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Modeling Drought effect on Seed Dormancy and Germination in Winter Wild Oat (Avena sterilis subsp. ludoviciana) | ||
| دانش علفهای هرز ایران | ||
| دوره 21، شماره 2، دی 1404، صفحه 1-12 اصل مقاله (948.54 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22034/ijws.2026.371458.1514 | ||
| نویسندگان | ||
| Hajar Shafiee؛ Mostafa Oveisi* ؛ Hassan Alizadeh | ||
| دانشکده کشاورزی و منابع طبیعی دانشگاه تهران | ||
| چکیده | ||
| Understanding and predicting the emergence of winter wild oat (Avena ludoviciana Durieu. Gillet & Magne) under changing climate conditions are vital for effective management, yet the combined effects of burial duration and soil moisture on its environmentally driven seed dormancy and germination remain poorly quantified, particularly in arid and semi-arid regions. This study aimed to examine the effects of soil moisture during seed burial on dormancy release and germination dynamics of A. ludoviciana. A factorial experiment in a randomized complete block design (RCBD) with three replications was conducted over two consecutive cropping seasons (2021–2023). Treatments included seed type (intact with hull vs. dehulled), burial duration (1–5 months), and five soil water potentials (0 to −0.8 MPa). Seeds were incubated under controlled temperatures in an incubator reflecting historical soil conditions, and germination was evaluated at six incubation temperatures (5–30 °C) in germinator. Fractional cumulative germination was modeled using a modified Triangle Area Model (TAM) that incorporates the combined effects of burial duration, soil temperature, and moisture. The results showed that burial duration had the greatest influence on germination, followed by soil water potential and temperature. Dehulled seeds germinated more rapidly than intact seeds, indicating the regulatory role of the hull. Maximum germination (~85%) occurred at −0.3 MPa and 15°C, whereas severe drought (−0.8 MPa) reduced germination, suggesting a mechanism for dormancy maintenance under unfavorable conditions. The modified TAM accurately simulated germination dynamics across treatments, achieving an R² of 0.88 and an RMSE of 0.01. Prolonged burial under sufficient moisture progressively reduced dormancy, reflecting interactions between physical and physiological dormancy. The results suggest that summer drought periods, together with the absence of irrigation and the use of summer fallow, may delay the timing of germination in winter wild oat. Although weeds are continually adapting to environmental conditions, drought induced by climate change may promote the emergence of more drought-tolerant forms and lead to shifts in weed emergence flushes in crop fields. | ||
| کلیدواژهها | ||
| رطوبت خاک؛ زمان دفن؛ مدل مساحت مثلث؛ مدیریت علف هرز | ||
| عنوان مقاله [English] | ||
| Modeling Drought effect on Seed Dormancy and Germination in Winter Wild Oat (Avena sterilis subsp. ludoviciana) | ||
| نویسندگان [English] | ||
| Hajar Shafiee؛ Mostafa Oveisi؛ Hassan Alizadeh | ||
| College of Agriculture and Natural Resources, University of Tehran | ||
| چکیده [English] | ||
| Understanding and predicting the emergence of winter wild oat (Avena ludoviciana) under changing climate conditions is vital for effective management, yet the combined effects of burial duration and soil moisture on its environmentally driven seed dormancy and germination remain poorly quantified in arid and semi-arid regions. This study examined the effects of soil moisture during seed burial on dormancy release and germination dynamics of A. ludoviciana. Method: A factorial experiment in a randomized complete block design with three replications was conducted over two consecutive cropping seasons (2021–2023). Treatments included seed type (intact with hull vs. dehulled), burial duration (1-5 months), and five soil water potentials (0 to −0.8 MPa). Seeds were incubated under controlled temperatures reflecting historical soil conditions, and germination was evaluated at six incubation temperatures (5–30°C). Fractional cumulative germination was modeled using a modified Triangle Area Model (TAM) that incorporates the combined effects of burial duration, soil temperature, and moisture. The results showed that burial duration had the greatest influence on germination, followed by soil water potential and temperature. Dehulled seeds germinated more rapidly than intact seeds, indicating the regulatory role of the hull. Maximum germination (~85%) occurred at −0.3 MPa and 15°C, whereas severe drought ((−0.8 MPa) reduced germination, suggesting a mechanism for dormancy maintenance under unfavorable conditions. The modified TAM accurately simulated germination dynamics across treatments, achieving an R² of 0.88 and an RMSE of 0.01. Prolonged burial under sufficient moisture progressively reduced dormancy, reflecting interactions between physical and physiological dormancy. | ||
| کلیدواژهها [English] | ||
| Soil moisture, Burial duration, Triangle Area Model, ٌ Weed management | ||
| مراجع | ||
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