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KMID : 1098420200280010001
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Korean Journal of Medicinal Crop Science
2020 Volume.28 No. 1 p.1 ~ p.8
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Effects of NaCl on the Growth and Physiological Characteristics of Crepidiastrum sonchifolium (Maxim.) Pak & Kawano
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Lee Kyeong-Cheol
Han Sang-Kyun
Yoon Kyeong-Kyu
Lee Hak-Bong
Song Jae-Mo
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Abstract
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Background: This study was conducted to investigate the effects of NaCl concentration on the photosynthetic parameters, chlorophyll fluorescence and growth characteristics of Crepidiastrum sonchifolium.
Methods and Results: As treatments, we subjected C. sonchifolium plants to four different concentrations of NaCl (0, 50, 100 and 200 mM). We found that the photosynthetic parameters maximum photosynthesis rate (PN max), net apparent quantum yield (Φ), maximum carboxylation rate (Vcmax), and maximum electron transport rate (Jmax) were significantly reduced at an NaCl concentration greater than 100 mM. In contrast, there was an increase in water-use efficiency with increasing NaCl concentration, although in terms of growth performances, leaf dry weight, root dry weight, stem length, and total dry weight all decreased with increasing NaCl concentration. Furthermore, leakage of electrolytes, as a consequence of cell membrane damage, clearly increased in response to an increase in NaCl concentration. Analysis of the polyphasic elevation of chlorophyll a fluorescence transients (OKJIP) revealed marked decrease in flux ratios (ΦPO, ΨO and ΦEO) and the PIabs, performance index in response to treatment with 200 mM NaCl, thereby reflectings the relatively reduced state of photosystem II. This increase in fluorescence could be due to a reduction in electron transport beyond Q? A . We thus found that the photosynthetic parameters, chlorophyll fluorescence and growth characteristics of C. sonchifolium significantly increased in response to treatment with 200 mM NaCl.
Conclusions: Collectively, the findings of this study indicate that C. sonchifolium shows relatively low sensitivity to NaCl stress, although photosynthetic activity was markedly reduced in plants exposed to 200 mM NaCl.
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KEYWORD
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Crepidiastrum sonchifolium, NaCl Stress, Performance Index, Photosynthetic Activities, Polyphasic Rise of Chlorophyll a Fluorescence Transients
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