Germination and Emergence Ecology of Thymus vulgaris and Thymus daenensis

Ehsan Zeidali, Shahrani Dehghan, Fereshteh Darabi

Abstract


Understanding the germination of medicinal plants to develop long-term strategies of their management can be useful. In sowing these plants, due to the high sensitivity of their seed germination, it needs to the comprehensive information on how to grow and make desirable seedbed to germination. In order to understand some ecological characteristics of Thymus vulgaris and T. daenensis, Factorial experiments carried out in a Randomized complete-block design with four replications at Islamic Azad University of Shahrekord in 2015. Effect of temperature on seed germination were evaluated in germinator under night/day fluctuating temperatures (5/15, 10/20, 15/25, 15/30 and 20/35° C), effect of salinity by using NaCl solutions (0, 10, 20, 40, 80, 160 and 320 mM) and acidity effect by using buffer solutions with adjusted pH 5 to 9. To study the effect of seed planting depth on seedling emergence, seeds were buried at different depths (0, 1, 2, 3 and 4 cm). Results showed that the effect of different temperatures on percentage, speed and time to reach 50% of maximum germination in relation to the both varieties were not significant. Germination percentage of T. vulgaris related to alternating temperatures 15/25° C night/day was by 96% during the day and the lowest germination belonged to 20/35° C by 37% and 0% respectively during the day and night. The highest germination percentage of T. daenensis was in 20/35° C by 93% in day, but other temperatures of seed germination belong to this plant was relatively acceptable. Increasing salinity reduced germination of both species. General emergence decreased with increasing planting depth. Acidity treatments had significant effect on germination. Minimum and maximum germination of T. vulgaris were observed at pH 9 and 7 up to 20% and 93%, respectively. The highest and lowest germination percent of T. daenensis were at pH 7 and 9 up to 94% and 19%, respectively.

 

Keyword:  Acidity, Germination Temperature, Planting Depth, Thymus daenensis, Thymus vulgaris


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Ahmadi, A., Hosseini, M., Zeidali, E., 2013. Study of ecological characteristics of canary grass (Phalaris minor). Technical Journal of Engineering and Applied Sciences, 3 (16): 1835-1840.

Almansouri, M., Kinet, J. M., Lutts, S., 2001. Effect of salt and osmotic stresses on germination in durum wheat (Triticum durum Desf.). Plant Soil, 231: 243-254.

Atak, M., Kaya, M. D., Kaya, G., Cikili, Y., Ciftçi, C. Y., 2006. Effects of NaCl on the germination, seedling growth and water uptake of triticale. Turkish Journal of Agricultural and Forestry, 30: 39-47.

Baskin, J. M., Baskin, C. C., 1983. Seasonal changes in the germination responses of Arabidopsis thaliana and ecological interpretation. Botanical Gazette, 144: 540-543.

Baskin, C. C., Baskin, J. M., 1998. Ecology of seed dormancy and germination in grasses. In Population Biology of Grasses, (Eds.). Cheplich, G. P. pp. 30–83. Cambridge, UK: Cambridge University. Press.

Benvenuti, S., 2003. Soil texture involvement in germination and emergence of buried weed seed. Agronomy Journal, 95: 191-198.

Chachalis, D., Ready, K. N., 2000. Factors affecting Campsis radicans seed germination and seedling emergence. Weed Science, 48: 212-216.

Chauhan, B. S., Gill, G., Preston, C., 2006. Factors affecting seed germination of three-horn bedstraw (Galium tricornutum). Weed Science, 54: 471-477.

Chauhan, B. S., Johnson, D. E., 2008. Seed germination and seedling emergence of Nalta Jute (Corchorus olitorius) and Redweed (Melochia concatenate). Important broadleaf weeds of the tropics. Weed Science, 56: 814-819.

Corticchiato, M., Tomi, F., Bernardini, A. F., Casanova, J., 1998. Composition and infraspecific variability of essential oil from Thymus herba barona Lois. Biochemical Systematics and Ecology, 26: 915-932.

Cussans, G. W., Raudonius, S., Brain, P., Cumberworth, S., 1996. Effects of depth of seed burial and soil aggregate size on seedling emergence of Alopecurus myosuroides, Galium aparine, Stellaria media and wheat. Weed Research, 36: 133-141.

Grundy, A. C., Mead, A., Bond, W., 1996. Modeling the effect of weed seed distribution in the soil profile on seedling emergence. Weed Research, 36: 375-384.

