The Effect of CaCl2 Salinity on Growth Parameters of Lisianthus Cultivars

Journal of Ornamental Plants

مقاله 3، دوره 8، شماره 2، شهریور 2018، صفحه 101-110   

نوع مقاله: Research Paper

نویسندگان

Nabiyollah Ashrafi^{* 1}؛ Abdolhossein Rezaei Nejad²

¹Ph.D student, Department of Horticultural Sciences, Faculty of Agriculture, Lorestan University, Khorramabad, Iran.

²Associate Professor, Department of Horticultural Sciences, Faculty of Agriculture, Lorestan University, P.O. Box 465, Khorramabad, Iran.

چکیده

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.

کلیدواژه‌ها

CaCl2-Salinity؛ Eustoma grandiflorum؛ resistant cultivars؛ Threshold

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