fa مقایسه کارآیی منابع مختلف آهن بر رشد و ویژگی‌های فیزیولوژیک کاهو پژوهشي Research <p align="right"><strong><span lang="FA" style="FONT-FAMILY: Lotus FONT-SIZE: 11pt mso-fareast-font-family: 'Times New Roman' mso-bidi-language: FA mso-no-proof: yes mso-ansi-font-size: 9.0pt mso-ascii-font-family: 'Times New Roman Bold' mso-hansi-font-family: 'Times New Roman Bold' mso-ansi-language: EN-US mso-fareast-language: EN-US" dir="rtl">به منظور بررسی اثر منابع متفاوت آهن تحت شرایط تنش بی</span><span dir="ltr"></span><span lang="FA" style="FONT-FAMILY: Lotus FONT-SIZE: 11pt mso-fareast-font-family: 'Times New Roman' mso-bidi-language: FA mso-no-proof: yes mso-ansi-font-size: 9.0pt mso-ascii-font-family: 'Times New Roman Bold' mso-hansi-font-family: 'Times New Roman Bold' mso-ansi-language: EN-US mso-fareast-language: EN-US"><span dir="ltr"></span>‎<font face="Lotus"><font size="3"><span dir="rtl">کربنات سدیم بر عملکرد گیاه کاهو، یک آزمایش گلخانه</span><span dir="ltr"></span><span dir="ltr"></span></font>‎<span dir="rtl"><font size="3">ای با دو فاکتور شامل منبع آهن در سه شکل (</font></span></font></span><span style="FONT-FAMILY: "Times New Roman Bold","serif" FONT-SIZE: 9pt mso-fareast-font-family: 'Times New Roman' mso-bidi-font-family: Lotus mso-bidi-language: FA mso-no-proof: yes mso-bidi-font-size: 10.0pt mso-ansi-language: EN-US mso-fareast-language: EN-US">Fe-EDDHA</span><span dir="rtl"></span><span lang="FA" style="FONT-FAMILY: Lotus FONT-SIZE: 11pt mso-fareast-font-family: 'Times New Roman' mso-bidi-language: FA mso-no-proof: yes mso-ansi-font-size: 9.0pt mso-ascii-font-family: 'Times New Roman Bold' mso-hansi-font-family: 'Times New Roman Bold' mso-ansi-language: EN-US mso-fareast-language: EN-US" dir="rtl"><span dir="rtl"></span>، نانوکلات آهن و نانوفرتایل) و بی</span><span dir="ltr"></span><span lang="FA" style="FONT-FAMILY: Lotus FONT-SIZE: 11pt mso-fareast-font-family: 'Times New Roman' mso-bidi-language: FA mso-no-proof: yes mso-ansi-font-size: 9.0pt mso-ascii-font-family: 'Times New Roman Bold' mso-hansi-font-family: 'Times New Roman Bold' mso-ansi-language: EN-US mso-fareast-language: EN-US"><span dir="ltr"></span>‎<font face="Lotus"><font size="3"><span dir="rtl">کربنات سدیم در سه سطح (صفر، 5 و 10 میلی</span><span dir="ltr"></span><span dir="ltr"></span></font>‎<font size="3"><span dir="rtl">مولار) با سه تکرار انجام پذیرفت. پس از سه هفته رشد، دانهال</span><span dir="ltr"></span><span dir="ltr"></span></font>‎<font size="3"><span dir="rtl">ها به مدت 30 روز تحت تأثیر تیمار بی</span><span dir="ltr"></span><span dir="ltr"></span></font>‎<font size="3"><span dir="rtl">کربنات سدیم قرار گرفتند. نتایج نشان داد که وزن خشک اندام هوایی و ریشه با افزایش غلظت بی</span><span dir="ltr"></span><span dir="ltr"></span></font>‎<font size="3"><span dir="rtl">کربنات سدیم به طور معنی</span><span dir="ltr"></span><span dir="ltr"></span></font>‎<font size="3"><span dir="rtl">داری کاهش یافت. در پاسخ به افزایش بی</span><span dir="ltr"></span><span dir="ltr"></span></font>‎<span dir="rtl"><font size="3">کربنات سدیم، محتوای کلروفیل </font></span></font></span><span style="FONT-FAMILY: "Times New Roman Bold","serif" FONT-SIZE: 9pt mso-fareast-font-family: 'Times New Roman' mso-bidi-font-family: Lotus mso-bidi-language: FA mso-no-proof: yes mso-bidi-font-size: 10.0pt mso-ansi-language: EN-US mso-fareast-language: EN-US">a</span><span dir="rtl"></span><span lang="FA" style="FONT-FAMILY: Lotus FONT-SIZE: 11pt mso-fareast-font-family: 'Times New Roman' mso-bidi-language: FA mso-no-proof: yes mso-ansi-font-size: 9.0pt mso-ascii-font-family: 'Times