کمی سازی پاسخ جوانه‌زنی شوید (Anethum graveolens L.) به دما و تنش خشکی توسط مدل زمان حرارتی-رطوبتی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 هیات علمی دانشکده کشاورزی، مجتمع آموزش عالی تربت جام

2 دانشکده کشاورزی، مجتمع آموزش عالی تربت جام، خراسان رضوی ایران

چکیده

دما و‎ ‎رطوبت‎ ‎از‎ ‎مهمترین‎ ‎عوامل‎ ‎محیطی‎ ‎کنترل کننده‎ ‎جوانه‌زنی در‎ ‎گیاهان می‌باشند. به‎ ‎منظور‎ ‎بررسی‎ ‎تأثیر‎ ‎دما و ‏تنش خشکی‎ ‎بر‎ ‎جوانه‌زنی‎ ‎بذر‎ ‎شوید و کمی سازی آن،‎ ‎آزمایشی‎ ‎به‎ ‎صورت‎ ‎فاکتوریل‎ ‎با‎ ‎هشت‎ ‎سطح‎ ‎دما شامل‎ ‎‏5، 10، ‏‏15، 20، 25، 30، 35 و 40‏‎ ‎درجۀ‎ ‎سلسیوس‎ ‎و‎ ‎هفت‎ ‎سطح‎ ‎تنش‎ ‎خشکی‎ ‎شامل‎ ‎‏0، 1/0-، 2/0-، 3/0-، 4/0-، 5/0- و ‏‏6/0- مگاپاسکال انجام‎ ‎شد‎.‎‏ نتایج نشان داد در‎ ‎همۀ‎ ‎سطوح‎ ‎دمایی‎ ‎با‎ ‎کاهش‎ ‎پتانسیل‎ ‎اسمزی، میزان جوانه‌زنی‎ ‎کاهش‎ ‎یافت، با این‌وجود شدت این کاهش در محدوده حرارتی 20 تا30 درجه سانتی‌گرداد کمتر بود. با دو روش مختلف، ‏درجه حرارت پایه جوانه‌زنی شوید 3/2 و 9/2 درجه ساتیگراد و درجه حرارت حداکثر جوانه‌زنی آن 0/ 43و 3/47 ‏درجه سانتی برآورد شد. دمای مطلوب جوانه‌زنی برای شوید نیز حدود 26 درجه سانتی‌گراد به دست آمد. مقدار ‏پتانسیل آب پایه برای جوانه‌زنی شوید در مدل زمان حرارتی-رطوبتی نیز 53/0- مگاپاسکال محاسبه شد. نتایج ‏همچنین نشان داد که با افزایش حرارت پتانسیل آب پایه برای جوانه‌زنی بذر شوید در حد نیم واحد مگاپاسکال ‏افزایش یافت. در نهایت مشخص شد که در صورت متغییر در نظر گرفتن پتانسیل آب پایه در واکنش به تغییرات دما، ‏مدل زمان حرارتی-رطوبتی به‌خوبی قادر است پاسخ جوانه‌زنی شوید به حرارت و رطوبت را کمی کند.‏

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Quantifying of germination response in dill (Anethum graveolens L.) to temperature and drought stress by hydrothermal time model

نویسندگان [English]

  • Seyyed Farhad Saberali 1
  • Mohammad Naser Mododi 2
1 Agricultural faculty, High educational complex of Torbat-e Jam
2 Agriculture faculty , High Educational Complex of Torbat-e Jam, khorasan Razavi, Iran
چکیده [English]

Temperature and water are the most important environmental factors controlling seed germination in ‎plants. In order to investigate the effect of temperature and drought stress on seed germination and ‎quantifying of germination; a factorial experiment was conducted with eight temperature levels including ‎‎5, 10, 15, 20, 25, 30, 35 and 40 degrees Celsius and the seven levels of drought stress including 0, 0.5-‎‎0.0, -0.2, -0.3, -0.4, -0.5 and -0.6 MPa, respectively. The results showed that the germination was ‎decreased by decreasing osmotic potential at all temperature levels. However, the intensity of this ‎decrease was less in the range of 20 to 30°C. Using two different methods, the base and maximum ‎temperature of dill germination was estimated in the range of 2.3 and 2.9 °C and 43.0 and 47.3 °C, ‎respectively. The optimum temperature for dill germination was 26 °C. The estimated value of base ‎water potential for germination was -0.53 Mpa with the hydrothermal time model. The results also ‎showed that water base potential for dill germination was increased by -0.5 Mpa as temperature ‎increased. Finally, it was found that if the base water potential taking into account variable in response to ‎changing temperature, then the hydrothermal time model can be good enough to quntify dill germination ‎response to temperature and water.‎

کلیدواژه‌ها [English]

