Impacts of genetic selection on Sequoia sempervirens mini-cutting rooting and initial growth in the field

IF 1.5 4区农林科学 Q2 FORESTRY

New Zealand Journal of Forestry Science Pub Date : 2021-09-04 DOI:10.33494/nzjfs512021x84x

Queli Cristina Lovatel, Gabriel Teixeira da Rosa, Alexandra Cristina Schatz Sá, Betel Cavalcante Lopes, Erasmo Luis Tonett, R. Dias, Mariane de Oliveira Pereira, M. Navroski

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引用次数: 0

Abstract

Background: Vegetative propagation from superior individuals allows multiple copies of plants that are genetically identical to the parent plant to be obtained. However, vegetative propagation success varies among individual genotypes, with some clones having more difficulty forming roots than others. The aim of this study was to evaluate the genetic gain in Sequoia sempervirens (D.Don) Endl. clones using parameters describing vegetative propagation success and initial growth in field. Methods: Vegetative propagation success was quantified for 16 clones in a completely randomised design consisting of 10 replications, each containing 10 mini-cuttings. At 90 days, rooting (RT), survival (SV) and the number of new shoots (NS) were evaluated. Performance after planting in the field was assessed using 13 clones from the previous experiment, arranged in linear parcels of 10 plants with 8 replicates. After 18 months, survival (SV), stem diameter (SD), height (H) and dominance breakdown (DB) were assessed. Estimates of variance components, heritability and genetic correlations were obtained using the Selegen-REML/BLUP software. Results: The mini cuttings of the 16 clones had a coefficient of genetic variation (CVgi%) of 32.32% for RT, 5.44% for SV and 5.35% for NS. The heritability of the total genetic effects (H2 g) for RT was 0.68. The clones with the best predicted genotypic classifications for the characteristics evaluated in the field were A116, A140 and A138 for SV, A126, A140 and A138 for SD, A138, A140 and A117 for H and A138, A228 and A116 for DB. Conclusions: In general, it was possible to obtain high genetic gain for rooting and medium gain for dendrometric variables in the field.

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遗传选择对Sequoia semperverrens小型扦插生根和田间初始生长的影响

背景:优势个体的无性繁殖可以获得与亲本植物基因相同的植株的多个副本。然而，无性繁殖的成功与否因个体基因型而异，有些无性繁殖比其他无性繁殖更难形成根。本研究旨在评价红杉(Sequoia sempervirens)的遗传增益。利用参数描述无性繁殖成功和田间初期生长的无性克隆。方法:采用完全随机设计，10个重复，每个重复10个迷你插条，对16个无性繁殖无性繁殖成功率进行量化。90 d时，测定生根(RT)、成活率(SV)和新芽数(NS)。采用先前试验的13个无性系，每10个无性系8个重复，排成线性小块，评估种植后的田间表现。18个月后，评估生存(SV)、茎粗(SD)、高度(H)和优势度分解(DB)。使用seleggen - reml /BLUP软件获得方差成分、遗传力和遗传相关性的估计。结果:16个无性系扦插的遗传变异系数(CVgi%)分别为:RT型32.32%、SV型5.44%、NS型5.35%。RT总遗传效应(H2 g)的遗传力为0.68。田间性状预测最佳的克隆为SV的A116、A140和A138, SD的A126、A140和A138, H的A138、A140和A117, DB的A138、A228和A116。结论:一般来说，在田间生根可以获得较高的遗传增益，而在树木变量上可以获得中等增益。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

New Zealand Journal of Forestry Science FORESTRY-

CiteScore

2.20

自引率

13.30%

发文量

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.