New Roman Bold' mso-hansi-font-family: 'Times New Roman Bold' mso-ansi-language: EN-US mso-fareast-language: EN-US" dir="rtl"><span dir="rtl"></span>، کلروفیل </span><span style="FONT-FAMILY: "Times New Roman Bold","serif" FONT-SIZE: 9pt mso-fareast-font-family: 'Times New Roman' mso-bidi-font-family: Lotus mso-bidi-language: FA mso-no-proof: yes mso-bidi-font-size: 10.0pt mso-ansi-language: EN-US mso-fareast-language: EN-US">b</span><span dir="rtl"></span><span lang="FA" style="FONT-FAMILY: Lotus FONT-SIZE: 11pt mso-fareast-font-family: 'Times New Roman' mso-bidi-language: FA mso-no-proof: yes mso-ansi-font-size: 9.0pt mso-ascii-font-family: 'Times New Roman Bold' mso-hansi-font-family: 'Times New Roman Bold' mso-ansi-language: EN-US mso-fareast-language: EN-US" dir="rtl"><span dir="rtl"></span> و حداکثر بازدهی محصول کوانتومی فتوسیستم </span><span style="FONT-FAMILY: "Times New Roman Bold","serif" FONT-SIZE: 9pt mso-fareast-font-family: 'Times New Roman' mso-bidi-font-family: Lotus mso-bidi-language: FA mso-no-proof: yes mso-bidi-font-size: 10.0pt mso-ansi-language: EN-US mso-fareast-language: EN-US">II</span><span dir="rtl"></span><span lang="FA" style="FONT-FAMILY: Lotus FONT-SIZE: 11pt mso-fareast-font-family: 'Times New Roman' mso-bidi-language: FA mso-no-proof: yes mso-ansi-font-size: 9.0pt mso-ascii-font-family: 'Times New Roman Bold' mso-hansi-font-family: 'Times New Roman Bold' mso-ansi-language: EN-US mso-fareast-language: EN-US" dir="rtl"><span dir="rtl"></span> (</span><span style="FONT-FAMILY: "Times New Roman Bold","serif" FONT-SIZE: 9pt mso-fareast-font-family: 'Times New Roman' mso-bidi-font-family: Lotus mso-bidi-language: FA mso-no-proof: yes mso-bidi-font-size: 10.0pt mso-ansi-language: EN-US mso-fareast-language: EN-US">F_v/F_m</span><span dir="rtl"></span><span lang="FA" style="FONT-FAMILY: Lotus FONT-SIZE: 11pt mso-fareast-font-family: 'Times New Roman' mso-bidi-language: FA mso-no-proof: yes mso-ansi-font-size: 9.0pt mso-ascii-font-family: 'Times New Roman Bold' mso-hansi-font-family: 'Times New Roman Bold' mso-ansi-language: EN-US mso-fareast-language: EN-US" dir="rtl"><span dir="rtl"></span>)در تمام منابع آهن کاهش نشان دادند. این در حالی بود که کمترین کاهش این ویژگی­ها در گیاهانی رخ داد که با کود آهن </span><span style="FONT-FAMILY: "Times New Roman Bold","serif" FONT-SIZE: 9pt mso-fareast-font-family: 'Times New Roman' mso-bidi-font-family: Lotus mso-bidi-language: FA mso-no-proof: yes mso-bidi-font-size: 10.0pt mso-ansi-language: EN-US mso-fareast-language: EN-US">Fe-EDDHA</span><span dir="rtl"></span><span lang="FA" style="FONT-FAMILY: Lotus FONT-SIZE: 11pt mso-fareast-font-family: 'Times New Roman' mso-bidi-language: FA mso-no-proof: yes mso-ansi-font-size: 9.0pt mso-ascii-font-family: 'Times New Roman Bold' mso-hansi-font-family: 'Times New Roman Bold' mso-ansi-language: EN-US mso-fareast-language: EN-US" dir="rtl"><span dir="rtl"></span> تغذیه شده بودند. تنش بی‎کربنات سدیم باعث کاهش معنی‎دار غلظت آهن در اندام هوایی و ریشه گردید. به طوری که میزان آهن در اندام هوایی گیاهان، در غلظت 10 میلی‎مولار بی‎کربنات سدیم، در تیمار نانوفرتایل، 88/64 درصد نسبت به شاهد کاهش نشان داد. با توجه به نتایج به‏دست آمده، </span><span style="FONT-FAMILY: "Times New Roman Bold","serif" FONT-SIZE: 9pt mso-fareast-font-family: 'Times New Roman' mso-bidi-font-family: Lotus mso-bidi-language: FA mso-no-proof: yes mso-bidi-font-size: 10.0pt mso-ansi-language: EN-US mso-fareast-language: EN-US">Fe-EDDHA</span><span dir="rtl"></span><span lang="FA" style="FONT-FAMILY: Lotus FONT-SIZE: 11pt mso-fareast-font-family: 'Times New