راه¬كارهاي مقابله با تنش¬ شوری و اکسیداتیو در گیاهان زراعي
محورهای موضوعی : آلودگی های محیط زیست (آب، خاک و هوا)
اسماعیل قلی نژاد
1
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رضا درویش زاده
2
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عباس ابهری
3
1 - دانشیار، گروه علمي علوم کشاورزي، دانشگاه پيام نور، تهران، ايران. *(مسوول مکاتبات)
2 - استاد، گروه تولید و ژنتیک گیاهی، دانشکده کشاورزی، دانشگاه اروميه، ارومیه، ايران.
3 - استادیار، گروه علمي علوم کشاورزي، دانشگاه پيام نور، تهران، ايران.
کلید واژه: آنتی اکسیدان, اکسیداتیو, شورزی, شوری, گلیکولیت, نمک.,
چکیده مقاله :
زمینه و هدف: یک چالش بزرگ در کشاورزی جهان تولید محصولات غذایی بیشتر برای 3/2 میلیارد نفر دیگر تا سال 2050 در سراسر جهان است. شوری تنش عمده¬ای است که عرضه محصولات غذایی را محدود می¬کند. مساحت كل زمین¬ها حدود 2/13 ميليارد هكتار است كه 7 ميليارد هكتار از آن قابـل كشت و 5/1 ميليارد هكتار زیر كشت است و حدود 23 درصد از زمین¬های زیر کشت در سراسر جهان (حدود 345 میلیون هکتار) تحت تأثیر تنش شوری قرار دارد و روز به روز بر میزان آن افزوده می¬شود. گیاهان را می‌توان به دو نوع شورزی‌ها و گلیکوفیت‌ها طبقه‌بندی کرد و اکثر گونه¬های زراعی عمده به این دسته دوم تعلق دارند. مقاله حاضر با هدف بررسی پژوهش¬های علمی مرتبط با اثرات، سازوکار¬های تحمل، روش¬های پژوهش، صفات مهم قابل اندازه¬گیری، مدیریت و کنترل تنش شوری و اکسیداتیو در گیاهان زراعي ارائه می¬شود. روش بررسی: مقاله حاضر یک مقاله مروری می¬باشد که با جستجو در مقاله¬های مرتبط در پایگاه¬های معتبر (Google scholar, Web of Science, PubMed, Scopus, SID) بدست آمده است. یافته¬ها: شوری روی خصوصیات مختلف گیاهان مانند صفات فیزیولوژیک، متابولیک، رشد و نمو، جوانه¬زنی، کمیت و کیفیت گیاه تاثیرات نامطلوبی دارد. مهمترین صدمات ناشی از تنش شوري شامل برهم خوردن توازن یونی ناشی از کاهش جذب یون¬هاي ضـروري، انباشتگی یون¬هاي مضر و کم آبی ناشی از کاهش جذب آب می¬باشد که باعث کاهش سنتز پروتئین، تعرق، انتقال یـون و در نهایـت کـاهش عملکرد نهایی می¬شود. از سازوکار¬های تحمل به تنش شوری می¬توان به هوموستازی یونی، انباشت املاح سازگار و حفاظت اسمزی، تنظیم آنتی اکسیدانی، پلی آمین¬ها، اکسید نیتریک و تنظیم هورمونی تحمل به شوری اشاره کرد. در شرایط تنش گونه¬های فعال اکسیژن مانند رادیکال¬های سوپراکسید، اکسیژن منفرد و رادیکال هیدروکسیل تولید می¬شود که باعث صدمه به ساختار سلولی، پروتئین¬ها، غشاء سلولی، کربوهیدرات¬ها، اسیدهای نوکلوئیک و در نهایت مرگ سلول می¬شود. بحث و نتیجه¬گیری: آنتی اکسیدان¬های آنزیمی یا غیر آنزیمی نقش بسیار مهمی در حفاظت گیاهان در مقابله با آسیب¬های اکسیداتیو دارند. سوپر اکسید دیسموتاز، کاتالاز، پروکسیداز، آسکوربات پراکسیداز، گلوتاتیون ردوکتاز از آنتی¬اکسیدان¬های آنزیمی و اسید اسکوریک، گلوتاتیون، کاروتنوئیدها و توکوفرول¬ها از آنتی اکسیدان¬های غیرآنزیمی محسوب می¬شوند که می¬توانند صدمات ناشی از گونه¬های فعال اکسیژن را کاهش دهند.
Background and Objective: A major challenge in global agriculture is to produce more food for another 2.3 billion people by 2050 worldwide. Salinity is a major stress that limits the supply of food products. The total land area is about 13.2 billion hectares, of which 7 billion hectares are arable and 1.5 billion hectares are under cultivation, and about 23% of the cultivated lands around the world (about 345 million hectares) are affected by salinity stress and its amount is increasing day by day. Plants can be classified into two types, halophytes (which can resist salinity) and glycophytes (which cannot resist salinity and eventually die), and most major crops belong to this second category. The purpose of this article is to review scientific research related to the effects, mechanisms of tolerance, research methods, important measurable traits, management and control of salinity and oxidative stress in agricultural plants. Material and Methodology: This article is a review article that was obtained by searching related articles in reliable sites (Google scholar, Web of Science, PubMed, Scopus, SID. Findings: Salinity have adverse effects on various plant characteristics such as physiological, metabolic, growth, germination, strength, quantity and quality of plants. The most important damages caused by salinity stress include ion imbalance due to reduced absorption of necessary ions, accumulation of harmful ions and dehydration due to decreased water absorption which reduces protein synthesis, transpiration, ion transfer and finally decreases seed yield. Mechanisms of salinity stress tolerance include ionic homeostasis, compatible salt accumulation and osmotic protection, antioxidant regulation, polyamines, nitric oxide, and hormonal regulation of salinity tolerance. Under stress, reactive oxygen species such as superoxide radicals, singlet oxygen and hydroxyl radical are produced, which damage cell structure, proteins, cell membranes, carbohydrates, nucleic acids, and eventually cause cell death. Discussion and Conclusion: Enzymatic or non-enzymatic antioxidants play a very important role in protecting plants against oxidative damage. Superoxide dismutase, catalase, peroxidase, ascorbate peroxidase, glutathione reductase are enzymatic antioxidants and ascorbic acid, glutathione, carotenoids and tocopherols are non-enzymatic antioxidants which can reduce the damage caused by reactive oxygen species.
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