Genetic Parameter Estimates from a Polymix Breeding Population of Pinus taeda L.

IF 1.5 4区 农林科学 Q2 FORESTRY
M. Alan, K. Payn, S. McKeand, F. Isik
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Abstract

Estimation of genetic parameters from progeny testing is essential for many important decisions in forest tree breeding. In this study, we estimated heritabilities, trait-trait genetic correlations, and genotype by environment (GxE) interactions using a large multi-environmental data set of Pinus taeda L. in the southern United States. In the study, 284 parents were pollinated with a pollen mix and were field tested in four different test series. A total of twenty tests (two to seven tests per series) were established using randomized complete block design with single tree plots. Half-sib family-mean heritability estimates within individual test series varied considerably for all the traits. Pooled estimates of half-sib family-mean heritability estimates across series were 0.81 for fusiform rust incidence; they were relatively lower for tree height (0.68), diameter at breast height (DBH; 0.66), and stem straightness (0.58). Genetic correlations between pairs of traits were low except for height and diameter, which had a high genetic correlation (0.79). Additive genetic correlations between pairs of sites within test series (as a measure of GxE) varied. The pooled estimates ranged between 0.65 (DBH) to 0.80 (fusiform rust). The results suggest that polymix mating is efficient for parental selection in Pinus taeda L. and for deployment in the seed orchards. Study Implications: This study focused on genetic variation in the Piedmont breeding population of Pinus taeda L. in the United States. The Piedmont population was developed for more inland and colder regions of the species. Fusiform rust disease incidence of pine species of southeastern United States is a major threat to pine plantations. Understanding the level of genetic control on disease outcome is vital to develop sound breeding strategies and recommend deployment practices to mitigate the economic loss of landowners. The results provide valuable information to breeders to select disease-resistant genotypes to breed and put into seed orchards to mass-produce stock for planting.
红松多交育种群体遗传参数的估算。
从子代测试中估计遗传参数对林木育种中的许多重要决策至关重要。在这项研究中,我们利用美国南部的一个大型多环境数据集估计了遗传力、性状-性状遗传相关性和环境相互作用的基因型(GxE)。在这项研究中,284个亲本用花粉混合物授粉,并在四个不同的试验系列中进行田间试验。采用单树图随机完全区组设计,共建立了20个试验(每个系列2 ~ 7个试验)。在单个测试系列中,对所有性状的半同胞家庭平均遗传力估计差异很大。梭形锈病发病率的同父异母家族平均遗传力估计为0.81;树高(0.68)、胸径(DBH)相对较低;0.66),阀杆直线度(0.58)。除株高和株径具有较高的遗传相关(0.79)外,其余性状间的遗传相关均较低。测试序列中位点对之间的加性遗传相关性(作为GxE的测量)各不相同。综合估计范围在0.65 (DBH)到0.80(梭形锈病)之间。结果表明,多交杂交对红松的亲本选择和种子园部署具有较好的效果。研究意义:本研究对美国山前松林(Pinus taeda L.)繁殖群体的遗传变异进行了研究。皮埃蒙特种群在内陆和较冷的地区发展。美国东南部松树品种的梭形锈病发病率是松树人工林的主要威胁。了解对疾病结果的遗传控制水平对于制定合理的育种战略和建议部署实践以减轻土地所有者的经济损失至关重要。研究结果为育种人员选择抗病基因型进行育种和种子园批量生产砧木提供了有价值的信息。
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来源期刊
Forest Science
Forest Science 农林科学-林学
CiteScore
2.80
自引率
7.10%
发文量
45
审稿时长
3 months
期刊介绍: Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management. Forest Science is published bimonthly in February, April, June, August, October, and December.
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