| Effects of water stress on growth and photosynthetic characteristics of color pepper seedlings |
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| DOI：10.7606/j.issn.1000-7601.2016.02.30 |
| Key Words: color pepper seedling water stress growth index photosynthetic parameters chlorophyll fluorescence parameters subordinate function analysis |
| Author Name | Affiliation | | XU Yao-zhao | College of Agriculture and Biotechnology, Hexi University, Zhangye Gansu 734000, China | | ZHANG Fen-qin | College of Agriculture and Biotechnology, Hexi University, Zhangye Gansu 734000, China | | CHEN Xiu-bin | College of Agriculture and Biotechnology, Hexi University, Zhangye Gansu 734000, China | | Li Yi-hua | College of Agriculture and Biotechnology, Hexi University, Zhangye Gansu 734000, China | | ZHANG Wen-bin | Station for Popularizing Commercial Crop of Zhangye, Zhangye, Gansu 734000, China | | ZHANG Jie | College of Agriculture and Biotechnology, Hexi University, Zhangye Gansu 734000, China |
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| Abstract: |
| The seedlings of yellow color pepper Huaxianzi were used to study the effects of water stress on their growth and photosynthetic characteristics. The results showed that with the extended duration of water stress, plant height, stem diameter, leaf number and leaf area were increased. With the increase of water-stress levels, some growth indexes, such as plant height, stem diameter, leaf number, leaf area, root length, etc., became significantly decreased, whereas root-shoot ratio went increased. In addition, with the increase of time under water stress, some photosynthetic indexes and fluorescence parameters including net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO2 concentration (Ci), transpiration rate (Tr), minimal fluorescence (Fo), maximum number of PSⅡ quantum yield (Fv/Fm) and leaf potential activity of PSⅡ (Fv/Fo), showed a downward trend, but PSⅡ leaf photosynthetic performance index (PI) and chlorophyll content were increased. With the increase of water-stress degrees, all photosynthetic indexes and fluorescence parameters became decreased significantly except for Fo. Moreover, based on the subordinate function analysis, some growth indexes such as leaf area, root length, plant height, root-shoot ratio, and root volume, and some photosynthetic indexes and fluorescence parameters including Ci, Pn, Fv/Fm, PI and Fo, were closely related with water-stress degrees in yellow color pepper seedlings. In conclusion, 75% and 65% of soil water capacities had no effect on growth and photosynthetic characteristics of yellow color pepper seedlings, which could meet water demand for the normal growth of yellow pepper. |
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