The effects of drought stress on seed germination and some of morphological and physiological traits in Trachyspermum ammi
امین باقی زاده
1
(
دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته
)
Malihe Afroushte
2
(
Graduate University of Advanced Technology
)
Baratali Fakheri
3
(
Department of Agronomy and Plant Breeding, Zabol University
)
Keywords: Polyethylene glycol, Proline, soluble sugar, morphological and physiological characteristics,
Abstract :
In order to assess the response of ajowan to drought stress that induced by PEG 6000 on germination and growth stages, two separate experiments that in each useed completely randomized design with three replications were done. In first experiment, the response of germination of ajowan seeds was investigated to different levels of drought stress include osmotic potential of zero (control), - 1/5, -2, -2/5 and -3bar that prepared by PEG6000. The second experiment was same first, but in this experiment, morphological and physiological characters of ajowan in different level of drought stress were evaluated. Results of Anova at our data showed that drought stress has significant effect (p≤0/01) on germination characters such as germination percentage, germination rate, height of plumule, length of radicle, dry weight of radicle and plumule. Mean comparison of treatments showed, with increase in drought stress, all the above characters have been reduced. Morphological traits such as leaf area, fresh and dry weight of shoot and root and shoot dry weight ratio to root decreased under drought stress. Also, drought stress had a significant effect on the amount of proline and soluble sugars in the aerial part and root. Comparison of mean of treatments showed that, with increasing stress, the amount of proline and soluble sugars in the shoot and root increased (p≤0/01). The results showed, that germination parameters were reduced by drought stress. Ajowan showed differently responce to tolerate drought stress. Ajowan plant for tolerance to drought stress has different reactions, including reduction of traits such as leaf area and dry and fresh weight of aerial part and root and increase traits such as proline content and soluble sugars.