تأثیر محلول‌پاشی پتاسیم بر بوته‌های خیار رقم Miran تحت تنش خشکی

نوع مقاله : مقالات پژوهشی

نویسندگان

1 دانشگاه صنعتی اصفهان

2 دانشیار گروه علوم باغبانی،دانشگاه صنعتی اصفهان

10.22067/jhs.2021.67249.0

چکیده

تنش خشکی ناشی از افزایش پتانسیل اسمزی خاک به ویژه در گلخانه‌ها که مصرف کود زیاد است یکی از مشکلات کشت‌های گلخانه‌ای محسوب می‌شود. تنش خشکی ناشی از افزایش پتانسیل اسمزی خاک به ویژه در گلخانه‌ها که مصرف کود زیاد است یکی از مشکلات کشت‌های گلخانه‌ای محسوب می‌شود. در پژوهش حاضر از سه غلظت پلی اتیلن‌گلایکول در سه سطح صفر (D1)، 48/1- (D2)، 91/4- (D3) دسی‌زیمنس بر متر و کلریدپتاسیم در دو سطح صفر (K1) و 6 (K2) میلی‌مولار) جهت کاهش احتمالی اثر خشکی استفاده شد. صفات مورد مطالعه شامل وزن خشک، وزن‌تر، کلروفیل، کلروفیل فلورسانس، فلاونوئید، کاروتنوئید، پرولین، فنول، پروتئین کل، آبسیزیک اسید، سوپراکسید و آسکوربات پراکسیداز، آنتی‌اکسیدان و کاتالاز بودند. نتایج بدست آمده، نشان داد که اثر محلولپاشی پتاسیم در تمام صفات به غیر از میزان کلروفیل فلورسانس و سوپراکسید‌دیسموتاز معنی‌دار P≤0.01)) بود. با توجه به نتایج به‌دست‌آمده کاربرد کلریدپتاسیم صفر میلی‌مولارموجب افزایش میزان آنتی‌اکسیدان و کاتالاز گردید اما کاربرد کلریدپتاسیم 6 میلی‌مولار روی اکثر پارامترهای اندازه‌گیری شده ازجمله میزان وزن خشک، وزن‌تر، کلروفیل، فلاونوئید، کاروتنوئید، پرولین، فنول، پروتئین کل، اسید‌آبسیزیک ، سوپراکسید‌دیسموتاز و آسکوربات پراکسیداز تأثیر مثبت نشان داد. در غلظت 91/4- دسی‌زیمنس بر متر با افزودن کلریدپتاسیم 6 میلی‌مولار بیشترین میزان فنول و پروتئین مشاهده شد همچنین محتوای اسید آبسیزیک در تمام تیمارها با افزودن کلریدپتاسیم 6 میلی‌مولار افزایش یافت و بیشترین میزان در غلظت 91/4- دسی‌زیمنس بر متر مشاهده شد که می‌توان نتیجه گرفت کاربرد پتاسیم در غلظت ۶ میلی مولار می‌تواند آثار سوء تنش خشکی را به میزان در شرایط مشابه بر روی خیارکاهش دهد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Effect of Potassium Foliar Application on Cucumber Plants of Miran Cultivar Under Drought Stress

نویسندگان [English]

  • Mahya Sajedimehr 1
  • m h 2
  • و و 1
2 ب
چکیده [English]

