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نقش اکوفیزیولوژیکی موسیلاژ سطح بذر در جوانهزنی و رشد گیاهچه بالنگو (Lallemantia royleana) در شرایط تنش خشکی و شوری | ||
| علوم و فناوری بذر ایران | ||
| مقاله 15، دوره 7، شماره 1 - شماره پیاپی 13، مرداد 1397، صفحه 201-211 اصل مقاله (620.57 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22034/ijsst.2018.107993.1013 | ||
| نویسندگان | ||
| محمود رضا بهرامی1؛ محمد خواجه حسینی* 2؛ کامران داوری2 | ||
| 1مدرس دانشگاه | ||
| 2عضو هیئت علمی دانشگاه فردوسی | ||
| چکیده | ||
| به نظر میرسد تولید موسیلاژ در سطح پوسته بذر یکی از جنبههای تطابق پذیری گیاهان به شرایط محیطی بیابانی باشد. دانه بالنگو شیرازی (Lallemantia royleana) به دلیل وجود موسیلاژ در پوسته بذر قدرت فوقالعادهای در جذب آب تا چندین برابر حجم اولیه خود را دارد. به منظور تعیین نقش موسیلاژ در جوانهزنی، دو نوع بذر موسیلاژدار و بدون موسیلاژ در آزمایشهای جداگانه تنش خشکی (صفر ، 0.1-، 0.2-، 0.3-، 0.4-، و 0.5- مگا پاسکال) و تنش شوری (صفر، 2، 4، 6، 8، و 10 دسی زیمنس بر متر) بصورت آزمایش فاکتوریل در قالب طرح آماری کاملاً تصادفی با سه تکرار بررسی شد. در آزمایش تنش خشکی درصد جوانهزنی بذر موسیلاژدار با اختلاف معنی داری کمتر از بذر بدون موسیلاژ بود اما در آزمایش شوری اختلاف درصد جوانهزنی آنها معنی داری نبود. متوسط زمان جوانهزنی(MGT ) بذر موسیلاژدار در هر دو آزمایش پائینتر از بذر بدون موسیلاژ بود. در آزمایش شوری طول ریشهچه، ساقه چه، نسبت طول ریشهچه به ساقه چه،و وزن خشک گیاهچه بذر موسیلاژدار بطور معنی داری بالاتر از بذر بدون موسیلاژ بود اما در آزمایش خشکی اختلافی بین آنها وجود نداشت. بود. اثر متقابل خشکی و نوع بذر معنی دار نبود اما تنش شوری و نوع بذر اثر متقابل معنی داری داشتند. | ||
| کلیدواژهها | ||
| تنش؛ پتانسیل اسمزی؛ جذب آب؛ MGT | ||
| عنوان مقاله [English] | ||
| Ecophysiological role of mucilaginous seed coat on germination and seedling growth of Balangu (Lallemantia royleana) imposed to drought and salinity stress | ||
| نویسندگان [English] | ||
| mahmood reza Bahrami1؛ Mohammad Khajeh-Hosseini2؛ | ||
| چکیده [English] | ||
| It seems mucilaginous seed coat is an aspect of plants evolutionary adaptation to desert environments. Because of mucilage production, seed coat of Balangu Shirazi (Lallemantia royleana) absorbs water multiple times more than of its initial weight. To determine the possible role of mucilaginous seed coat, two mucilaginous (M) and demucilaged (DM) seeds were examined in two separate experiments of drought with six levels (0 as control, -0.1, -0.2, -0.3, -0.4,and -0.5 MPa) and salinity with six levels (0 as control, 2, 4, 6, 8, and 10 ds.m-1) through factorial experiment as completely randomized design with three replications of 25 seeds. Germination of demucilaged seeds significantly was higher than mucilaginous seed in drought trial; though in salinity stress, there was no significant difference between germination of mucilaginous and demucilaged seeds. Mean germination time (MGT) in mucilaginous seeds was higher than the demucilaged seeds in both salinity and drought stresses. In salinity experiment, length of root, stem and stem/root length ratio in mucilaginous seed was higher than the demucilaged seed significantly; while there was no any differences in drought stress. Interaction of seed with drought was not significant but there was significant interaction between seed and salinity. | ||
| کلیدواژهها [English] | ||
| Stress, MGT, osmotic potential, water absorption | ||
| مراجع | ||
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