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خادمی, زهرا, ملکوتی, محمد جعفر, جونز, دیوی. (1396). اثر اسیدهای آلی ریشه در قابلیت جذب عناصر غذایی در ریزوسفر. سامانه مدیریت نشریات علمی, 21(2), 171-189. doi: 10.22092/ijsr.2018.127085
زهرا خادمی; محمد جعفر ملکوتی; دیوی جونز. "اثر اسیدهای آلی ریشه در قابلیت جذب عناصر غذایی در ریزوسفر". سامانه مدیریت نشریات علمی, 21, 2, 1396, 171-189. doi: 10.22092/ijsr.2018.127085
خادمی, زهرا, ملکوتی, محمد جعفر, جونز, دیوی. (1396). 'اثر اسیدهای آلی ریشه در قابلیت جذب عناصر غذایی در ریزوسفر', سامانه مدیریت نشریات علمی, 21(2), pp. 171-189. doi: 10.22092/ijsr.2018.127085
خادمی, زهرا, ملکوتی, محمد جعفر, جونز, دیوی. اثر اسیدهای آلی ریشه در قابلیت جذب عناصر غذایی در ریزوسفر. سامانه مدیریت نشریات علمی, 1396; 21(2): 171-189. doi: 10.22092/ijsr.2018.127085

اثر اسیدهای آلی ریشه در قابلیت جذب عناصر غذایی در ریزوسفر

پژوهش های خاک
دوره 21، شماره 2، اسفند 1396، صفحه 171-189    اصل مقاله (604.55 K)
نوع مقاله: مقاله پژوهشی
شناسه دیجیتال (DOI): 10.22092/ijsr.2018.127085
نویسندگان
زهرا خادمی* 1؛ محمد جعفر ملکوتی2؛ دیوی جونز3
1استادیار پژوهش مؤسسه تحقیقات خاک و آب
2استاد دانشگاه تربیت مدرس
3استاد خاکشناسی و محیط زیست دانشگاه ولز انگلستان
چکیده
بسیاری از خاکهای ایران در مناطق کشاورزی دارای طبیعت و خصوصیت آهکی و واکنش قلیایی هستند. در بسیاری از مناطق کشور کربنات کلسیم تقریباً 40 درصد از وزن خاکها را تشکیل می‌دهد. pH خاکهای آهکی عمدتاً توسط مقادیر کربنات کلسیم موجود در پروفیل خاک کنترل شده و اغلب بین 5/8-5/7 در نوسان می‌باشد. واکنش کربنات کلسیم در خاکهای آهکی منجر به افزایش pH خاک می شود خصوصاً در مناطقی که میزان بارندگی کم می‌باشد. این واکنشها در افق سطحی خاکهای آهکی حلالیت و جذب بسیاری از عناصر را مانند P، Zn، Mn، Cu و Fe محدوده نموده بعلاوه در رشد گیاه و ریشه هم اختلال ایجاد می کند و در نهایت باعث کاهش عملکرد می‌گردد مگر اینکه مقادیر زیادی کودهای شیمیایی مصرف شود. بنابراین حلالیت و قابلیت جذب اندک عناصر غذایی در خاکهای آهکی توجه بسیاری از دانشمندان علم تغذیه را با توجه به هزینه‌ بالای کودهای شیمیایی، محیط زیست و سلامت جامعه به خود معطوف نموده است. مطالعات بسیاری نشان داده است که در خاکهای آهکی اسیدهای آلی حاصل از ترشحات ریشه گیاه می توانند به عنوان عامل موثر بر استخراج بخش قابل توجهی از عناصر غذایی مورد نیاز گیاه عمل نمایند و راندمان مصرف کود و آب را در این خاکها بهبود ببخشند. هدف اصلی از تهیه این مقاله معرفی اسیدهای آلی و جلب دیدگاههای جامعه علمی کشور به ویژه متخصصین علم تغذیه گیاه و حاصلخیزی خاک به نقش اسیدهای آلی مانند سیترات و اگزالات (که از ترکیبات آلی با وزن مولکولی کم می‌باشند و از ریشه گیاه در ریزوسفر ترشح می‌شوند) در افزایش حلالیت و قابل جذب نمودن عناصر غذایی کم محلول مانند فسفر، آهن، روی و انجام فعالیتهای پژوهشی متخصصین تغذیه گیاهی در این زمینه می‌باشد. در این مقاله تحقیقات انجام گرفته در گذشته و حال در مورد رفتار اسیدهای آلی در گیاه و خاک به صورت خلاصه مورد بررسی قرار گرفته است تا اهمیت و نقش آنها در ریزوسفر ارزیابی شود. ریزوسفر منطقه‌ای از خاک است که بلافاصله ریشه گیاه را احاطه کرده و در اثر فعالیت‌های ریشه و ویژگیهای اکولوژیکی آن تغییر می‌یابد. در این منطقه حساس گیاهان‌ به محیطشان واکنش نشان می‌دهند. در شرایطی که گیاه دارای رشد و نمو معمول می‌باشد، مقدار فراوانی از مواد معدنی و آلی بین ریشه و خاک مبادله می‌گردد که به طور اجتناب‌ناپذیری منجر به تغییراتی در خصوصیات فیزیکی و شیمیایی ریزوسفر می‌شود. گیاهان همچنین در واکنش به محیط و تنش‌های مشخص محیطی قادر هستند در ریزوسفرتغییراتی ایجاد نمایند. اسیدهای آلی معمولاً از این منطقه بدست می‌آیند و ترشح آنها از ریشه‌های گیاه به کمبود عناصر