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تأثیر تنشهای خشکی و شوری بر خصوصیات جوانهزنی بذر، رشد و محتوای پرولین گیاهچه مینا چمنی (Bellis perennis L. “Bellissima Mixture”) | ||
علوم و تحقیقات بذر ایران | ||
مقاله 8، دوره 5، شماره 2، تیر 1397، صفحه 83-93 اصل مقاله (1.06 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22124/jms.2018.2913 | ||
نویسندگان | ||
حسن بیات* 1؛ محمد حسین امینی فرد2 | ||
1گروه علوم باغبانی، دانشکده کشاورزی دانشگاه بیرجند | ||
2استادیار گروه علوم باغبانی دانشکده کشاورزی دانشگاه بیرجند | ||
چکیده | ||
جوانهزنی و سبز شدن بذر به شدت تحت تأثیر تنشهای محیطی از جمله شوری و خشکی قرار میگیرد. به منظور بررسی اثر تنشهای خشکی و شوری بر جوانهزنی بذور گیاه مینا چمنی (Bellis perennis L. “BellissimaMixture”)، دو آزمایش مجزا در قالب طرح کاملاً تصادفی با سه تکرار انجام شد. تیمارهای آزمایشهای خشکی و شوری شامل هفت سطح پتانسیل اسمزی صفر، 2-، 4-، 6-، 8-، 10- و 12- بار بود که به ترتیب با استفاده از محلول پلی اتیلن گلیکول و کلرید سدیم اعمال شد. نتایج نشان داد که با افزایش سطوح تنش خشکی و شوری، درصد جوانهزنی کاهش پیدا کرد بطوریکه در سطح خشکی و شوری 12- بار، درصد جوانهزنی به ترتیب به صفر و 50 درصد کاهش یافت. تنشهای خشکی و شوری به ترتیب از سطوح 2- و 8- بار به بالا سرعت جوانهزنی را بطور معنیداری در مقایسه با بذور شاهد کاهش دادند. همچنین تنشهای خشکی و شوری باعث کاهش معنی دار طول ریشهچه و ساقهچه و وزن خشک ریشهچه، ساقهچه و کل شدند. مقادیر طول ساقهچه با افزایش سطح تنش شوری به 10- و 12- بار، به ترتیب 42 و 67 درصد در مقایسه با بذور شاهد کاهش یافتند. محتوای پرولین تحت تأثیر تنش های خشکی و شوری افزایش یافت ولی مقادیر پرولین در تنش خشکی در مقایسه با تنش شوری بیشتر بود. نتایج حاصل از این تحقیق نشان داد که تحمل به شوری گیاه مینا چمنی در مرحله جوانهزنی در مقایسه با تنش خشکی بیشتر است. | ||
کلیدواژهها | ||
پلی اتیلن گلیکول؛ درصد جوانهزنی؛ سرعت جوانهزنی؛ کلرید سدیم | ||
مراجع | ||
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