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تاثیر پرایمینگ بذر با اکسین بر جوانهزنی، صفات فیزیولوژیکی و کنترل بیماری رایزوکتونیایی پنبه | ||
علوم و تحقیقات بذر ایران | ||
مقاله 7، دوره 5، شماره 1، خرداد 1397، صفحه 83-93 اصل مقاله (1.06 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22124/jms.2018.2902 | ||
نویسندگان | ||
الهه لطفعلی نژاد* 1؛ سید جواد صانعی2؛ سید اسماعیل رضوی3 | ||
1دانشجو/ دانشگاه علوم کشاورزی و منابع طبیعی گرگان | ||
2دانشگاه علوم کشاورزی و منابع طبیعی گرگان | ||
3استادیار/ دانشگاه علوم کشاورزی و منابع طبیعی گرگان | ||
چکیده | ||
در تحقیق حاضر تاثیر پرایمینگ با غلظتهای مختلف اسیدایندول- 3- استیک (IAA) بر جوانهزنی بذر و برخی ویژگیهای فیزیولوژیک سه رقم پنبه شامل ساحل، گلستان و ورامین، همچنین کنترل بیماری مرگ گیاهچه ناشی از Rhizoctonia solani در دو آزمایش جداگانه مورد مطالعه قرار گرفت. در آزمایش اول، اثر غلظتهای 0، 1/0، 01/0 و 001/0 میکرومولار IAA بر جوانهزدن بذر در تشتکهای پلاستیکی بررسی گردید. در آزمایش دوم، تاثیر تیمارهای ذکر شده بر کنترل بیماری مرگ گیاهچه بررسی شد. طول ریشه، طول ساقه و وزنِ خشک کل گیاهچهها پس از 28 روز اندازهگیری گردید و محتوای کل فنل عصارهی الکلی توسط معرف فولین- سیوکالتو تخمین زده شد. نتایج نشان داد که جوانهزنی بذر، رشد ریشه، ساقه و وزنِ خشک کل بهطور معنیداری توسط غلظتهای پایین IAA (01/0 و 001/0 میکرومولار) افزایش داشته است. همچنین استعمال غلظتهای 01/0 و 001/0 میکرومولار از IAA میزان شاخص بیماری ناشی از R. solani را بهترتیب 17% و 38% در رقم ساحل و 1% و 5/33% در رقمهای گلستان و ورامین کاهش داد. این غلظتها سبب افزایش محتوای فنل کل گیاهچه شد. اثر پرایمینگ در سه رقم پنبه مورد مطالعه تاثیر معنیداری بر تغییر برخی از ویژگیهای فیزیولوژیک و شاخص بیماری داشت. | ||
کلیدواژهها | ||
پرایمینگ؛ پنبه؛ جوانهزنی؛ Rhizoctonia | ||
مراجع | ||
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