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Yasouj University (YU) is the symbol of higher education in the Southeastern Province of Kohkiluyeh & Boyerahmad. YU began its activities in the year 1983 as Yasouj Technical Institute affiliated to Shiraz University. In the year 1993, by establishing an agricultural institute, it became a higher education complex, still affiliated to Shiraz University and was renamed as Yasouj Higher Education Complex. Following that, given the approval of Higher Education Development Council in 1995, it turned into a state-run university in the year 1996, ind [...]

Journal Article

Journal article

Reaction of Germination and Seedling Growth of Redroot Pigweed (Amaranthus retroflexus) to Salinity and Drought Stress

Ahmadvand, Goudarz; Dehghan Banadaki, Masoume; Alimoradi, Javad; Goudarzi, Sara; et al.

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Salt and drought are two major environmental stresses that affect growth and development of plants. In order to study the effects of sodium chloride and polyethylene glycol (6000) on germination characteristics and early seedling growth of redroot pigweed (Amaranthus retroflexus), two completely randomized designs with 4 replications were conducted at Weed Research Laboratory of Bu-Ali Sina University, Hamedan in 2015. The treatments were salt and drought stress as osmotic potential at six levels (zero (control), -2, -4, -6, -8 and -10 bar). The results showed that when stress increased, germination percentage, germination speed, radicle and plumule length, seedling length and seedling vigor index decreased significantly (p 0.05). With an increase in the intensity of salt and drought stress from zero to -10 bars, redroot pigweed seed germination reduced about 96 and 100 percent, respectively, compared with the control. The highest seedling length in both stresses was observed in the control (7.71 cm) and by increasing stress intensity to -10 bars in both salinity and drought stresses, seedling length was reduced to 1.52 cm and 0 cm, respectively. Fitting of the three-parameter logistic model provided a successful estimation of the relationship between salt and drought stress levels and germination percentage of redroot pigweed as well as germination speed. This model showed that salinity and drought stress at -3.58 and -3.75 bars caused a 50% reduction in
maximum germination percentage of redroot pigweed. In addition, 50% decrease in germination speed caused by salinity and drought stress was observed in -2.58 and -2.88 bars, respectively. Highlights:The germination characteristics of redroot pigweed were studied under salt and drought stresses.Drought stress reduced germination percentage of redroot pigweed.

(Revue

Iranian Journal of Seed Research