بررسی اثر محلول‌پاشی جیبرلیک اسید تحت شرایط کم‌آبیاری بر خصوصیات فیزیکی، شیمیایی و انبارمانی میوه انار (رقم شهوار)

نوع مقاله : مقالات پژوهشی

نویسندگان

• یحیی سلاح ورزی ¹
• ذبیح اله زمانی ²
• علیرضا طلایی ¹
• محمدرضا فتاحی مقدم نوقابی ³

¹ دانشگاه تهران

² تهران

³ کرج

https://doi.org/10.22067/jhorts4.v30i2.48204

چکیده

انار محصولی بومی ایران بوده که از ارزش صادراتی بالایی نیز برخوردار است. بحران خشکسالی در منطقه و خصوصاً حاشیه کویر که مورد کشت و کار انار قرار می‌گیرد به صورت فزاینده‌ای رو به گسترش می‌باشد. بدین سبب تحقیق حاضر در سال 1393 با سه سطح آبیاری شامل شاهد (ETc100 درصد)، کم‌آبیاری پایدار (ETc50 درصد در کل فصل رشد)، کم‌آبیاری تنظیم شونده (قطع آبیاری تا زمان تشکیل میوه و آبیاری کامل پس از آن) و دو غلظت محلول‌پاشی جیبرلیک اسید (0 و 150 پی‌پی‌ام) با 4 تکرار روی درختان 7 ساله انار رقم شهوار در شهرستان تربت حیدریه به صورت آزمایش اسپلیت پلات بر پایه طرح کاملاً تصادفی انجام شد. پس از اندازه‌گیری عملکرد و اجزای آن، تعدادی میوه انار از هر تیمار به انبار سرد (دمای 5 درجه سانتی‌گراد و رطوبت نسبی 85 درصد) منتقل و طی فواصل زمانی 9 و 18 هفته مورد ارزیابی کیفی قرار گرفتند. نتایج نشان داد که وزن میوه، عملکرد کل، درصد آریل و آب میوه انار در تیمار کم‌آبیاری تنظیم شونده به ترتیب 6/39، 1/17، 9/7 و 6/16 درصد در مقایسه با شاهد بیشتر شد. از سوی دیگر هر چند تیمار کم‌آبیاری پایدار بیشترین میزان ترکیدگی (1/9 درصد) و کمترین وزن میوه (8/205 گرم) را نشان داد، اما محلول‌پاشی GA3 توانست ضمن افزایش نسبی وزن،‌ از شدت عارضه ترکیدگی نیز بکاهد. بررسی خصوصیات فیزیوشیمیایی میوه ها طی دوره انبارمانی نیز نشان از برتری تیمار کم‌آبیاری تنظیم شونده برای صفات شاخص رسیدگی، فعالیت آنتی‌اکسیدانی، آنتوسیانین کل و شاخص سرمازدگی داشت. همچنین تیمار محلول‌پاشی GA3 توانست کاهش وزن میوه‌های حاصل از تیمارهای کم‌آبیاری را طی دوره انبارمانی اصلاح نماید و مقادیر آنتوسیانین کل و فعالیت آنتی‌اکسیدانی را نیز افزایش دهد. لذا به نظر می‌رسد با توجه به محدودیت منابع آبی در شرایط موجود، اتخاذ برخی راهکارهای کم‌آبیاری می‌تواند نتایج رضایت بخشی را در پی داشته باشد. ضمن آن‌که کاربرد GA3 نیز توانایی جبران و اصلاح بخشی از اثرات نامطلوب این تیمارها را دارد.

کلیدواژه‌ها

• آنتوسیانین کل
• ترکیدگی میوه
• قطع آبیاری
• عملکرد
• نیاز آبی

20.1001.1.20084730.1395.30.2.5.2

عنوان مقاله [English]

Effect of Gibberellic Acid under Deficit Irrigation on Physicochemical and Shelf Life Attributes of Pomegranate Fruit (cv. Shahvar)

نویسندگان [English]

• Yahya Selahvarzi ¹
• Zabihollah Zamani ²
• Ali Reza Talaie ¹
• Mohammadreza Fattahi ³

¹ University of Tehran

²

³

چکیده [English]

