CAJ | 학술논문

[目的]探讨棉花不同生育期的生防菌组合防治棉花黄萎病效果，以期为植物其他土传病害的生物防治提供新的策略。[方法]分别筛选棉花苗期、现蕾期和结铃期的高抗黄萎病内生菌，测定其16SrDNA序列并进行比对分析，鉴定筛选出的3个菌株，探讨了该3个菌株在棉株内的定殖规律，并进行室内和田间防效测定。[结果]根据16SrDNA序列同源性，3个菌株分别鉴定为Paenibacilluspolymyx0YUPP．8、Paenibaeillusxy-lanilyticusYUPP-1和BacillussubtilisYUPP-2。定殖评价试验结果显示3个菌株均能顺利定殖于棉花体内，施用剂量与其在棉株内的定殖量具有正效应关系，在棉花苗期定殖量最高的菌株为YUPP．8，在棉花现蕾期定殖量最高的菌株为YUPP-1，在棉花结铃期定殖量最高的菌株为YuPP-2。室内盆栽抗病结果显示3个菌株联合处理的棉株在开花期未发病，单菌处理的棉株在苗期发病率分别为：6．7％（YUPP-8）、6．7％（YuPP．1）和13．3％（YUPP-2）；而此时对照的发病率高达80％。2010-2011年2年的小区防治试验结果表明3菌联合灌根处理效果优于单菌株施用效果，其中，2010年3菌联合灌根处理区棉花结铃期黄萎病发病率和病指分别为9．4％和6．5，对照分别为47．5％和32.8，2011年的结果趋势与2010年类似。但病害严重度更高一些。上述结果表明联合棉花各生育期的内生菌来防治棉花黄萎病具有巨大的应用潜力。[结论]该研究结果初步克服了目前生防菌开发中的缺陷，对其他植物土传病害的防治具有借鉴意义。
[목적]탐토면화불동생육기적생방균조합방치면화황위병효과，이기위식물기타토전병해적생물방치제공신적책략。[방법]분별사선면화묘기、현뢰기화결령기적고항황위병내생균，측정기16SrDNA서렬병진행비대분석，감정사선출적3개균주，탐토료해3개균주재면주내적정식규률，병진행실내화전간방효측정。[결과]근거16SrDNA서렬동원성，3개균주분별감정위Paenibacilluspolymyx0YUPP．8、Paenibaeillusxy-lanilyticusYUPP-1화BacillussubtilisYUPP-2。정식평개시험결과현시3개균주균능순리정식우면화체내，시용제량여기재면주내적정식량구유정효응관계，재면화묘기정식량최고적균주위YUPP．8，재면화현뢰기정식량최고적균주위YUPP-1，재면화결령기정식량최고적균주위YuPP-2。실내분재항병결과현시3개균주연합처리적면주재개화기미발병，단균처리적면주재묘기발병솔분별위：6．7％（YUPP-8）、6．7％（YuPP．1）화13．3％（YUPP-2）；이차시대조적발병솔고체80％。2010-2011년2년적소구방치시험결과표명3균연합관근처리효과우우단균주시용효과，기중，2010년3균연합관근처리구면화결령기황위병발병솔화병지분별위9．4％화6．5，대조분별위47．5％화32.8，2011년적결과추세여2010년유사。단병해엄중도경고일사。상술결과표명연합면화각생육기적내생균래방치면화황위병구유거대적응용잠력。[결론]해연구결과초보극복료목전생방균개발중적결함，대기타식물토전병해적방치구유차감의의。
[Objective] This study aimed to investigate the combined control effects of endophytic bacteria at different growth stages against cotton Verticfllium wilt and pro- vide a new strategy for the biocontrol of other soil-borne diseases. [Method] Endophytic bacteria with high resistance against Verticillium wilt were isolated from seedling, squaring and boll-setting cotton vascular, respectively. Their 16S rDNA se- quences were detected for comparative analysis. Three biocontrol strains were se- lected and identified, whose colonization roles in cotton plants were explored. The control efficiency was determined with indoor and field experiments. [Result] Accord- ing to the 16S rDNA sequence homology, the three strains were identified as Paeni- bacillus polyrnyxa YUPP-8, Paenibacillus xylanilyticus YUPP-1 and Bacillus subtilis YUPP-2, respectively. Results of colonization assessment showed that three strains all could be successfully colonized in cotton vascular. However, application amount had a positive effect on the number of colonized biocontrol bacteria in cotton, strain YUPP-8 had the largest number of colonized biocontrol bacteria in seedling period, strain YUPP-1 had the largest number of colonized biocontrol bacteria in squaring period, and strain YUPP-2 had the largest number of colonized biocontrol bacteria in boll-setting period. Indoor pot experiment showed that cotton plants in combined bio- control bacteria treatment group were not infected in flowing period, while Verticillium wilt morbidity rate of cotton treated with single strain in seedling period were 6.7% （YUPP-8）, 6.7% （YUPP-1） and 13.3% （YUPP-2）; however, Verticillium wilt morbidity rate wilt of the control reached 80%. Field experiment conducted during 2010-2011 showed that the combined application of three strains had better effect than separate application; specifically, Verticillium wilt morbidity rate and disease index of cotton in boll-setting period with combined application of three strains in 2010 were 9.4% and 6.5, respectively, while those in control group were 47.5% and 32.8; results in 2011 were similar to 2010, with higher disease severity. These results indicate that com- bined application of endophytic bacteria at different growth stages has great applica- tion potential in control of cotton Verticillium wilt. [Conclusion] This study preliminarily overcomes the defects in the application of biocontrol bacteria and provided reference for the prevention and treatment of other soil-borne diseases.