Effects of drought stress on germination indices and early seedling growth in medicinal plant of dill (Anethum graveolens L)
Subject Areas : Ecophysiology & Phytochemistry of Medicinal and Aromatic Plants
Keywords: Drought stress, germination, Polyethylene glycol, Dill,
Abstract :
In order to evaluation the effect of drought stress on germination indices and early seedling growth of medicinal herb dill (Anethum graveolens L), an experiment was conducted in the agricultural laboratory of Urmia Payam Noor university in 2015 as a randomized complete block design with four replications. Treatments were five levels of drought stress (0, -1, -2, -3 and -4 bar induced by polyethylene glycol, which was considered zero bar as control). In this research were measured, root, stem and seedling dry weight, germination percent, germination rate, germination uniformity, rate germination index, mean germination time, Mean rate of germination, Coefficient of velocity of germination, Amount germination index, seedling weight vigor index, seedling length vigor index, seed vigor index, reduction percent of seed weight, root tolerance index and stem tolerance index. The results of analysis variance showed that effect of different level of drought stress on all of studied in this research had significantly at 1% probability level. Mean comparison revealed that with increasing drought stress, root, stem and seedling dry weight and total germination indices exception mean germination time decreased significantly. Drought stress of -4 and -3 bar in compared with control treatment, seedling dry matter decreased 95 and 87 percent, respectively. There are high positive correlation between germination indices and tolerance indices to drought stress with morphological traits such as root, stem and seedling dry weight, and we can use these traits to assess resistance to drought stress during seed germination and seedling of dill.
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