EFFECT OF SEED PRIMING ON GERMINATION AND SEEDLING GROWTH OF TWO MEDICINAL PLANTS UNDER SALINITY

By Mohammad Sedghi, A. Nemati, B. Esmaielpour. 2010

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Priming is one of the seed enhancement methods that might be resulted in increasing seedperformance (germination and emergence) under stress conditions such as salinity, temperature anddrought stress. The objective of this research was to evaluate the effect of different priming types onseed germination of two medicinal plants including pot marigold (Calendula officinalis) and sweetfennel (Foeniculum vulgare) under salinity stress. Treatments were combinations of 5 levels ofsalinity stress (0, 2.5, 5, 7.5 and 10 ds m-1) and 5 levels of priming (control, GA3, Manitol, NaCl anddistilled water) with 3 replications. Seeds of pot marigold and sweet fennel were primed for 24 h at25°C. Results indicated that with increasing salinity, germination traits such as germination percent,rate and plumule length decreased, but seed priming with GA3 and NaCl showed lower decrease. Inall of the salinity levels, primed seeds (except manitol) possessed more germination rate and plumulelength than control. The highest radicle fresh and dry weight in pot marigold was seen at 7.5 ds m-1salinity stress level. It seems that higher germination rate in pot marigold shows higher tolerance tosalinity than sweet fennel. Priming with NaCl and GA3 caused an increase in germination percent ofpot marigold and sweet fennel in various range of salinity, but in lower salinity levels percent ofgermination was higher than upper ones. The result of this experiment is consistent with thehypothesis that under undesirable conditions such as salinity stress, priming with GA3 and NaCl canprepare a suitable metabolic reaction in seeds and can improve seed germination performance andseedling establishment

Subfields: Physiology, Plant Science

View Paper: https://www.semanticscholar.org/paper/d3b46583f5ca2e9c0e3fbbd5d7fa77a80ba48785

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