Germination two rangelands species of Helichrysumglobiferum and Helichrysumaucheri under water stress
Subject Areas : forest
zeinab jafarian
1
(
استادیار دانشگاه علوم کشاورزی و منابع طبیعی ساری
)
elahe ahmadi
2
(
دانش آموخته کارشناسی ارشد مرتعداری دانشگاه علوم کشاورزی و منابع طبیعی ساری
)
Keywords: Water stress, speed of germination, percentage of germination, allometric coefficient,
Abstract :
Abstract Arid and semi-arid rangelands are formed the most areas of Iran, hence it is necessary to be tolerant the plants of this region against drought. Using of resistant species to drought is vital for improving and developing of the rangelands. In this study, we evaluated the effects of drought stress on Helichrysum globiferom and Helichrysum aucheri germination properties. Seeds of two species were collected of Qushchy rangelands in 70 kilometers of the old road of Urmia –Karabakh. A factorial experimental design with four repeats and four salinity levels (0-50-100-150 mM PEG) in Seed Ecology laboratory of Sari Natural Resource Faculty was chosen. Results showed that drought stress had a significant subtractive effect on percentage and speed of germination, stem, and plant and root length in two Species. About all studied traits, the species of Helichrysum globiferom had more reduction properties than Helichrysum aucheri species. The ratio of Root to shoot length (allometric coefficient) also was the highest in Helichrysum globiferom. So the highest decrease in both species was observed in germination in treatment 100 and 150 mM because in this treatment no seed is germination. Therefore, as the species of Helichrysum globiferom is more resistant than another one, it is suggested to use it for improving and developing of rangelands.
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