تاثیر شوری آب آبیاری بر شاخص‌های رشد و فیزیولوژی سه رقم خیار

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی آب، واحد کرمان، دانشگاه آزاد اسلامی، کرمان، ایران.

2 گروه مهندسی آب، واحد کرمان، دانشگاه آزاد اسلامی، کرمان، ایران

چکیده

مطالعه پاسخ ارقام مختلف گیاهی در برابر تنش شوری و معرفی ارقام مقاوم یکی از راهکارهای مهم در حفظ و افزایش عملکرد محصولات کشاورزی محسوب می‌شود. پژوهش حاضر با هدف بررسی اثر آبیاری با سطوح مختلف شوری بر ویژگی‌های رویشی و فیزیولوژیکی ارقام مختلف خیار انجام شد. به این منظور، آزمایشی گلخانه‌ای به صورت فاکتوریل در قالب طرح کاملا تصادفی با دو فاکتور شامل سه رقم خیار (کیهان، ناهید 484 و 485) و شوری (با سطوح 5/0، 1/3 و 2/6 دسی‌زیمنس بر متر)، هر یک در سه تکرار انجام شد. نتایج نشان داد که تنش شوری اثر معنی‌داری بر رشد گیاه و محتوای رنگدانه­های فتوسنتزی دارد به‌طوری‌که در بیشترین سطح شوری، میزان کلروفیل a در ارقام کیهان، ناهید 484 و 485 به‌ترتیب 47، 21 و 19 درصد نسبت به شاهد کاهش یافت. همچنین میزان کاهش کلروفیل کل در رقم کیهان برابر با 34 درصد و در دو رقم دیگر 22 درصد بود. از طرفی، بیشترین میزان کارتنوئید در شرایط تنش شوری، در رقم ناهید 484 و 485 مشاهده شد. نتایج همچنین نشان داد که با افزایش سطح شوری به 2/6 دسی‌زیمنس بر متر، ارتفاع گیاه در رقم‌های کیهان، ناهید 485 و ناهید 484 به‌ترتیب 30، 23 و 11 درصد کاهش می­یابد. علاوه بر این، بیشترین درصد ریزش برگ در بالاترین سطح شوری نسبت به شاهد، مربوط به رقم کیهان به میزان 28 درصد و بیشترین کاهش وزن خشک ریشه مربوط به رقم 485 به میزان 40 درصد بود. در مجموع، نتایج این پژوهش نشان داد که ارقام مختلف خیار، پاسخ متفاوتی به تنش شوری نشان دادند. در این بین، رقم ناهید 484 بیشترین مقاومت را در پاسخ به تنش شوری به خود اختصاص داد و لذا به عنوان یک رقم مقاوم خیار در برابر شرایط تنش شوری معرفی می‌شود.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Irrigation Water Salinity on Growth and Physiology Characteristics of Three Cucumber Cultivars

نویسندگان [English]

  • Ali Alimohamadi 1
  • Najme Yazdanpanah 2
1 Dept. of Water Engineering, Kerman Branch, Islamic Azad University, Kerman, Iran
2 Dept. of Water Engineering, Kerman Branch, Islamic Azad University, Kerman, Iran
چکیده [English]

Studying the response of different plant cultivars to salinity stress and introducing the resistant cultivars is one of the most important strategies to increase cucumber yield under salinity stress. This study was done to investigate the effect of irrigation with different levels of salinity on growth and physiological characteristics of several cucumber cultivars. For this purpose, a factorial experiment with two factors including cultivar (Keyhan, 485 and Nahid 484) and salinity (0.5, 3.1 and 6.2 dS m-1), each at three replications was conducted. The results showed that salinity stress affected the plant growth and photosynthetic pigment content. At the highest salinity level as compared to the control, the chlorophyll a in Keyhan, Nahid 484 and 485 cultivars decreased by 47, 21 and 19%, respectively, while the total chlorophyll was reduced in Keyhan cultivar by 34% and in the other two cultivars by 22%. Under salinity stress, the highest amount of carotenoids was observed in Nahid 484 and 485. The results also indicated that with increasing salinity level to 6.2 dSm-1, the plant height in Keyhan, Nahid 485 and Nahid 484 cultivars decreased by 30, 23 and 11%, respectively. In addition, the percentage of leaf fall at the highest salinity level was observed in Keyhan cultivar with a 28% reduction as compared to the control. Cultivar 485 showed the highest reduction of root dry weight by 40%. In general, different cultivars showed different responses to salinity stress. Among the cultivars, Nahid 484 showed the hegighest resistance in response to salinity stress, therefore it can be introduced as a tolerance cultivar in terms of salinity stress.

کلیدواژه‌ها [English]

  • salinity
  • Carotenoids
  • Chlorophyll
  • Leaf area
  • plant yield
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