کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4569702 1331351 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Pre-conditioning ornamental plants to drought by means of saline water irrigation as related to salinity tolerance
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش باغداری
پیش نمایش صفحه اول مقاله
Pre-conditioning ornamental plants to drought by means of saline water irrigation as related to salinity tolerance
چکیده انگلیسی

This study examines the feasibility of using saline irrigation water for commercial pot cultivation of three ornamentals: Calceolaria hybrida, Calendula officinalis and Petunia hybrida. Two saline treatments were assayed: irrigation with low saline tap water (electrical conductivity = 1.16 dS m−1), and irrigation with a high saline solution of NaCl 100 mM + CaSO4 10 mM + MgSO4 2.5 mM (electrical conductivity = 12.5 dS m−1). When the control plants reached marketable size the watering was stopped and the plant response to drought was studied. Petunia and Calceolaria were tolerant to salinity. Petunia saline-treated plants reduced their growth slightly and increased N and chlorophyll contents in the leaves. Calceolaria experienced a strong reduction in growth and a delay in flowering but no toxicity symptoms or mortality was recorded. These species were moderate NaCl accumulators. Calendula was sensitive to salinity: 16% of the plants died and the surviving ones experienced a heavy reduction of growth, a decrease in chlorophyll and a large accumulation of NaCl in the leaves. Saline pre-conditioned plants of Calceolaria and Petunia were tolerant to drought. In these plants, leaf water content and, specifically, leaf relative water content were sustained longer than in non-pre-conditioned plants throughout the drought period. In Calendula, leaf relative water content decreased at the same rate in pre-conditioned and non-pre-conditioned plants. Consequently, salinization did not confer drought resistance upon this species. Possible factors determining the tolerance to drought in saline pre-conditioned plants are discussed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Scientia Horticulturae - Volume 113, Issue 1, 5 June 2007, Pages 52–59
نویسندگان
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