| Morphological and physiological responses of broomcorn millet seedlings to drought stress |
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| DOI：10.7606/j.issn.1000-7601.2013.02.32 |
| Key Words: broomcorn millet drought stress morphological character physiological character synthetic evaluation |
| Author Name | Affiliation | | FENG Xiaomin | College of Life Science, Shanxi Normal University, Linfen, Shanxi 041000, China | | ZHANG Yongqing | College of Life Science, Shanxi Normal University, Linfen, Shanxi 041000, China
College of Urban and Environmental Science, Shanxi Normal University, Linfen, Shanxi 041000, China | | LI Peng | College of Life Science, Shanxi Normal University, Linfen, Shanxi 041000, China | | YAN Jiangyan | College of Life Science, Shanxi Normal University, Linfen, Shanxi 041000, China | | WANG Hairu | College of Life Science, Shanxi Normal University, Linfen, Shanxi 041000, China | | JING Xiaoyuan | College of Urban and Environmental Science, Shanxi Normal University, Linfen, Shanxi 041000, China |
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| Abstract: |
| With pot cultivation method, the morphological and physiological characters of different broomcorn millet cultivars at seedling stage were studied under controlled water conditions. The results showed that: (1)
Under mild water stress, the morphological parameters of Longmi 4, 5283 Huang and Jinshu 7 such as plant height, leaf area, total root length and total root volume were changed little compared with the control treatment, but they were influenced significantly under severe stress. The values of these parameters of the three tested cultivars tended to decrease with the intensification of water stress, in which, the decrease rate of Jinshu 7 was lower than that of Longmi 4 and 5283 Huang. (2) As for the active oxygen scavenging system and osmolytes, the activity of SOD and POD, and the content of proline and soluable sugar in the tested cultivars wholly tended to increase with the intensification of water stress. The increase rate of the cultivars was ranked as: Longmi 4>5283 Huang>Jinshu 7. The activity of SOD and the content of proline and soluable sugar in the three cultivars under water stress conditions differed significantly with those under the control. The activity of POD in 5283 Huang and Jinshu 7 under moderate and severe water stress differed significantly with that under the control. (3) The chlorophyll content, relative leaf water content and net photosynthetic rate of the three cultivars wholly tended to decrease with the intensification of water stress, in which Jinshu 7 was affected with the largest degree. The values of these parameters under severe stress differed significantly with those under the control. (4) The root activity of Jinshu 7 was influenced remarkably by water stress, and its membrance permeabilitity and MDA content increased largely, so it was injured seriously and its drought-resistant ability was poor, while the droght-resistant ability of Longmi 4 was relatively strong. |
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