The Effect of CaCl2 Salinity on Growth Parameters of Lisianthus Cultivars
محورهای موضوعی : مجله گیاهان زینتی
Nabiyollah Ashrafi
1
(Ph.D student, Department of Horticultural Sciences, Faculty of Agriculture, Lorestan University, Khorramabad, Iran.)
Abdolhossein Rezaei Nejad
2
(Associate Professor, Department of Horticultural Sciences, Faculty of Agriculture, Lorestan University, P.O. Box 465, Khorramabad, Iran.)
کلید واژه: Threshold, resistant cultivars, CaCl2-Salinity, <i>Eustoma grandiflorum</i>,
چکیده مقاله :
Soil and water salinity substantially constrain crop and biomass production. To investigate the changes in morphological parameters of lisianthus (Eustoma grandiflorum) cultivars under CaCl2 salinity conditions a greenhouse experiment was conducted. Cultivars namely, ‘Champagne’ (C1), ‘Lime Green’ (C2), ‘Blue Picotee’ (C3) and ‘Pure White’ (C4), were subjected to salt stress (0–30 mM CaCl2) in a washed sand culture and the morphological responses were measured. The results showed that salinity affected all of the considered parameters, so that, as salinity levels increased, plant height, shoot fresh and dry weight and leaf area in all cultivars decreased, while, root length, root fresh and dry weight and root: shoot length ratio increased. However, the changes in Pure White and Lime Green were less than in ‘Champagne’ and ‘Blue Picotee’. Theregression analysis of the relationship between CaCl2 salinity levels and seedlings height or root: shoot length ratio defined two groups with different slope coefficients: C1 and C3 as salt sensitive cultivars and C2 and C4 as salt tolerant cultivars. The results showed that salinity threshold of C1 and C3 was 25 and 30 mM CaCl2 respectively, while C2 and C4 in 30 mM CaCl2 showed no significant differences with control. The results suggests that C2 and C4 could be recommended as resistant cultivars due to attain higher growth, water balance, shoot fresh and dry weight and leaf area in response to CaCl2 salinity compared with C1 and C3.
شوری خاک و آب موجب کاهش رشد و تولید محصولات کشاورزی می­شود. برای بررسی تغییرات مورفولوژیکی ایجاد شده در واریته­های لیسیانتوس تحت شوری کلرید کلسیم آزمایشی در گلخانه­های پژوهشی دانشکده کشاورزی دانشگاه لرستان انجام شد. واریته­های لیسیانتوس شامل شامپاین، فسفری، لب بنفش و سفید تحت شوری کلسیم کلراید (0، 5، 10، 15، 20، 25 و 30 میلی مولار) قرار گرفتند و واکنش مورفولوژیکی ارقام بررسی شد. نتایج نشان داد که شوری همه پارامترهای بررسی شده را تحت تاثیر قرار داده است به طوری که با افزایش سطوح شوری ارتفاع، وزن تر و خشک شاخساره و سطح برگ در همه واریته­ها کاهش پیدا کرده است، در حالی­که طول ریشه، وزن تر و خشک ریشه و همچنین نسبت طول ریشه به شاخساره افزایش نشان داده است. نتایج نشان داد میزان تغییرات در رقم سفید و فسفری کمتر از لب بنفش و شامپاین بوده است. آنالیز رگرسیون رابطه سطوح شوری و ارتفاع گیاهان (درصد نسبت به شاهد) دو گروه مجزا با شیب خط متفاوت نشان داد، به اینصورت که رقم‌های شامپاین و لب بنفش به عنوان ارقام حساس و رقم‌های سفید و فسفری به عنوان ارقام مقاوم در دو گروه مجزا قرار گرفته اند. نتایج نشان داد آستانه مقاومت به شوری در رقم لب بنفش و شامپاین به ترتیب 30 و 25 میلی مولار بوده است در حالی­که ارقام سفید و فسفری در سطوح شوری 30 میلی مولار اختلاف معنی داری با شاهد نداشته اند. با توجه به نتایج به دست آمده و کاهش کمتر ارتفاع، تعادل آبی، وزن تر و خشک شاخساره و همچنین سطح برگ در واریته­های سفید و فسفری، به نظر می­رسد این واریته­ها نسبت به واریته­های شامپاین و لب بنفش مقاومت بیشتری نسبت به شوری کلسیم کلرید داشته باشند.
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