Seed germination indices and initial growth of safflower seedlings with different thousand kernel weights under drought stress

Subject Areas : Agroecology Journal

Hamid Bagheri ¹ , Yousof Ghazi Khanloosani ² , Esmaiel Zangani ³ , Babak Andelibi ⁴ , Mohamad Reza Azimi Moghadam ⁵ , Soleiman Jamshidi ⁶

1 - M.Sc. Student of Agronomy, Zanjan University, Zanjan, Iran.
2 - M.Sc. Student of Agronomy, Zanjan University, Zanjan, Iran.
3 - Assistant Prof., Agronomy and Plant Breeding Dept., Zanjan University, Zanjan, Iran.
4 - Assistant Prof., Agronomy and Plant Breeding Dept., Zanjan University, Zanjan, Iran.
5 - M.Sc. Student of Agronomy, Zanjan University, Zanjan, Iran.
6 - Faculty Member of Miyaneh Branch, Islamic Azad University, Miyaneh, Iran.

Received: 2012-02-15 Accepted : 2012-11-01 Published : 2012-09-22

Keywords: Drought stress, Seedling establishment, Polyethylene glycol, Carthamus tinctorius,

Abstract :

Tolerant seeds to drought stress could play significant role in steady seedling establishment and subsequent yield increase. In order to study the germination and initial seedling growth indices of safflower (cv. Sina) seeds with different thousand kernel weights (TKW) of 23, 23.83, 25.13 and 27.27 g, under different drought stress intensities, an experiment was carried out as factorial based on a completely randomized design in Physiology Laboratory of Zanjan University. Drought stress levels comprising 0 (control), -4 and -8 bar were obtained using polyethylene glycol 6000. Increasing drought stress intensity significantly decreased germination percentage from 81.8% in control to 57.8% in -8 bar. Seeds with higher TKW were better in terms of germination percentage and germination coefficient rate. The seeds with 27.27 TKW produced longer radicle and plumule in drought stress condition. Besides, seeds with higher TKW showed higher vigor index and seedling dry and fresh matter. In conclusion, seeds with higher TKW showed higher germination indices and were more tolerant to drought stress.

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