H.R Eisvand; A. Sharafi; A. Ismaeili
Abstract
Satureja khuzistanica Jamzad. belongs to the family labiateae of which several species are growing in different regions of Iran. Germination is one of the important growth stages in plant life cycle that usually is affected and disturbed by unfavorable conditions. Drought stress is considered as an important ...
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Satureja khuzistanica Jamzad. belongs to the family labiateae of which several species are growing in different regions of Iran. Germination is one of the important growth stages in plant life cycle that usually is affected and disturbed by unfavorable conditions. Drought stress is considered as an important unfavorable factor for a main part of Iran. Seed priming is a technique to improve seed quality for stress conditions. The study was performed in a factorial experiment based on a completely randomized design with three replications and three factors. The first factor consisted of three levels of moisture stress (0, -4 and -8 bar), the second factor was osmopriming (0, -4 and -8 bar) and the third factor consisted of two levels of priming temperature (15 and 25 °C). PEG6000 was used to induce osmotic stress in priming and germination medium. Germination percentage and rate, seedling fresh and dry weights, seedling length and vigor index decreased by increasing drought stress, while the number of root increased up to -4 bars and then decreased. Hydro and osmopriming could improve the seed quality. Interaction effect of drought and osmotic potential of priming was significant for germination percentage and rate, seedling dry weight, number of root and vigor index. The seeds hydroprimed at 15°C had the highest germination percentage and rate, vigor index, seedling dry weight and number of roots under control (0 bar) and mid stress (-4 bar) conditions, while the highest germination rate and vigor index were recorded for the seeds primed at -4 bar and 15°C under severe drought condition (-8 bar). The longest roots were obtained at osmopriming at -8 bars and 25°C in control and drought conditions. All traits were affected by priming temperature, except the number of root, as most of the traits primed at 15°C showed a better condition.
M.A. Alizadeh; H.R. Isvand
Volume 20, Issue 3 , October 2004, , Pages 301-307
Abstract
The majority of the crop seeds have physiological dormancy after harvesting. This phenomenon is depending to different physiological dormancy. This phenomenon can overcome by pre-treatment including prechilling, pre-heating, dry storage condition, using chemical for promoting germination and overcoming ...
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The majority of the crop seeds have physiological dormancy after harvesting. This phenomenon is depending to different physiological dormancy. This phenomenon can overcome by pre-treatment including prechilling, pre-heating, dry storage condition, using chemical for promoting germination and overcoming of inhibitor substances. In this study the seeds of two medicinal species (Eruca sativa Lam. and Anthemis altissima L.) under two cold room (4°C) and dry storage (room temperature) conditions were maintained over six months and tested by standard germination test. The physiological quality of the seed rocket plant had not any significance differences in two conditions. The reason might be due to non-physiological dormancy of the seed species. Whereas, percent of germination in the species of chamomile was significant in the two conditions. As it is clear the percent of germination of the chamomile from dry storage condition was higher from cold room condition and this due to physiological dormancy of plant seed which overcome by dry storage condition. The speed and vigor index of plant seed had no significant differences in two conditions.
