| Influences of fulvic acid on drought resistance of aeroponic potato seedlings |
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| DOI：10.7606/j.issn.1000-7601.2013.03.25 |
| Key Words: aeroponic potato seedling fulvic acid PEG-6000 drought stress growth and physiological parameter resistance |
| Author Name | Affiliation | | QIU Mengke | College of Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | HUI Zhenlong | College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Cansu Provincial Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | HUANG Xiaopeng | College of Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | WU Jinfeng | College of Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| Using potato(Solanum tuberosum)seedlings as researeh objeets, effects of different treatments of fulvic acid and drought stress(CK,10% PEG,0.01% FA+10% PEG,0.03%FA+10%PEG,0.05%FA+10% PEG,and 0.10%FA+10% PEG) on growth and drought-resistant physiological parameters
of aeroponic potato were studied. The results showed that
seedling survival rate,chlorophyll content, membrane stability index, root vigor, number of procumbent stems, tuber rate and output of aeroponie potato tended to decrease, malondialdehyde(MDA) content, hydrogen peroxide(H2O2)content, proline content, soluble sugar content, catalase(CAT) activity and production rate of superoxide anion(O-2)tended to increase, and activity of superoxide dismutase(SOD) and peroxidase(POD)increased firstly and then decreased under drought stress. Thus the growth and development of aeroponic potato seedlings were inhibited significantly under drought stress. Under the treatments of fulvic acid and drought stress, seedling survival rate, number of procumbent stems, tuber rate and output inereased, while chlorophyll content,membrane stability index and root vigor still
tended to decrease but their decrease rate was smaller than that under treatment of single drougbt stress; MDA content, SOD activity and POD activity inereased firstly and then decreased; Proline content, soluble sugar content, H2O2 content and catalase(CAT) activity increased, in whieh the increase rate of H2O2 content was lower than that under the treatment of single drought stress. Therefore, application of fulvie acid could promote
growth and develop ment of aeroponic potato seedlings under drought stress, and improve overall drought resistance of plants. The resistance was significantly associated with concentration of fulvic acid. The protective effect of 0.05% FA was the most significant, but 0.10% FA even brought cooperatively injury to potato seedlings wiith PEG stress. |
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