Field performance of progenies of Pinus radiata selected for resistance to Diplodia-associated shoot dieback

IF 1.5 4区 农林科学 Q2 FORESTRY New Zealand Journal of Forestry Science Pub Date : 2022-10-25 DOI:10.33494/nzjfs522022x217x
R. Burdon, C. Low
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Abstract

Background: A severe outbreak of Diplodia-associated dieback of Pinus radiata D.Don shoots in 1967 prompted a pilot programme of selection for resistance to dieback. Plus trees were selected in 1970 for absence of dieback, growth and tree form, and seed collected. Methods: Twenty open-pollinated progenies plus two control lots were field-tested on two sites, and assessed around 6.5 years after planting. Alternative measures of shoot dieback were recorded, as were dbhob and scores for growth and form variables. Data were analysed for seedlot differences, heritability estimates and various genetic correlations. Results: Dieback at one site allowed good resolution of progeny differences, whatever the dieback measure. Remarkably, no response to field selection for resistance was evident, unlike in a glasshouse inoculation trial. Nor did progeny rankings correlate with those in the inoculation trial. Between the trial sites no clear seedlot rank changes were evident for any trait. Conclusions: The disparity with results from the inoculation trial is unexplained, although a role of endophyte status is postulated. Together with non-recurrence of past dieback outbreaks, the disparity means that selection for field resistance is not promising.
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辐射松后代抗Diplodia相关梢枯病的田间表现
背景:1967年,辐射松(Pinus radiata D.Don)与Diplodia相关的枯死严重爆发,促使开展了一项抗枯死筛选试验计划。此外,1970年选择了没有枯死、生长和树形的树木,并收集了种子。方法:在两个地点对20个开放授粉后代和两个对照组进行田间试验,并在种植后6.5年左右进行评估。记录了枝条枯死的替代测量,以及生长和形状变量的dbhob和得分。对数据进行了分析,以了解种群差异、遗传力估计和各种遗传相关性。结果:在一个位点的枯死可以很好地解决后代差异,无论枯死是什么衡量标准。值得注意的是,与温室接种试验不同,对田间选择的抗性没有明显的反应。后代排名也与接种试验中的排名无关。在试验地点之间,任何性状都没有明显的种子区等级变化。结论:尽管内生菌状态的作用是假定的,但与接种试验结果的差异是无法解释的。再加上过去的死灰复燃疫情没有复发,这种差异意味着选择田间抗性是没有希望的。
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来源期刊
CiteScore
2.20
自引率
13.30%
发文量
20
审稿时长
39 weeks
期刊介绍: The New Zealand Journal of Forestry Science is an international journal covering the breadth of forestry science. Planted forests are a particular focus but manuscripts on a wide range of forestry topics will also be considered. The journal''s scope covers forestry species, which are those capable of reaching at least five metres in height at maturity in the place they are located, but not grown or managed primarily for fruit or nut production.
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