Introduction: Pomegranate (Punica granatum L.) belonging to the family Punicaceae, native to subtropical regions of Iran and adapted to arid or semi arid climates with mild winters. Pomegranate is fairly drought tolerant but requires regular irrigation to produce high yield and fruit weight. Large parts of Iran within the boundaries of central deserts (Dasht-e-kavir and Kavir-e-Loot) have arid or semi-arid conditions which make them suitable for pomegranate production. However drought crisis and water resources restriction are very serious in these areas.
Materials and Methods: This experiment was conducted on 7-year old pomegranate cv. Shahvar trees from 2013 to 2014 in Torbat-e-Heydarieh, Razavi Khorasan, Iran. Irrigation treatments and Gibberellic acid application were used in Completely Randomized Split-Plot Design with four replications. Irrigation treatments included [1-control: 100% of estimated crop evapotranspiration (Etc) 2-Sustained deficit irrigation (SDI): watering was constantly used at 50%Etc, and 3-Regulated deficit irrigation (RDI): not watering was imposed until fruit set and then irrigation was applied same as control]. Foliar application of Gibberellic acid was done with two concentrations (0 and 150 ppm) at early May and September. Precipitation and pan evaporation (Ep) was recorded by weather station that located at 15 km distance from the studied orchard. Daily crop reference evapotranspiration (ETo) was estimated by penman-monteith equation. Trees were drip-irrigated by two lateral lines parallel to the tree row and four emitters that each one delivers 4 liters per hour. Fruit weight and numbers, tree production (yield), peel, arils and juice percent and finally fruit cracking of each treatment were determined at ordinary harvest time in late of October. Some uniform and intact fruits per treatment transferred to cold storage (T= 5 ◦C, RH= 85-90%). After storage period the fruits transfered to shelf life condition (7 days at 20 ◦C and RH= 65-70%) to evaluate physiochemical traits at 2 different storage periods (9 and 18 weeks). Weight loss and chilling index were determined during 3 weeks intervals of storage. Weight loss was evaluated by a gravimetric method and results were expressed as percent of initial fresh weight. Chilling index was quantified by 5 point scale of fruit husk injury: (1: without disorder, 2: slight disorder signs 3: moderate signs 4: severe signs and 5: unmarketable).
Results and Discussion: In present research the effects of deficit irrigation treatments on all the measured attributes was significant at harvest time (p≤ 0.01). But Gibberellic acid spray had significant effect only on Fruit weight, juice percent and fruit cracking disorder. Likewise, deficit irrigation and Gibberellic acid interaction showed significant difference for fruit weight and cracking disorder. The results indicated that fruit weight, total yield and fruit juice in regulated deficit irrigation increased by 39.6, 17.1 and 16.6 percent in compare with control, respectively. Fruit numbers in control trees (108.3) was more than sustained (93.6) and regulated (87) deficit irrigation. It is possible that sustained (SDI) and regulated (RDI) deficit irrigation have decreased sprouting growth and consequently second or third waves of pomegranate flowers that forming on these shoots was lower by water restricting. Pomegranate peel percent in studied deficit irrigation strategies were less than control and naturally aril percent was more in these treatments. In other hand, the highest fruit cracking (9.1%) and lowest fruit weight (205.8 g) occurred in sustained deficit irrigation. However Gibberellic acid application could increase fruit weight and alleviate cracking disorder. The results of cold storage experiment showed that maturity index, antioxidant activity, total anthocyanin and chilling index improved by Sustained deficit irrigation. Variations of ripening index during cold storage occurred because of sugar conversion, not the changes of organic acids content. Indeed, rate of starch degradation to simple carbohydrates in fruits increase under drought condition. Probability drought in deficit irrigation treatments as an oxidative stress motivates antioxidant system and consequently increases chilling resistance in pomegranate fruits. Preharvest Gibberellic acid application amended weight loss and increased total anthocyanin and antioxidant activity during cold storage.
Conclusions: On the base of this study it seems that using of some deficit irrigation strategies have acceptable consequences on pomegranate fruit production at conditions of water resources restriction. Likewise Gibberellic acid application on trees that were subjected by deficit irrigations ameliorates the adverse effects of drought stress.

کلیدواژه‌ها [English]

• Fruit Cracking
• Stop watering
• Total anthocyanin
• water requirement
• yield

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