  • Base water potential
  • Medicinal plant
  • modelling and probit analysis.‎
  1. Akram-Ghaderi, F., Soltani, A. & Sadeghipour H.R. (2008). Effect of temperature and water potential on germination of medicinal pumpkin (Cucurbita pepo. convar. pepo var. styriaca), black cumin (Nigella sativa L.) and borago (Borago officinalis L.). Journal of Agricultural Sciences and Natural Resources, 15(5), 157-170. (In Farsi)
  2. Allen, P.S., Meyer, S.E. & Khan, M. A. (2000). Hydrothermal time as a tool in comparative germination studies. In: Black, M., Bradford, K. J., Vazquez-Ramos J. (Ed), Seed biology: Advances and applications, (pp.401–410) CAB International, Wallingford, UK.
  3. Alvarado, V. & Bradford K. J. (2002). A hydrothermal time model explains the cardinal temperatures for seed germination. Plant, Cell and Environment, 25(8), 1061–1069.
  4. Baskin , C.C. & Baskin, J. M. (2014). Seeds: Ecology, biogeography and evolution of dormancy and germination (2nd ed) . Elsevier/Academic Press, San Diego, California, USA.
  5. Bochet, E., García-fayos, P., Alborch, B. & Tormo, J. (2007). Soil water availability effects on seed germination account for species segregation in semiarid roadslopes. Plant and Soil, 295 (1), 179 – 191.
  6. Boddy, L. G., Bradford, K. J. & Fischer, A. J.(2012). Population-based threshold models describe weed
  7. germination and emergence patterns across varying temperature, moisture and oxygen conditions. Journal of Applied Ecology 2012, 49(4), 1225–1236.
  8. Bradford, K.J. (1995). Water relations in seed germination. In: Kigel, J., Galili, G. (Ed), Seed Development and Germination. (pp.351–396.) Marcel Dekker, New York,
  9. Bradford, K.J. (2002). Application of hydrothermal time to quantifying and modeling seed germination and dormancy. Weed Science, 50(2), 248–260.

10. Chantre, G. R., Batlla, D., Sabbatini, M. R. & Orioli, G. (2009). Germination parameterization and development of an after-ripening thermal-time model for primary dormancy release of Lithospermum arvense seeds. Annals of Botany, 103 (8), 1291–1301.

11. Dahal, P. & Bradford, K.J. (1994). Hydrothermal time analysis of tomato seed germination at suboptimal temperature and reduced water potential. Seed Science Research, 4(2), 71–80.

12. Ellis, R. H, Covell S., Roberts E.H. & Summerfield R.J. (1986). The influence of temperature on seed germination rate in grain legumes. II. Intraspecific variation in chickpea at constant temperatures. Journal of Experimental Botany, 37(10),1503–1515.

13. Fenner. M. & Thompson K. (2005). The ecology of seeds. Cambridge University Press, Edinburgh House, Cambridge. 250 p.

14. Fernandez, G. & Johnston M. (1995). Seed vigor testing in lentil, bean, and chickpea. Seed Science and Technology, 23(1), 617-627.

15. Finney, D. J. (1971). Probit analysis. Third edition. Cambridge University Press, Cambridge.

16. Grundy, A.C., Phelps, K., Reader, R.J. & Burston, S. (2000). Modelling the germination of Stellaria media using the concept of hydrothermal time. New Phytologist, 148(3), 433–444.

17. Gummerson R. J. (1986). The effect of constant temperatures and osmotic potential on the germination of sugerbeet. Journal of Experimental Botany, 37(7),729–741.

18. Hasandokht, M. R. (2012). Vegetables Production Technology. Selsele Press. Tehran. Iran. (in Farsi)

19. Kebreab, E. & Murdoch, A.J. (1999). Modelling the effects of water stress and temperature on germination rate of Orobanche aegyptiaca seeds. Journal of Experimental Botany ,50 (334), 655–664.

20. Kebreab, E. & Murdoch, A.J.( 2000). The effect of water stress on the temperature germination rate of Orobanche aegyptiaca seeds. Journal of Experimental Botany, 50(2), 655-664.

21. Larsen, S.U., Bailly, C., Côme D. & Corbineau, F. (2004). Use of the hydrothermal time model to analyse interacting effects of water and temperature on germination of three grass species. Seed Science Research, 14 (1), 35-50.

22. Michel, B.E. & Kaufmann, M.R. (1973). The osmotic potential of polyethylene glycol 6000. Plant Physiology 51(5), 914–916.

23. Ni, B.R. & Bradford, K.J. (1992). Quantitative models characterizing seed germination responses to abscisic acid and osmoticum. Plant Physiology, 98(3), 1057–1068.

24. Nozari-nejad, M., Zeinali, E., Soltani, A., Soltani, E. & Kamkar,  B. (2013). Quantify wheat germination rate response to temperature and water potential. Journal of Crop production, 6 (4). 117-135. (In Farsi)

25. Rowse, H.R. & Finch-Savage, W. E. (2003). Hydrothermal threshold models can describe the germination response of carrot (Daucus carota) and onion (Allium cepa) seed populations across both sub- and supra-optimal temperatures. New Phytologist, 158(1), 101–108.

26. Steinmaus, S.J., Timonthy, S.P. & Jodie, S.H. (2000). Estimation of base temperature for nine weed species. Journal of Experimental Botany, 51(3), 275– 286.

27. Wang, R., Bai, Y. & Tanino, K. (2005). Germination of winterfat (Eurotia lanata  Moq.) seeds at reduced water potentials : testing assumptions of hydrothermal time model. Environmental and Experimental Botany 53(1), 49–63.

28. Wen-Hu, X., Fan, Y., Baskin, C. C., Baskin  J.M. & Wang Y. R. (2015). Comparison of the effects of temperature and water potential on seed germination of Fabaceae species from desert and Subalpine grassland. American Journal of Botany 102 (5), 649 – 660.