Effects of drought stress, gibberellic acid and ascorbate on hill reaction, and photosynthetic Pigment in Thyme (Thymus vulgaris L.)

Halimeh Rezaei¹ Zahra Bani Jamal² Faezeh mir Sanee³

1) Ph.D., an expert on al-Khwarizmi PAKDASHT Research center, Tehran, Iran.
2) MA. Expert PAKDASHT Khwarizmi Research center, Tehran, Iran.
3) Associate member PAKDASHT Khwarizmi Research center, Tehran, Iran.

محل انتشار : سومین کنفرانس بین المللی علوم مهندسی و تکنولوژی(3icoesat.com)
Abstract :
Due to study the effect of drought stress, ascorbate and gibberellin foliar application on some photosynthetic pigments and Hill reaction rate, an experiment was done as factorial in the basis of completely randomized design in 4 replication . Irrigation in 3 levels (FC, 2/3 FC and 1/3 FC), ascorbate in 2 levels (0 and 10 mM) and gibberellin in 2 levels ( 0 and 10 mM). The results indicated that, the effects drought stress, gibberellin and ascorbate on chlorophyll content, Xanthophyll, β-carotene, Hill reaction rate were significant. The triple interaction effect results indicated that, 10 mM gibberellin and ascorbate foliar application under normal irrigation condition gained to maximum amounts of chlorophyll α ( 10.44 μg/ml) and Hill reaction rate( 1.14 (%OD)/min). Also, in these conditions, the minimum amounts of Xanthophyll ( 0.33μg/ml) and β-carotene ( 0.20( μg)/ml) conducted. Ascorbate and gibberellin consumption in both non stress and stress conditions increased leaching as the main indicator factor of photosynthetic in Thyme.
Keywords : Thyme( Thymus vulgaris L.), ascorbate, gibberellin, Drought stress, Chlorophyll, Hill reaction rate