引用本文:张 宁,张 如,吴 萍,任丽轩,徐国华.根系分泌物在西瓜/旱作水稻间作减轻西瓜枯萎病中的响应[J].土壤学报,2014,51(3):585-593. DOI:10.11766/trxb201304110169
Zhang Ning,Zhang Ru,Wu Ping,Ren Lixuan,Xu Guohua.Response of root exudates to watermelon/aerobic rice intercropping oriented to alleviate watermelon Fusarium wilt[J].Acta Pedologica Sinica,2014,51(3):585-593. DOI:10.11766/trxb201304110169
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根系分泌物在西瓜/旱作水稻间作减轻西瓜枯萎病中的响应
张 宁, 张 如, 吴 萍, 任丽轩, 徐国华
南京农业大学资源与环境科学学院
摘要:
采用盆栽的方法,研究了西瓜/旱作水稻间作对西瓜枯萎病和西瓜根系分泌物中酚酸、氨基酸、有机酸种类和含量的影响。结果表明:与对照相比,接种西瓜专化型尖孢镰刀菌(Fusarium oxysporum f. sp. niveum,FON)显著提高了西瓜根系分泌物中酚酸的含量,增加了酚酸的种类如香豆酸,当西瓜/旱作水稻间作时,大部分酚酸的分泌量降低。在接种FON的条件下,西瓜/旱作水稻间作较单作显著降低西瓜根系分泌物中酚酸含量。与对照相比,接种FON提高了西瓜根系分泌中氨基酸的含量,而在西瓜/旱作水稻间作条件下接种FON时,西瓜根分泌物中氨基酸含量没有变化。与对照相比,接种FON显著提高了西瓜根系分泌有机酸的量,当西瓜/旱作水稻间作时,大部分有机酸分泌量降低。在接种FON的条件下,西瓜/旱作水稻间作较单作降低了西瓜根系分泌物中有机酸含量。总之,接种FON提高了西瓜根系分泌酚酸、氨基酸和有机酸的量,西瓜/旱作水稻间作降低西瓜枯萎病发病率和发病指数,并维持西瓜根系分泌酚酸、氨基酸和有机酸的量不增加。因此,西瓜/旱作水稻间作减轻西瓜枯萎病与西瓜根分泌物的调节有关。
关键词:  旱作水稻  间作  西瓜枯萎病  根系分泌物  酚酸  氨基酸
基金项目:国家自然科学基金项目(30871599)和农业部公益性行业科研专项(2012013007)资助
Response of root exudates to watermelon/aerobic rice intercropping oriented to alleviate watermelon Fusarium wilt
Zhang Ning, Zhang Ru, Wu Ping, Ren Lixuan, Xu Guohua
Nanjing Agricultural University
Abstract:
Watermelon is susceptible to wilt disease under continuous monocropping management. Watermelon/aerobic rice intercropping can alleviate watermelon wilt disease in continuous management soil. However, the mechanism is not very clear. A pot experiment was carried out to investigate effects of watermelon/aerobic rice intercropping on composition and contents of watermelon root exudates, such as phenolic acids amino acids and organic acids. Results show that watermelon wilt disease was alleviatedunder watermelon/aerobic rice intercropping condition. Compared with control, the treatment of inoculation with FON (Fusarium oxysporum f. sp. niveum)significantly increased the content of phenolic acids in the root exudates, especially coumaric acids, while the treatment of watermelon/aerobic rice intercropping reduced the exudation of most phenolic acids. Even in pots inoculated with FON, watermelon/aerobic rice intercropping significantly reduced the content of phenolic acids in the root exudates. Compared with control, FON inoculation increased the content of amino acids in watermelon root exudates, but did not in pots under watermelon/aerobic rice intercropping condition. And FON inoculation also increased significantly the volume of organic acids in watermelon root exudates, whereas watermelon/aerobic rice intercropping reduced the exudation of most of the organic acids and even in pots inoculated with FON. In conclusion, watermelon/ aerobic rice intercropping may alleviate watermelon wilt disease, which is held to be related to the variation of the composition and volume of the exudates from watermelon roots.
Key words:  Aerobica rice  Intercropping  Watermelon wilt disease  Root exudates  Phenolic acids  Amino acids