تأثیر تنش شوری بر صفات رویشی، ریختی و فیزیولوژیکی نهال‌های استبرق (.Calotropis procera Ait) | ||
| خشک بوم | ||
| مقاله 3، دوره 8، شماره 1، شهریور 1397، صفحه 27-35 اصل مقاله (364.34 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.29252/aridbiom.8.1.27 | ||
| نویسندگان | ||
| محمد بهمنی1؛ داود کرتولی نژاد* 2 | ||
| 1دانش آموخته کارشناسی ارشد دانشگاه تربیت مدرس، مازندران، نور، ایران | ||
| 2استادیار گروه جنگلداری مناطق خشک، دانشکده کویرشناسی، دانشگاه سمنان | ||
| چکیده | ||
| تحقیق حاضر با هدف بررسی اثر تنش آب شور بر صفات رویشی و فیزیولوژی نهال استبرق در شرایط گلخانه انجام شد. آزمایش در 6 سطح شوری (0، 5، 10، 15، 20 و 25 دسی زیمنس بر متر) در قالب طرح پایه کاملاً تصادفی به مدت 5 ماه صورت گرفت. درصد زندهمانی نهال‌های استبرق در شوریهای 0، 5، 10 و 15 دسی زیمنس بر متر به ترتیب 100، 100، 6/64 و 6/22 بود؛ اما در سطوح 20 و 25 دسی زیمنس بر متر هیچ نهالی زنده نماند. بزرگ‌ترین میزان طول و حجم ریشه در تیمار شاهد دیده شد. بیشترین مقادیر فتوسنتز، هدایت روزنهای، تعرق، وزن تر و خشک ساقه و ریشه، ارتفاع نهال، قطر یقه و تعداد برگ به تیمار شاهد تعلق داشت. بالاترین میزان دمای سطح و نسبت ریشه/ساقه به ترتیب در شوریهای 15 و 25 دسی زیمنس بر متر دیده شد. به‌طورکلی، یافته های این پژوهش آشکار ساخت که در شرایط مورد مطالعه، نهال‌های 5 ماهه استبرق اگرچه در شوری 15 دسی زیمنس بر متر امکان زیست ضعیفی دارند، اما به شوری 10 دسی زیمنس بر متر سازگاری نسبتاً خوبی از نظر اغلبِ ویژگیهای رویشی، فیزیولوژیکی و زندهمانی نشان میدهند. | ||
| کلیدواژه‌ها | ||
| استبرق؛ سطوح شوری؛ نشت الکترولیت؛ زندهمانی نهال؛ فتوسنتز | ||
| عنوان مقاله [English] | ||
| Effect of salinity stress on growth, morphological and physiological characteristics of Milkweed (Calotropis procera Ait.) seedlings | ||
| نویسندگان [English] | ||
| M. Bahmani1؛ D. Kartoolinejad2 | ||
| 1M.Sc.Graduate Student of Tarbiat Modares University, Tehran, Iran | ||
| 2Department of Arid Lands Forestry, Faculty of Desert Studies, Semnan University, Semnan, Iran | ||
| چکیده [English] | ||
| This study aimed to investigate effect of saline water stress on growth and physiological characteristics of Calotropis procera seedling in greenhouse conditions. Experiment was performed at six salinity levels (0, 5, 10, 15, 20 and 25 dS/m) in a completely randomized design for 5 months. Survival percentage of milkweed seedlings at salinity levels of 0, 5, 10 and 15 dS/m was 100, 100, 64/6 and 22/6, respectively; however, at 20 and 25 dS/m seedlings did not survive. Maximum rate of root length and volume were observed at control treatment. Maximum rates of photosynthesis, stomatal conductance, transpiration, shoot and root dry weight, seedling height, collar diameter and number of leaves were belonged to control treatment. Maximal level of leaf temperature and root/shoot ratio were observed at salinity 15 and 25 dS/m, respectively. Totally, findings of this study revealed that five month seedlings of milkweed have poor viability at salinity conditions of 15 dS/m, although at salinity of 10 dS/m showed fairly well adaptation from the many growth and physiological characteristics, and also survival point of view. | ||
| کلیدواژه‌ها [English] | ||
| Milkweed, salinity, Electrolyte leakage, Seedling survival, Photosynthesis | ||
| مراجع | ||
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