. 1995. Principles of seed science and technology. Chapman & Hall.
409 pp., USA.
Ghavami, N., and A. A. Ramin. 2007. Salinity and temperature effects on seed germination of Milk Thistle.
Communications in Soil Science and Plant Analysis, Vol: 38: 2681-2691.
Hardegree, S. 2006. Predicting germination response to temperature. I. Cardinal temperature models and
subpopulation-specific regression. Annual Botany, 97:1115-1125.
Hardegree, S.P., and A.H. Winstral. 2006. Predicting germination response to temperature. II. Threedimensional
regression, statistical gridding and iterative-probit optimization using measured and
interpolated-subpopulation data. Annual Botany, 98:403-410.
Jacobsen, S.E., and A.P. Bach. 1998. The influence of temperature on seed germination rate in quinoa
(Chenopodium quinoa Wild). Seed Science and Technology, 26: 515-523.
Jami Al-Ahmadi, M., and M. Kafi. 2007. Cardinal temperatures for germination of Kochia scoparia (L.).
Journal of Arid Environment, 68: 308–314.
Jordan, G. L., and M. R. Haferkamp. 1989. Temperature responses and calculated heat units for
germination of several range grasses and shrubs. Journal of Range Management. 42: 41-45.
Kamkar, B., Ahmadi, M., Soltani, A., and E. Zeinali. 2008. Evaluation non-linear regression models to
describe a response of wheat emergence rate to temperature. Seed Science and Biotechnology, 2: 53-57.
Kamkar, B., Koocheki, A., Nasiri Mahallati, M., and M.P. Rezvani Moghdam. 2005. Cardinal
temperatures for germination in three millet species (Panicum miliaceum, Pennisetum glaucum and Setaria
italica). Asian Journal of Plant Science 5: 316–319.
Kamkar, B., Jami Al-Ahmadi, M., Mahdavi-Damghani, A. and F. J. Villalobos. 2012. Quantification of
the cardinal temperatures and thermal time requirement of opium poppy (Papaver somniferum L.) seeds to
germinate using non-linear regression models Industrial Crops and Products, 35 (1): 192-198
Kamkar, B. 2011. GS_2011. A Pocket Software to calculate germination and emergence indices. GUASNR.
Khan, M., Gul, A., and, D.J. Weber. 2001. Influence of salinity and temperature on germination of Kochia
scoparia. Wetlands Ecology Management 9, 483-489.
Mahmoodi, A., Soltani, E. and H. Barani. 2008. Germination response to temperature of snail medic
(Medicago scutellata L.). E. Jour. Crop Production, Vol. 1 (1), 54-63.
Nadjafi, F., Tabrizi, L., Shabahang, J. and A. M. Mahdavi Damghani. 2009. Cardinal germination
temperatures of some medicinal plant species. Seed Technology, 31(2): 156-163.
Naghedinia, N., and P. Rezvani Moghaddam. 2009. Investigations on the cardinal temperatures for
germination of Crambe kotschyana.. Jouranl of field crop Research, Vol: 7 (2), 451-456.
Phartyal, S.S., Thapliyal, R.C., Nayal, J.S., Rawat, M.M.S., and G. Joshi. 2003. The influencesof
temperature on seed germination rate in Himalayan elm (Ulmus wallichiana). Seed Science and Technology,
31:83–93.
Pourreza, J., and A. Bahrani. 2012. Estimating cardinal temperatures of milk thistle (Silybum marianum)
seed germination. American-Eurasian Journal Agriculture and Environmental Science, 12 (11): 1485-1489.
Ramin, A. A. 1997. The influence of temperature on germination of taree Irani (Allium ampeloprasum L.
spp. iranicum W.). Seed Science and Technology. 25:419-426.
Sabouri Rad, S., Kafi, M., Nezami, A., and M., Bannayan Aval. 20 11. Germination behavior of Kochia
scoparia in response to temperature and Salinity. Journal of Agroecology , 4(4): 282-293. (In Persian with
English Summary)
Saeidnejad, Kafi, M., and M. Pessarakli. 2012. Evaluation of cardinal temperatures and germination
responses of four ecotypes of Bunium persicum under different thermal conditions. International Journal of
Agriculture and Crop Sciences, 4 (17): 1266-1271.
Tabrizi, L., Koocheki, A., Nassiri Mahallati, M., and P. Rezvani Moghaddam. 2008. Germination
behaviour of cultivated and natural stands seeds from of Khorasan Thyme (Thymus transcaspicus Klokov)
with application of regression models. Iranian Journal of Field Crops Research. 5 (2): 249-257.
Iranian Journal of Seed Science and Technology
Volume 3, Issue 2 - Serial Number 6
December 2014
Pages 189-200

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