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Tolerance of Acacia populations following inoculation with the Ceratocystis canker and wilt pathogen in Vietnam
Tree Genetics & Genomes ( IF 2.4 ) Pub Date : 2020-09-26 , DOI: 10.1007/s11295-020-01470-y
Jeremy Brawner , Nguyen Minh Chi , Nghiem Chi , Morag Glen , Caroline Mohammed , Pham Quang Thu , Nguyen Duc Kien

Inoculations of two Acacia populations were used to estimate the level of genetic control for tolerance to Ceratocystis canker and wilt disease following inoculation with the causal pathogen, Ceratocystis manginecans. The first screening utilised a range of clones commonly established in Vietnam along with new candidate clones and provided evidence that variation in wilt symptoms is under a moderate level of genetic control in current deployment populations. Subsequent assessments of tolerance in a pedigreed Acacia auriculiformis progeny trial indicated that internal lesion length assessments were less influenced by seedling height and produced higher heritability estimates than external lesion length assessments. Heritability estimates for damage to detached phyllodes following inoculation increased from 2 to 4 weeks, at which point many leaves were entirely damaged. Assessments of phyllode damage were more heritable than assessments of stem damage, and positive genetic correlations between stems and phyllode damage indicate that families will rank similarly for both traits. If validation trials confirm the results of this study in larger trees, screening as described herein may be used to develop acacia breeds with greater disease tolerance.



中文翻译:

在越南接种金黄色葡萄球菌溃疡病和枯萎病原菌后对金合欢种群的耐受性

接种致病性病原体(Ceratocystis manginecans)后,接种了两个金合欢种群,以评估其遗传控制水平,以控制对Ceratocystis溃疡和枯萎病的耐受性。第一次筛选利用了在越南通常建立的一系列克隆以及新的候选克隆,并提供了证据表明,在当前部署种群中,枯萎症状的变化处于中等水平的遗传控制之下。后来评估了纯种相思金合欢后代试验表明,与外部病灶长度评估相比,内部病灶长度评估受苗高的影响较小,产生的遗传力估计更高。接种后对分离的叶状体的损害的遗传力估计值从2周增加到4周,这时许多叶片完全受损。茎叶损伤的评估比茎叶损伤的评估更具遗传性,茎与叶茎损伤之间的正遗传相关性表明,两个性状的家庭排名相似。如果验证试验在更大的树木上证实了该研究的结果,则可以使用本文所述的筛选方法开发具有更高抗病性的相思树品种。

更新日期:2020-09-26
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