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بررسی اکوفیزیولوژی جوانه زنی بذر علفهرز بزچره (Dodartia orientalis L.) | ||
| علوم و فناوری بذر ایران | ||
| مقاله 14، دوره 7، شماره 2 - شماره پیاپی 14، بهمن 1397، صفحه 195-204 اصل مقاله (657.35 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22034/ijsst.2018.110048.1076 | ||
| نویسندگان | ||
| فریبا میقانی* 1؛ محمد مهیمنی2 | ||
| 1عضو هیئت علمی | ||
| 2فارغ التحصیل | ||
| چکیده | ||
| بزچره با نام علمی (Dodartia orientalis) علفهرزی چندساله و مهاجم از تیره میمون (Scrophulariaceae) است که تاکنون پژوهش جامعی درباره زیستشناسی و اثر برخی از عوامل محیطی بر تولید مثل جنسی آن صورت نگرفته است. از این رو، آزمایشهایی با هدف شناسایی عوامل موثر بر جوانهزنی بذر این علفهرز از جمله اثر دمای ثابت و متناوب، نور، اسید سولفوریک غلیظ، ژیبرلین و تنش شوری (NaCl) در بخش تحقیقات علفهایهرز، موسسه تحقیقات گیاهپزشکی کشور انجام شد. نتایج نشان داد که زیستایی بذر بزچره 5/62 درصد و وزن هزار دانه آن 058/0 گرم بود. دمای بهینه ثابت و متناوب برای جوانهزنی به ترتیب 22 و 15/25 درجه سانتیگراد است. دمای متناوب برای جوانهزنی بذر بزچره مناسبتر از دمای ثابت بود. بذر بزچره برای جوانهزنی نیاز به نور ندارد. تیمار بذر بزچره با اسید سولفوریک غلیظ به مدت دو دقیقه، بهترین محرک برای شکستن خواب آن بود، در حالی که تیمار بذر با ژیبرلین، تاثیری بر جوانهزنی آن نداشت. بذر بزچره دوزهای کمتر از 200 میلیمولار کلرید سدیم را تحمل میکند. | ||
| کلیدواژهها | ||
| تولید مثل زایشی؛ جوانهزنی بذر؛ علفهرز چند ساله | ||
| عنوان مقاله [English] | ||
| Study of ecophysiology of seed germination of Dodartia orientalis L. | ||
| نویسندگان [English] | ||
| Fariba Meighani1؛ mohammad mohaimeni2 | ||
| 1member of scientific board | ||
| 2graduated | ||
| چکیده [English] | ||
| Dodartia orientalis is an invasive and perennial weed of the Scrophulariaceae family. Comprehensive research in association with the biology and some environmental factors on sexual reproduction of this weed has not done yet. in order to study of some factors affecting on seed germination of this weed, an experiment took place in Weed Research Department of Iranian Research Institute of Plant Protection that included effect of temperature, light, scarification with concentrated sulphuric acid, gibberelin, and salt stress (NaCl) on seed germination. Dodartia seed viability was 62.5%. Optimum constant temperature for seed germination was 22◦C, and optimum alternate temperature was 25/15◦C. Alternating temperatures compared to constant temperatures was more appropriate for seed germination of Dodartia. The seed did not need to light for germination. Chemical stimulation of seed with concentrated sulfuric acid (98%) for 2 min was the best stimulus for breaking dormancy of this weed. Gibberelin was not able to stimulate Dodartia seed germination. The seeds germinated at the concentrations of NaCl lower than 200 Mm. | ||
| کلیدواژهها [English] | ||
| perennial weed, seed biology, sexual reproduction | ||
| مراجع | ||
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