棉 花 学 报     Cotton Science   2008，20(3)：186-191

Effect of Protein Elicitor from Alternaria Tenuissima on Main Characters of Cotton and Enzymatic Protection System of Plant
ZHANG Zhi-gang^1，2，3，QIU De-wen^2*，GUAN Chun-yun¹，MEI Zheng-ding³，YANG Xiao-ping³，LIU Kai-zhi³，HE Yun-xin³
(1.Hunan Agriculture University，Changsha 410128，China；2.Institute of Plant Protection，Chinese Academy of Agricultural Sciences，Beijing 100081，China；3.Hunan Cotton Research Institute，Changde 415000，China )

Abstract：The effect of protein elicitor from Alternaria tenuissima on cotton fiber quality and biological characteristic of plant is described. By analyzing the main agronomic and economical characters，the boll number was significantly promoted by Alternaria protein elicitor. The plant height ，weight of single bell，lint-index，seed-index and lint-percent were increased in different degrees， whereas the weight of single boll hull was decreased. The protein elicitor promoted cotton plant to be precocious,and increased cotton yield. By the treatment of soaking seeds，the unginned-yield and lint-yield reached 3800.6 kg·hm^-2 and 1596.2kg·hm^-2，respectively，which were 15.12% and 17.19% higher than those of control. As to the fiber quality，many parameters were remarkedly improved by applying the protein activator at the right moment with the appropriate concentration. The treatment of soaking seeds plus spraying at bud period had the top comprehensive value，which was 6.1% higher than that of control. In the aspect of biological characteristic，the results showed that Alternaria protein elicitor influenced enzyme activity of POD，NR，SOD, and MDH in various degrees. POD，NR, and SOD increased in all treatments，while MDA decreased. Based on the above results，possible role of inducing the plant growth and enhancing the cotton fiber quality with Alternaria protein elicitor was discussed.
Key words：protein elicitor；Alternaria tenuissima; cotton; fiber quality; biological characteristic
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