کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10939233 | 1095081 | 2011 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of short- and long-term salinity on leaf water relations, gas exchange, and growth in Ipomoea pes-caprae
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effects of short- and long-term salinity on leaf water relations, gas exchange, and growth in Ipomoea pes-caprae Effects of short- and long-term salinity on leaf water relations, gas exchange, and growth in Ipomoea pes-caprae](/preview/png/10939233.png)
چکیده انگلیسی
Ipomoea pes-caprae is widespread in pantropical coastal areas along the beach. The aim of this study was to investigate the salinity tolerance level and physiological mechanisms that allow I. pes-caprae to endure abrupt increases in salinity under brief or prolonged exposure to salinity variations. Xylem sap osmolality (Xosm), leaf water relations, gas exchange, and number of produced and dead leaves were measured at short- (1-7Â d) and long- (22-46Â d) term after a sudden increase in soil salinity of 0, 85, 170, and 255Â mM NaCl. In the short-term, Xosm was not affected by salinity, but in the long-term there was a significant increase in plants grown in presence of salt compared with control plants. After salt addition, the plants showed osmotic stress with temporal cell turgor loss. However, the water potential gradient for water uptake was re-established at 4, 7 and 22Â d after salt addition, at 85, 170 and 255Â mM NaCl, respectively. In the short-term I. pes-caprae was able to tolerate salinities of up to 255Â mM NaCl without significant reduction in carbon assimilation or growth. With the duration of stress, leaf ion concentration continued to increase and reached toxic levels at high salinity with a progressive decrease in photosynthetic rate, reduced leaf formation and accelerated senescence. Then, if high levels of soil salts from tidal inundation occur for short periods, the survival of I. pes-caprae is possible, but prolonged exposure to salinity may induce metabolic damage and reduce drastically the plant growth.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Flora - Morphology, Distribution, Functional Ecology of Plants - Volume 206, Issue 3, March 2011, Pages 267-275
Journal: Flora - Morphology, Distribution, Functional Ecology of Plants - Volume 206, Issue 3, March 2011, Pages 267-275
نویسندگان
N. Suárez,