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نقش سایه در تعدیل عوارض ناشی از تنش خشکی بر فیزیولوژی نونهال بنه (Pistacia atlantica) | ||
| تحقیقات جنگل و صنوبر ایران | ||
| مقاله 15، دوره 25، شماره 2 - شماره پیاپی 68، تیر 1396، صفحه 332-341 اصل مقاله (313.21 K) | ||
| نوع مقاله: علمی- پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijfpr.2017.111780 | ||
| نویسندگان | ||
| محمدحسین صادقزاده حلاج1؛ داوود آزادفر* 2؛ حسین میرزایی ندوشن3؛ محمدحسین ارزانش4؛ مسعود توحیدفر5 | ||
| 1دانشجوی دکتری جنگلشناسی و اکولوژی جنگل، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران | ||
| 2دانشیار، گروه جنگلشناسی و اکولوژی جنگل، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران | ||
| 3استاد پژوهش، مؤسسه تحقیقات جنگلها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران | ||
| 4استادیار پژوهش، بخش تحقیقات خاک و آب، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان گلستان، سازمان تحقیقات، آموزش و ترویج کشاورزی، گرگان، ایران | ||
| 5دانشیار پژوهش، گروه مهندسی بیوتکنولوژی، دانشکده مهندسی انرژی و فناوریهای نوین، دانشگاه شهید بهشتی، تهران، ایران | ||
| چکیده | ||
| این پژوهش با هدف بررسی نقش سایه در تعدیل عوارض ناشی از تنش خشکی بر فیزیولوژی نونهالهای بنه (Pistacia atlantica Desf.) در تابستان 1395 و در ایستگاه تحقیقات البرز کرج انجام شد. نونهالهای بنه در شرایط تیمارهای تنش خشکی (در سه سطح فاقد تنش، تنش متوسط و تنش شدید) و سایبان مصنوعی (در سه سطح فاقد سایه، سایه کم و سایه متوسط) در قالب طرح کرتهای خردشده با پایه بلوکهای کامل تصادفی قرار گرفتند. پس از گذشت یک ماه، مشخصههای فیزیولوژی برگ شامل محتوای نسبی آب، محتوای قندهای محلول و پرولین، غلظت رنگیزههای گیاهی، فعالیت آنزیم کاتالاز و نرخ نشت الکترولیت اندازهگیری شدند. تنش خشکی باعث کاهش شدید محتوای نسبی آب و غلظت کلروفیل کل، a و b برگ شد. در مقابل، سایه با تعدیل تنش خشکی، مقدار مشخصههای مذکور را بهطور معنیداری افزایش داد. تنش خشکی باعث تحریک مکانسیمهای مقاومت در نونهالهای بنه شد و محتوای پرولین، کاروتنوئید و فعالیت آنزیم کاتالاز افزایش معنیداری پیدا کردند، اما سایه باعث کاهش معنیدار این مشخصهها و همچنین نسبت کلروفیل a/b شد. برهمکنش سایه و تنش خشکی بر مشخصههای کلروفیل a و فعالیت آنزیم کاتالاز معنیدار بود و تیمارهای تنش خشکی پاسخهای متفاوتی به سایه نشان دادند. بهطور کلی، نتایج این پژوهش حاکی از نقش مثبت سایه در تعدیل تنش خشکی بر نونهالهای بنه بود. | ||
| کلیدواژهها | ||
| اسمولیتها؛ تنش فتواکسیداتیو؛ رنگیزهها؛ کلروفیل | ||
| عنوان مقاله [English] | ||
| Shade role in facilitation drought stress symptoms on physiology of mount Atlas mastic (Pistacia atlantica Desf.) seedlings | ||
| نویسندگان [English] | ||
| Mohammad Hossein Sadeghzadeh Hallaj1؛ Davoud Azadfar2؛ Hossein Mirzaei Nodoushan3؛ Mohammad Hossein Arzanesh4؛ Masoud Tohidfar5 | ||
| 1Ph.D. Student Slilviculture and Forest Ecology, Faculty of Forest Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran | ||
| 2Associate Prof., Department of Silviculture and Forest Ecology, Faculty of Forest Sciences, Grogan University of Agricultural Sciences and Natural Resources, Gorgan, Iran | ||
| 3Prof., Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran | ||
| 4Assistant Prof., Research Division of Soil and Water, Golestan Agricultural and Natural Resources Research and Education Center, AREEO, Gorgan, Iran | ||
| 5Associate Prof., Department of Biotechnology Engineering, Faculty of New Technologies and Energy Engineering, Shahid Beheshti University, Tehran, Iran | ||
| چکیده [English] | ||
| This investigation was carried out in Albroz research station complex (Karaj, Iran) during 2014 summer. Mount Atlas mustic (Pistacia atlantica Desf.) seedlings were treated by drought (moderate, sever and without drought stress) and shading (low, moderate and without shade) factors in a split plot experiment based on a randomized complete block design. After one month, physiological characteristics of leaves including RWC, soluble sugars, proline and pigments content, catalase enzyme activity and ion leakage were studied. Drought stress caused severe decrease in RWC and a, b and total chlorophyll contents. In contrast, shade by ameliorating drought stress significantly increased these parameters. Drought induced tolerance mechanisms in saplings and increased proline and carotenoid content while shade decreased these parameters significantly as well as a to b chlorophyll ratio. Interaction of drought and shade was significant for a chlorophyll and catalase activity, suggested that, drought treatments showed different responses to shade. Overall, results revealed positive effect of shade on drought induced saplings. | ||
| کلیدواژهها [English] | ||
| chlorophyll, osmolites, photoxidative stress, pigments | ||
| مراجع | ||
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