کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8877835 | 1624273 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Impact of environmental factors on seed germination and emergence of wild poinsettia (Euphorbia geniculata Ortega)
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم زراعت و اصلاح نباتات
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چکیده انگلیسی
Wild poinsettia (Euphorbia geniculata Ortega) is an annual noxious weed that is considered as a substantial problem in irrigated field crops and orchards in Israel. The effect of environmental factors on germination and emergence of a local wild poinsettia population was examined in growth chambers and greenhouse experiments, and its germination dynamics was modelled. Germination was not affected by photoperiodism. Maximum emergence, 43.3%, was obtained from seeds planted on the soil surface; from a depth of 1-7â¯cm, emergence decreased at a constant rate proportionate to depth, from 26.6 to 10.0%. Wild poinsettia germination rate was reduced by high osmotic potential and high NaCl concentrations, with decreased germination compared to controls starting at â0.3â¯MPa and 150â¯mM, respectively. Seeds germinated under all evaluated pH levels, with highest germination value (68%) at pH 7. A Weibull regression was applied for time and accumulated germination at temperatures between 15 and 40â¯Â°C. As reflected by the a and X0 coefficients, the maximum germination percentage and rate were observed at temperatures between 25â¯Â°C (81.6% and 1.35 days, respectively) and 35â¯Â°C (76.5% and 1.84 days, respectively). Germination dynamics was modelled using two thermal time unit concepts, growing degree days (GDD) and beta function. The beta function better fit the data with a root mean square error (RMSE) value of 4.5 compared to 51.1 for GDD. R2 values of 0.22 and 0.98 for the GDD and beta-function models, respectively, further supported superior goodness of fit for the beta-function model. The results presented here contribute to our knowledge of wild poinsettia biology and can promote the use of efficient control strategies.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Crop Protection - Volume 114, December 2018, Pages 68-75
Journal: Crop Protection - Volume 114, December 2018, Pages 68-75
نویسندگان
Amnon Cochavi, Yaakov Goldwasser, Alon Horesh, Karam Igbariya, Ran N. Lati,