| Influences of exogenous salicylic acid on growth and resistance physiology of continuous cropping potato |
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| DOI：10.7606/j.issn.1000-7601.2014.04.001 |
| Key Words: potato salicylic acid continuous cropping growth an
d development resistance |
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| Abstract: |
| The experiment was conducted to investigate the influences of exogenous salicylic acid (SA) on seedling growth, resistance to continuous cropping obstacles, oxidation resistance and tuber nutrition of both continuous and discontinuous cropping potato. The results indicated that 5 years of
continuous cropping induced significant decrease in chlorophyll content, net photosynthetic rate, cell membrane stability index, osmoregulation substance content, antioxidant content, antioxidant enzyme activities, tuber yield, tuber hardness, and the contents of starch, Vc and soluble protein in tubers, significant increase in the contents of MDA and reactive oxygen species in leaves, and significant inhibition in plant growth of potato. However, after being treated by exogenous SA, the relative water content of potato seedlings were increased, the chlorophyll content, net photosynthetic rate, root activity and cell membrane stability index were enhanced, the growth of plants was promoted, the osmoregulation substance content, antioxidant content and antioxidative enzyme activities in leaves were improved, the tuber yield, tuber hardness and the contents of starch, Vc and soluble protein were raised, while the contents of MDA and reactive oxygen species were decreased significantly. As for the treatments of exogenous SA, the concentrations of 20 μmol·L-1 and 30 μmol·L-1 were better than other concentrations in promoting the growth of potato seedlings and resistance to continuous cropping obstacles. For potato with 5 years continuous cropping, the treatment of 30 μmol·L-1 exogenous SA increased the tuber yiel
d by 64.4% and net photosynthetic rate in leaves by 287.0% compared with the control. It is concluded that proper concentration of exogenous SA can relief the damage caused by continuous cropping obstacles, promote the growth and development of potato plants, raise the tuber yield, and improve the nutrition and quality of tubers. |
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