Akademik Veri Yönetim Sistemi
Journal of Tekirdag Agricultural Faculty, cilt.23, sa.2, ss.545-553, 2026 (ESCI, Scopus, TRDizin)
In this study, the germination performance of Asclepias curassavica L. seeds under salinity and drought stress, as well as their effects on radicle and plumule, were investigated. For the salinity stress experiment, solutions were prepared using 6 different NaCl at 0, 50, 100, 150, 200 and 250 mM. To simulate drought stress, six distinct levels of water stress were created using polyethylene glycol-6000 (PEG 6000) solutions with varying water retention capacities, encompassing 0, -2, -4, -6, -8, and -9.8 bar. Germination trials were carried out with 20 seeds in each petri dish according to the random plots experimental design with four replications. In order to examine the germination performances of the seeds, the petri dishes in which the solutions to create the stress conditions were applied and the seeds were placed were tested for 15 days in a controlled germination cabinet with a constant ambient temperature of 20°C, 70% humidity, 14 hours of light, and 10 hours of dark conditions. According to the results obtained, in salinity stress applications, the germination rate of Asclepias curassavica L. seeds ranged from 100.00% to 5.00%; the radicle length varied between 34.34 mm and 2.65 mm; the plumule length ranged from 35.11 mm to 8.11 mm; the fresh weight of the radicle fluctuated between 9.38 mg and 0.70 mg; and the fresh weight of the plumula varied from 20.25 mg to 5.88 mg. In drought stress treatments, the germination rate of Asclepias curassavica L. seeds ranged from 100.00% to 65.00%; radicle length ranged from 33.86 mm to 5.89 mm; plumule length ranged from 23.86 mm to 10.04 mm; radicle fresh weight ranged from 8.95 mg to 2.53 mg; and plumule fresh weight ranged from 15.55 mg to 5.58 mg. The study indicates that low to moderate salt levels did not hinder the germination of Asclepias curassavica seeds, but salt stress could lead to a reduction in radicle and plumule growth, resulting in disproportionate development of the plants. Additionally, it was concluded that the germination of Asclepias curassavica seeds was preserved under drought stress up to a certain level, with root and shoot growth increasing compared to plants that were not exposed to stress. These findings highlight the species' ability to adapt under stress conditions