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Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Using potato variety ‘Xuanshu 2' as materials，we studied the changes of relative conductivity，content of chlorophyll，POD activity ，SOD activity，contents of MDA ，free pro line，water soluble sugar and water soluble protein under different low temperature stress by artificial，at the seedling stage of potatoes. Based on these physiological and biochemical indexes correlation analysis，Some key indexes were screened out which could evaluate the cold tolerance of potato seedlings，the results indicated that with the lowering of stress temperature and the prolonging of stress time，the relative conductivity of potato seedlings was increased，content of chlorophyll was decreased，POD activity and SOD activity were firstly increased and then decreased，increased slowly at last，content of MDA，free proline and water soluble sugar were firstly increased and then decreased， content of water soluble protein was constantly increased. The relative conductivity， content of chlorophyll，POD activity，SOD activity，water soluble sugar and water soluble protein，were significant or extremely significant respectively， but a single index could not evaluate the cold tolerance of potato seedlings. It must be combined with other indexes to a comprehensive evaluation. Evaluation on cold tolerance of 14 potato varieties were made through fuzzy comprehensive evaluation method，the cold tolerance order was Zhuanxinwu > Hui-2 > Jizhangshu12 > Lishu6 > Zhongshu18 > Jinshu16 > Mira > Favorita > Diantongshu1 > Dianshu716 > Mangguoyangyu > Xuanshu2 > Hezuo88 > Weiyu3. [ABSTRACT FROM AUTHOR]

In this study, the treatments with 2-pin shading net covering the potato, without shading net as the control were designed. The effect of different shading treatments on growing, yield and nutritional quality of ‘Qingshu9' was researched. It turned out that height, internode length, leaf area increased obviously compared with the control treatment after shaded, stem diameter decreased compared with the control treatment, main stem number, and pitch number had no significant difference compared with the control treatment. And the shading treatment had a serious effect on tuber yield. Under the 70. 22 % shading, the commodity rate, weight of individual plant, yield decreased remarkably compared with the control which could reduce 87. 08 % production,other shade treatments that the shading over the 80 % was never produced. Therefore the shading 70 % was used as the selection pressure for another 9 potato varieties of shade-tolerant evaluation. The results indicated that the reduction in yield were significant fearfully in all varieties of potato. The reduction rate of yield range between 62. 14 % and 90. 74 %. There were obvious differences between varieties of shade-tolerance. The variety of ‘Zhongshu20 'was the most shade-tolerant,the second shade-tolerance varieties were the ‘Woff', ‘Qingshu9', ‘Favorite', and the least shade-tolerant variety was the ‘Hezuo88'. From the point of tuber quality influence, dry matter and starch content all decreased, however, the vast majority of potato cultivars protein content increased after shading treatment. [ABSTRACT FROM AUTHOR]