| Growth and physiological responses of two genotypes jerusalem artichoke (Helianthus tuberosus L.) seedlings under salt stress |
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| DOI：10.7606/j.issn.1000-7601.2018.03.27 |
| Key Words: jerusalem artichoke genotype salt stress growth and development physiological responses |
| Author Name | Affiliation | | DUAN Hai-xia | School of Life Sciences, Lanzhou University, State Key Laboratory of Grassland Agro-Ecosystems, Lanzhou， Gansu 730000, China | | ZOU Gong-lu | School of Life Sciences, Lanzhou University, State Key Laboratory of Grassland Agro-Ecosystems, Lanzhou， Gansu 730000, China | | YANG Yong-xin | School of Life Sciences, Lanzhou University, State Key Laboratory of Grassland Agro-Ecosystems, Lanzhou， Gansu 730000, China | | LI Ying | School of Life Sciences, Lanzhou University, State Key Laboratory of Grassland Agro-Ecosystems, Lanzhou， Gansu 730000, China | | L Shi-qi | School of Life Sciences, Lanzhou University, State Key Laboratory of Grassland Agro-Ecosystems, Lanzhou， Gansu 730000, China | | SUN shan | School of Life Sciences, Lanzhou University, State Key Laboratory of Grassland Agro-Ecosystems, Lanzhou， Gansu 730000, China | | ZHAO Chang-ming | School of Life Sciences, Lanzhou University, State Key Laboratory of Grassland Agro-Ecosystems, Lanzhou， Gansu 730000, China |
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| Abstract: |
| In order to identify the differences between two genotypes jerusalem artichoke seedlings under salt stress, effects of different concentrations of neutral salt (2‰, 4‰, 6‰) on physiological characteristics of growth and photosynthetic of two genotypes jerusalem artichoke seedlings (LZJ028 was characterized by strong sexual reproduction and high nutritional quality, LZJ017 was more productive) were investigated by pot cultivating experiment. The results showed that: (1) When the soil salt concentration was more than 2‰, plant height, leaf area, canopy, stem weight and leaf weight of both jerusalem artichoke seedlings decreased, plant height, leaf area and above-ground biomass of LZJ028 (the degree of decreased were 4.24%, 6.26%, 14.82%, 29.67%, 8.51%, 19.68%, 7.62% and 22.38%) decreased lesser than LZJ017 (the degree of decreased were 9.78%, 29.75%, 58.33%, 63.18%, 15.77%, 26.88%, 40.62% and 61.82%). (2) With the increasement of soil salt concentration, SOD activity, the content of free proline and soluble sugar of jerusalem artichoke seedlings leaves were significantly elevated (for example, SOD activity of LZJ017 and LZJ028 was 0.41 and 1.87 times higher than that of the control group when the salt concentration was 6‰), proline increased by 8.26 times and 42.92 times, the soluble sugar content increased by 0.39 times and 1.18 times, LZJ028’s increasing ranges of them were more than LZJ017. (3) With the increasement of soil salt concentration, leaf net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) and chlorophyll content of both jerusalem artichoke seedlings were reduced, while LZJ028 had a much smaller drop in Pn and Gs than LZJ017. Furthermore, potential activity (Fv/Fo), maximum photochemical efficiency (Fv/Fm) of PSⅡ decreased, but initial fluorescence (Fo) increased, the varied range of Fo and Fv/Fm on LZJ028 (10.53% and 4.81%) were smaller than LZJ017 (43.04% and 52.73%) when the salt concentration was 6‰. These results showed that salt stress main inhibited the plant’s growth through destroying the PSⅡactivity and carbohydrate metabolic rate of jerusalem artichoke, on the other hand, jerusalem artichoke would carry out improving activity of superoxide dismutase (SOD), increasing osmotic regulation substances and other strategies to alleviate stress. And more importantly, LZJ028 was more salt tolerance than LZJ017. |
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