غذایی و تنش‌‌های محیطی ارتباط پیدا می‌کند. اسیدهای آلی مانند سیترات (citrate)، اگزالات (oxalate) و مالات (malate) در بسیاری از فرآیندهای ریشه شرکت می‌کنند که این فرآیندها شامل استخراج عناصر غذایی، سمیت‌زدایی فلزی، هوازدگی مینرالی و جذب پاتوژن‌ها می‌باشد. البته تا زمانی که مکانیسم رهاسازی اسیدهای آلی و سرنوشت این ترکیبات در خاک کاملاً درک نشود، ارزیابی کامل نقش اسیدهای آلی در فرآیندهای یاد شده مقدور نخواهد بود. بنابراین بررسی حاضر شامل اطلاعاتی در زمینه غلظت و تجمع اسیدهای آلی در گیاهان، واکنش خاک، جذب (sorption) و تجزیه میکروبی (biodegradation) می‌باشد. بطور خلاصه، رهاسازی اسیدهای آلی از ریشه‌ها در پاسخ به تعدادی از تنش‌های محیطی مانند کمبود فسفر و کمبود آهن مشخص شده است که البته نوع گونه گیاهی در این واکنش‌ها نقش مهمتری دارند. از طرفی در این بررسی جذب (sorption) اسیدهای آلی توسط مینرالهای خاک و نیز تجزیه میکروبی آنها نقش بسیار اساسی در کارآیی اسیدهای آلی در فرآیندهای ریزوسفر دارند.
کلیدواژه‌ها
اسیدهای آلی؛ ریزوسفر؛ ترشح ریشه؛ عناصر غذایی
عنوان مقاله [English]
Rhizosphere Organic Acids and Nutrient Availability
نویسندگان [English]
Z. Khademi1؛ M. J. Malakouti2؛ D. L. Jones3
1Assistant Professor, Soil and Water Research Institute
2Professor, Tarbiat Modarres University
3Professor, Wales University, UK
چکیده [English]
The principle objective of this review article is to present to plant nutrition specialists some interesting aspects of the role of organic acids in improving the availability of nutrient elements in calcareous soils in order to promote more research in this area. The rhizosphere is the zone of soil immediately surrounding plant roots that is modified by root activity. In this critical zone, plants respond to their environment. As a consequence of normal growth and development, a large range of organic and inorganic substances are exchanged between the root and soil, which inevitably leads to changes in the biochemical and physical properties of the rhizosphere. Plants also modify their rhizosphere in response to certain environmental signals and stresses. Organic anions are commonly detected in this region, and their exudation form plant roots have now been associated with nutrient deficiencies and inorganic ion stresses. Organic acids such as citrate, oxalate and malate are active in many of the roots natural processes including nutrient absorption, reducing metal toxicity, mineral weathering and pathogens attraction. A full assessment of their role in these processes, however, cannot be determined unless the exact mechanisms of plant organic acid release and fate of these compounds in the soil are more fully understood. This review therefore, includes information on organic acid levels in plants, soil reactions (soil solution concentration, sorption) and microbial considerations (mineralization). In summary, the release of organic acids from roots can operate by multiple mechanisms in response to a number of well-defined environmental stresses (e.g., P and Fe stress). These responses, however, are high stress and plant-species specific. In addition, this review indicates that the sorption of organic acids to the mineral phase and mineralization by the soils microbial biomass are critical to determining the effectiveness of organic acids in most rhizophere processes.
کلیدواژه‌ها [English]
Organic acids, Rhizosphrer, Root exudates, Nutrient elements
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