تأثیر محلول‌پاشی آسکوربیک اسید و کلسیم بر خصوصیات مورفو-فیزیولوژیکی گوار (Cyamopsis tetragonoloba) در شرایط تنش خشکی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زیست شناسی، دانشکده علوم، دانشگاه سیستان و بلوچستان، زاهدان، ایران

2 گروه تولیدات گیاهی، دانشکده کشاورزی، مجتمع آموزش عالی سراوان، سراوان، ایران

چکیده

به منظور بررسی پاسخ‎های مورفو-فیزیولوژیکی گیاه گوار به محلول‎پاشی آسکوربیک اسید و کلسیم تحت شرایط تنش خشکی، آزمایشی بصورت فاکتوریل با دو فاکتور در قالب طرح بلوک کامل تصادفی با سه تکرار در گلخانه تحقیقاتی مجتمع آموزش عالی سراوان در سال 1400-1399 انجام گردید. تیمارهای آزمایشی شامل سه سطح تنش خشکی (70، 50 و 30 درصد ظرفیت زراعی) و سه سطح محلول‎پاشی (عدم محلول‎پاشی، محلول‎پاشی با کربنات کلسیم و آسکوربیک اسید با غلظت سه در هزار) بودند. نتایج نشان داد که با اعمال سطوح تنش خشکیِ 50 و 30 درصد ظرفیت زراعی، نسبت به تیمار 70 درصد ظرفیت زراعی، صفات ارتفاع بوته، تعداد غلاف در بوته، تعداد دانه در غلاف، طول غلاف، وزن خشک برگ و پروتئین کل روندی کاهشی و صفات قند احیایی، فعالیت آنزیم پلی‎فنل اکسیداز و طول ریشه روندی افزایشی نشان دادند. محلول‎پاشی کلسیم، نسبت به شرایط عدم محلول‎پاشی و محلول‎پاشی با اسید آسکوربیک، صفات ارتفاع بوته، تعداد غلاف در بوته و وزن خشک برگ را بطور معنی‎داری افزایش داد. هم‎چنین محلول‎پاشی با اسید آسکوربیک و کلسیم، نسبت به شرایط عدم محلول‎پاشی، میزان پروتئین کل، قند احیایی و طول و وزن خشک ریشه را بطور معنی‎داری افزایش و فعالیت آنزیم پلی‎فنل اکسیداز را بطور معنی‎داری کاهش داد. در مجموع به نظر می‎رسد که فراهمی رطوبت در حد مقادیر 50 و 30 درصد ظرفیت زراعی، باعث شکل‎گیری مکانیسم‎های مقابله با تنش خشکی در گیاه گوار شده، اما محلول‎پاشی با اسید آسکوربیک و کلسیم، می‎تواند تا حدی در تعدیل اثرات تنش خشکی بر روی این گیاه مؤثر باشد.

کلیدواژه‌ها


عنوان مقاله [English]

The effect of foliar application of ascorbic acid and calcium on the morpho-physiological characteristics of guar under drought stress conditions

نویسندگان [English]

  • Nezamuddin Hossieni Nejad 1
  • Masoud Ziaei 2
  • Alireza Einali 1
1 Department of Biology, Faculty of Science, University of Sistan and Baluchestan, Zahedan, Iran
2 Department of Plant Production, Faculty of Agriculture, Higher Education Complex of Saravan, Saravan, Iran
چکیده [English]

Introduction: Guar (Cyamopsis tetragonoloba) is an annual plant from the legume family and tolerant to salinity and drought, which can be used as an alternative product in low water plains. Ascorbic acid is one of the antioxidants involved in the defense mechanisms of plants against various stresses, including drought, which plays a role in ROS detoxification. Calcium is also an essential element for plant growth, which, despite being immobile, has many electrochemical, structural and catalytic functions in plants. It has been reported that calcium ions can increase drought tolerance in plants by participating in the drought signal transduction process and stimulating abscisic acid synthesis. Therefore, this research was conducted with the aim of investigating the effect of foliar spraying of ascorbic acid and calcium on some morpho-physiological traits of guar under drought stress conditions.
Materials and Methods: In order to investigate the morpho-physiological responses of guar to foliar application of ascorbic acid and calcium under drought stress conditions, a factorial experiment was conducted with two factors in the form of a randomized complete block design with three replications in the research greenhouse of Saravan Higher Education Complex in 2020. The experimental treatments included three levels of drought stress (70, 50 and 30% of field capacity) and three levels of foliar application (no foliar application, foliar application with calcium carbonate and ascorbic acid with a concentration of 3‰).
Results and Discussion: The results showed that in 50 and 30% of the field capacity, compared to the treatment of 70% of the field capacity, plant height, number of pods per plant, number of seeds per pod, pod length, leaf dry weight and total protein showed a decreasing trend, but traits of reducing sugar, Polyphenol oxidase (PPO) enzyme activity and root length showed an increasing trend. The increase of reducing sugars is considered a mechanism to deal with drought in plants because reducing sugars are osmolytes that play a role in plant cells as regulators of the osmotic potential of the intracellular environment. Similarly, the increase in PPO activity during drought stress is justified by the increase in radical oxygen species generated during this stress, because the increase in the activity of antioxidant compounds as a defense mechanism is essential to maintain cellular processes and prevent the damaging effects of free radicals on plant physiological processes. Foliar application with ascorbic acid did not significantly change plant height and number of pods per plant compared to non-sprayed plants but increased leaf dry weight, total protein, reducing sugar and root length by 22%, 11%, and 21%, respectively. While, calcium foliar application significantly increased plant height, number of pods per plant and leaf dry weight by 16%, 24%, and 42%, respectively compared to non-foliar application and 8.5%, 12%, and 17.5% compared to foliar application with ascorbic acid, but total protein, reducing sugar, root length and dry weight of root remained statistically unchanged in calcium spraying respect to foliar application with ascorbic acid. However, both ascorbic acid and calcium application than no-foliar application showed a significant increase in the amount of total protein, reducing sugar, root length and dry weight of root and a decrease in PPO enzyme activity. The decrease in PPO activity can be considered as a result of reducing the harmful effects of drought stress caused by the application of calcium and ascorbic acid.
Conclusion: In general, it seems that the availability of moisture in less than 70% of the field capacity has caused the formation of mechanisms to deal with drought stress in the guar, but foliar application with ascorbic acid and calcium can somewhat to be effective in modulating the effects of drought stress on this plant.

کلیدواژه‌ها [English]

  • Dry weight of root
  • Field capacity
  • Polyphenol oxidase
  • Reducing sugar
  • Total protein
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دوره 5، شماره 3 - شماره پیاپی 11
این شماره با همکاری انجمن علمی دانش کشاورزی گرمسیری ایران منتشر شده است
اسفند 1402
صفحه 655-670
  • تاریخ دریافت: 10 آبان 1401
  • تاریخ بازنگری: 12 بهمن 1401
  • تاریخ پذیرش: 13 بهمن 1401