Pretreatment of Sesame Seed (Sesamum indicum L.) with Proline and its Effective on Seed Germination and Plant Physiological Defense Systems under Different Temperature Regimes

Subject Areas : Journal of Crop Ecophysiology

Nasibeh  Tavakoli ¹ (Ph.D. Student of Crop Physiology, Faculty of Agriculture, University of Mohaghegh Ardabili, Ardabil, Iran)
Ali  Ebadi ² (Associate Prof., Department of Agronomy and Plant Breeding, Faculty of Agriculture, University of Mohaghegh Ardabili, Ardabil, Iran)
Hourieh  Tavakoli ³ (Ph.D. Student of Crop Physiology, Faculty of Agriculture, University of Mohaghegh Ardabili, Ardabil, Iran)
Payam  Tizfahm ⁴ (M.sc. Student of Agronomy, Faculty of Agriculture, University of Mohaghegh Ardabili, Ardabil, Iran)

Received: 2015-01-21 Accepted : 2016-03-09 Published : 2016-06-21

Keywords: germination, antioxidant enzyme, Proline, Sesame,

Abstract :

To study the effects of proline and temperature on the rates of antioxidant enzymes and germination index, a factorial laboratory experiment based on completely randomized design was conducted with three replications at the Mohaghegh Ardabili University in 2014. Treatments cinsisted of three levels of proline (0, 5 and 10 mM) and different temperature regimes (15, 25 and 35°C). Results showed that proline significantly increased germination index, rates of antioxidant enzymes, proline, protein and mobility of food reserves. Exogenous application of proline increased assimilates in the seedlings. However, proline synthesis was decreased at temrature regimes of 15 and35°C as compared to 25 °C. Peroxidase enzyme rate at 25°C was lowere than of 15 and 35 °C and addition of proline increased levels of enzymes at these temperature regemes. Application of 10 mM proline at 25 °C showed the highest activity of catalase and polyphenol oxidase rates. However, rates of these enzymes at 15 and 35°C decreased as compared with that of 25°C. The length of radicle increased at all temperatures regemes and the length of plumule increased by proline, but reduced at temperatures of 15 and 35°C. According to the positive effects of proline on food reserves and seed vigor index, speed and rate of germination, proline, protein and antioxidant enzymes contents of seedlings, it seems that pretreatment of seeds with proline is an appropriate method for better seed germination attributs under these temperatures regemes.

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