Roman' mso-bidi-language: FA mso-no-proof: yes mso-ansi-font-size: 9.0pt mso-ascii-font-family: 'Times New Roman Bold' mso-hansi-font-family: 'Times New Roman Bold' mso-ansi-language: EN-US mso-fareast-language: EN-US" dir="rtl"><span dir="rtl"></span> به­دلیل حلالیت و فراهمی بیشتر در محلول، دارای قابلیت بیشتری برای جذب توسط کاهو بوده که در نتیجه موجب افزایش رشد کاهو شد. بنابراین، با توجه به اهمیت آهن در تغذیه گیاه، مصرف کود </span><span style="FONT-FAMILY: "Times New Roman Bold","serif" FONT-SIZE: 9pt mso-fareast-font-family: 'Times New Roman' mso-bidi-font-family: Lotus mso-bidi-language: FA mso-no-proof: yes mso-bidi-font-size: 10.0pt mso-ansi-language: EN-US mso-fareast-language: EN-US">Fe-EDDHA</span><span dir="rtl"></span><span style="FONT-FAMILY: Lotus FONT-SIZE: 11pt mso-fareast-font-family: Calibri mso-bidi-language: FA mso-no-proof: yes mso-ansi-font-size: 9.0pt mso-ascii-font-family: 'Times New Roman Bold' mso-hansi-font-family: 'Times New Roman Bold' mso-ansi-language: EN-US mso-fareast-language: EN-US" dir="rtl"><span dir="rtl"></span> </span><span lang="FA" style="FONT-FAMILY: Lotus FONT-SIZE: 11pt mso-fareast-font-family: 'Times New Roman' mso-bidi-language: FA mso-no-proof: yes mso-ansi-font-size: 9.0pt mso-ascii-font-family: 'Times New Roman Bold' mso-hansi-font-family: 'Times New Roman Bold' mso-ansi-language: EN-US mso-fareast-language: EN-US" dir="rtl">در شرایط قلیائیت بهترین منبع تأمین آهن برای کاهو شناخته شد</span></strong></p> In order to investigate the effect of different iron (Fe) sources on lettuce yield, under the sodium bicarbonate stress conditions, a greenhouse experiment was carried out with two factors including Fe source in three forms (Fe-EDDHA, Fe nano chelate and nanofertile) and sodium bicarbonate at three levels (0, 5, and 10 mM) with three replications. Three weeks after transplanting, seedlings were treated with sodium bicarbonate for 30 days. Results showed that dry weight of shoot and root decreased significantly by elevating the sodium bicarbonate concentration in nutrient solution. In response to higher sodium bicarbonate concentrations, chlorophyll a, b and maximal quantum yield of PSII photochemistry (Fv/Fm) decreased in all Fe treatments, while, the lowest reduction of these parameters was observed in plants grown with Fe-EDDHA. Sodium bicarbonate stress caused a reduction in Fe concentration of leaves and roots, such that at 10 mM sodium bicarbonate concentration, and nanofertile Fe source, Fe content in shoots decreased 64.88% as compared to control. Based on the obtained results, the Fe-EDDHA, due to its higher solubility and availability, has more potential to be absorbed by lettuce, and for this reason, increased growth of the lettuce. Therefore, due to the importance of Fe in nutrition of plants, application of Fe-EDDHA under alkali conditions is the best source of Fe supply for lettuce قلیائیت, کلات آهن, عناصر غذایی Alkalinity, Fe-chelate, Mineral nutrients 41 49 http://jspi.iut.ac.ir/browse.php?a_code=A-10-1-33&slc_lang=fa&sid=1 M Manzari Tavakoli میثم منظری توکلی No Dept. of Hort. Sci., College of Agric., Vali-e-Asr Univ., Rafsanjan, Iran گروه علوم باغبانی، دانشکده کشاورزی، دانشگاه ولی عصر(عج) رفسنجان، رفسنجان V Bagheri واحد باقری vahed1360@yahoo.com Yes Dept. of Hort. Sci., College of Agric., Vali-e-Asr Univ., Rafsanjan, Iran گروه علوم باغبانی، دانشکده کشاورزی، دانشگاه ولی عصر(عج) رفسنجان، رفسنجان H.R Roosta حمیدرضا روستا No Dept. of Hort. Sci., College of Agric., Vali-e-Asr Univ., Rafsanjan, Iran گروه علوم باغبانی، دانشکده کشاورزی، دانشگاه ولی عصر(عج) رفسنجان، رفسنجان