Expression of induced systemic resistance in poinsettia cuttings against Rhizoctonia stem rot by treatment of stock plants with binucleate Rhizoctonia
Expression of induced systemic resistance in poinsettia cuttings against Rhizoctonia stem rot by treatment of stock plants with binucleate Rhizoctonia
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DOI：
10.1016/s1049-9644(02)00185-8
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发表时间：
2003-05-01
影响因子：
4.2
通讯作者：
Benson, DM
中科院分区：
文献类型：
--
作者：
Hwang, J;Benson, DM
用双核丝核菌（BNR）处理过的砧木植株扦插，研究了三个一品红品种（V14 Glory、Freedom Red和Angelica白色）对丝核菌茎腐病的诱导抗性。用BNR处理7 d后，V14 Glory的扦插苗对茎腐病的抗性被诱导，而自由红和当归白色则要到10 d或更长时间后才表现出抗性。没有一个品种表现出对茎腐病的抗性时，扦插采取的股票植物与BNR处理，只有3或5天前繁殖。BNR在一品红根组织上的种群动态与诱导抗性的表达一致。在第5天和第7天之间，在所有品种中观察到BNR根定殖的急剧增加。综合使用BNR和洋葱伯克霍尔德氏菌，以前的特点是作为一个茎腐病控制剂在一品红繁殖，进行了评估，以测试增强对茎腐病的抗性。用B处理的生根带繁殖BNR处理的砧木插条时，没有观察到对茎腐病防治的加性效应。洋葱与用B处理的根带中繁殖的插条相比。洋葱单独。我们的研究结果可能是第一个证明诱导的系统性抗性BNR真菌在植被繁殖过程中的生防剂应用到一个股票植物的根是能够保护插条从立枯病菌在繁殖过程中。(C)2002 Elsevier Science（美国）。All rights reserved.
Three cultivars of poinsettia (V14 Glory, Freedom Red, and Angelica White) were evaluated for induction of host resistance to Rhizoctonia stem rot in cuttings acquired from stock plants treated with binucleate Rhizoctonia (BNR) in a Pesta formulation. Resistance to stem rot in cuttings of V14 Glory was induced within 7 days of treatment with BNR while Freedom Red and Angelica White did not express resistance until 10 or more days after application of BNR to stock plants. None of the cultivars expressed resistance to stem rot when cuttings were taken from stock plants that were treated with BNR for only 3 or 5 days before propagation. Population dynamics of BNR on poinsettia root tissue were consistent with the expression of induced resistance. A dramatic increase of root colonization by BNR was observed in all cultivars between day 5 and 7. The integrated use of both BNR and Burkholderia cepacia, previously characterized as a stem rot control agent during poinsettia propagation, was evaluated to test for enhanced resistance against stem rot. No additive effect on stem rot control was observed when cuttings taken from stock plants treated with BNR were propagated in rooting strips treated with B. cepacia compared to cuttings propagated in root strips treated with B. cepacia alone. Our results may be the first to demonstrate induced systemic resistance by BNR fungi during vegetation propagation where the biocontrol agent applied to roots of a stock plant was able to protect cuttings from Rhizoctonia solani during propagation. (C) 2002 Elsevier Science (USA). All rights reserved.