Introduction:
Drought stress is one of the most important factors limiting plant growth and production and leads to a reduction of more than 50% in the average production of most crops worldwide. Drought stress due to increased soil osmotic potential, especially in greenhouses where fertilizer consumption is high, is one of the greenhouse crop problems.
Material and methods:
In the present study, two concentrations of polyethylene glycol at three levels of 0 (D1), -1.48 (D2), 4-91 (D3 ds/m to create different levels of drought stress due to osmotic changes in culture medium and application of KCl at two levels (0 (K1) and 6 (K2) mmol / l) was used to reduce the possible effects. The experiment was performed as a factorial experiment in a completely randomized design with three replications. The treatments were applied in such a way that when the surface of the pots was dry, irrigation with different concentrations of PEG and once a week spraying with Kcl at the desired concentrations was done. Cucumber seeds were planted directly in 5 kg plastic pots containing a mixture of potting soil, including soil + sand + animal manure in the ratio of 1 + 2 + 0.5. The number of seedlings in each pot was 2 to 3 kg, which was reduced to one seedling seventeen days after sowing the seeds in the stage of three to four leaves. KCl spraying and spraying began in the three to four-leaf stage of the seedlings and lasted for about a month. The plants were kept in the greenhouse during the experiment with an average temperature of 25 ° C and relative humidity of 70%. At the end of the experiment, dry weight, fresh weight, chlorophyll, chlorophyll fluorescence, flavonoids, carotenoids, proline, phenol, total protein, abscisic acid, superoxide and ascorbate peroxidase, antioxidants and catalase were measured.
Result:
Introduction:
Drought stress is one of the most important factors limiting plant growth and production and leads to a reduction of more than 50% in the average production of most crops worldwide. Drought stress due to increased soil osmotic potential, especially in greenhouses where fertilizer consumption is high, is one of the greenhouse crop problems.
Material and methods:
In the present study, two concentrations of polyethylene glycol at three levels of 0 (D1), -1.48 (D2), 4-91 (D3 ds/m to create different levels of drought stress due to osmotic changes in culture medium and application of KCl at three levels (0 (K1) and 6 (K2) mmol / l) was used to reduce the possible effects. The experiment was performed as a factorial experiment in a completely randomized design with three replications. The treatments were applied in such a way that when the surface of the pots was dry, irrigation with different concentrations of PEG and once a week spraying with Kcl at the desired concentrations was done. Cucumber seeds were planted directly in 5 kg plastic pots containing a mixture of potting soil, including soil + sand + animal manure in the ratio of 1 + 2 + 0.5. The number of seedlings in each pot was 2 to 3 kg, which was reduced to one seedling seventeen days after sowing the seeds in the stage of three to four leaves. KCl spraying and spraying began in the three to four-leaf stage of the seedlings and lasted for about a month. The plants were kept in the greenhouse during the experiment with an average temperature of 25 ° C and relative humidity of 70%. At the end of the experiment, dry weight, fresh weight, chlorophyll, chlorophyll fluorescence, flavonoids, carotenoids, proline, phenol, total protein, abscisic acid, superoxide and ascorbate peroxidase, antioxidants and catalase were measured.
Result:
The results showed that the effect of foliar application of potassium in all traits except chlorophyll fluorescence and superoxide dismutase was significant (P <0.01). According to the obtained results, the application of K1 increased the amount of antioxidants and catalase, but the application of K2 on most of the measured parameters, including dry weight, fresh weight, chlorophyll, flavonoids, carotenoids, proline, phenol, total protein, abscisic acid and superoxide disodium Showed a positive effect. In D3 with the addition of K2 the highest amount of phenol and protein was observed. Also the content of abscisic acid in all treatments increased with the addition of K2 and the highest amount was observed in D3 which can be concluded that the use of potassium at a concentration of 6 mM Acceptable cut. According to the results obtained in this study, it can be stated that the plant tries to maintain its osmotic pressure in the face of drought stress, and this is done by increasing osmolites such as proline and antioxidant enzymes that help maintain plant cell pressure and torsion. . Potassium application can reduce the adverse effects of drought stress by improving the activity of antioxidant enzymes and preserving chlorophyll. Thus, the cell continues its vital activities and ultimately produces more acceptable performance under these conditions. In other words, increasing the antioxidant activity in drought conditions along with the application of potassium leads to a higher inhibitory capacity of reactive reactive oxygen species and production stability in these conditions. Therefore, to compensate for at least some harmful effects of stress and help the plant to return to normal growth conditions after re-irrigation, foliar application of such elements can be effective in drought resistance of the plant and play a role. Based on the findings of this study, it seems that the application of potassium with a concentration of 6 mM is the most effective.

کلیدواژه‌ها [English]

  • Antioxidant enzymes
  • Polyethylene glycol
  • Stress
  • osmotic pressure
  • Foliar application

مقالات آماده انتشار، پذیرفته شده
انتشار آنلاین از تاریخ 19 خرداد 1400
  • تاریخ دریافت: 08 آذر 1399
  • تاریخ بازنگری: 15 خرداد 1400
  • تاریخ پذیرش: 19 خرداد 1400