Hald, A. B., 1999. The impact of changing the season in which cereals are sown on the diversity of the weed flora in rotational fields in Denmark. Journal of Applied Ecology, 36: 24-32.

Kaya, M. D., Okcu, G., Atak, M., Cıkılı, Y., Kolsarıcı, O., 2006. Seed treatments to overcome salt and drought stress during germination in sunflower (Helianthus annuus L.). European Journal Agronomy, 24: 291-295.

Keller, M., Kollmann, J., 1999. Effects of seed provenance on germination of herbs for agricultural compensation sites. Agriculture Ecosystem Environment, 72: 87-99.

Kon, K. F., Follas, G. B., James, D. E., 2007. Seed dormancy and germination phenology of grass weeds and implications for their control in cereals. New Zealand Plant Protection, 60: 174-182.

Lafond, G. P., Baker, R. J., 1986. Effects of genotype and seed size on speed of emergence and seedling vigor in nine spring wheat cultivars. Crop Science, 26: 341-346.

Lenser, T., Theissen, G., 2013. Molecular mechanisms involved in convergent crop domestication. Trends in Plant Science, 18: 704–714.

Lindig-Cisneros, R., Zedler, J., 2001. Effect of light on seed germination in Phalaris arundinacea L. (reed canary grass). Plant Ecology, 155: 75-78.

Martinez-Ghersa, M. A., Satorre, E. H., Chersa, C. M., 2003. Effect of soil water content and temperature on dormancy breaking and germination of three weeds. Weed Science, 45: 791-797.

Meyer, R. S., Purugganan, M. D., 2013. Evolution of crop species: genetics of domestication and diversification. Nature Reviews Genetics, 14: 840–852.

Mohler, C. L., 2001. Mechanical management of weeds. In Liebman, M., Mohler, C. L, Staver, C. P, (eds.) Ecological Management of Agricultural Weeds. Cambridge, UK: Cambridge University Press. Pp. 139-209.

Nazarialam, J., Amiri, H., Shahbazi, S., Dastoori, M., Esmaeilnejadte, I. H., 2012. Biology, phenology and interference of ground cherry (physalis divaricata). International Journal of Food, Agriculture and Veterinary Sciences, 2 (2): 74-86.

Pierce, G. L., Warren, S. L., Mikkelsen, R. L., Linker, H. M., 1999. Effects of soil calcium and pH on seed germination and subsequent growth of large crabgrass (Digitaria sanguinalis). Weed Technology, 13: 421-424.

Radosevich, S., Holt, J., Ghersa, C., 1997. Weed Ecology Implications for Management. Wiley, New York.

Rechinger, K. H., 1982. Flora Iranica, 152. Austria, Graz: Akademische Druck und Verlagsanstalt.

Seeber, G., 1976. Nursery techniques. In: Manual of reforestation and erosion control for the Philippines (Weidelt, H. J, comp.), 229-389. GTZ, Eschborn.

Shahrokhi, S., Hejazi, N., Khodabandeh, H., Farboodi, M., Faramarzi, A., 2011. Allopathic effect of aqueous extracts of pigweed, Amaranthus retroflexus L. organs on germination and growth of five barley cultivars. International Conference on Chemical, Biological and Environmental Engineering, IACSIT Press Singapore. 20: 80-84.

Simsek, S., Ohm, J. B., Lu, H., Rugg, M., Berzonsky, W., Alamri, M. S., Mergoum, M., 2014. Effect of pre-harvest sprouting on physicochemical changes of proteins in wheat. Journal of the Science of Food and Agriculture, 94: 205–212.

Soltani, A., Zeinali, E., Galeshi, S., Latifi, N., 2001. Genetic variation for and interrelationships among seed vigor traits in wheat from the Caspian Sea coast of Iran. Seed Science and Technology, 29: 653-662.

Susko, D. J., Mueller, J. P., Spears, J. F., 1999. Influence of environmental factors on germination and emergence of Pueraria lobata. Weed Science, 47: 585-588.

Szabolcs, I., 1994. Soils and salinization. In Pessarakali, M. (eds.), Handbook of Plant and Crop Stress. Pp: 311. Marcel Dekker, New York.

Tang, D. S., Hamayun, M., Ko, Y. M., Zhang, Y. P., Kang, S. M., Lee, I. J., 2008. Role of red light, temperature, stratification and nitrogen in breaking seed dormancy of Chenopodium album L. Journal of Crop Science and Biotechnology, 11: 199-204.

Qu, X. X., Huang, Y., 2005. The adaptive strategies of halophyte seed germination, Acta Oecologica. Sin, 25 (9): 2389–2398.


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