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

Subject Areas :

Hamid  Bagheri ¹ (M.Sc. Student of Agronomy, Zanjan University, Zanjan, Iran.)
Yousof  Ghazi Khanloosani ² (M.Sc. Student of Agronomy, Zanjan University, Zanjan, Iran.)
Esmaiel  Zangani ³ (Assistant Prof., Agronomy and Plant Breeding Dept., Zanjan University, Zanjan, Iran.)
Babak  Andelibi ⁴ (Assistant Prof., Agronomy and Plant Breeding Dept., Zanjan University, Zanjan, Iran.)
Mohamad Reza  Azimi Moghadam ⁵ (M.Sc. Student of Agronomy, Zanjan University, Zanjan, Iran.)
Soleiman  Jamshidi 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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