Mating system and inbreeding depression in Hymenaea stigonocarpa

IF 1.9 3区生物学 Q2 FORESTRY Tree Genetics & Genomes Pub Date : 2024-01-30 DOI:10.1007/s11295-024-01639-9

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Abstract

In tree species, inbreeding due to selfing or biparental mating may decrease offspring adaptation and growth due to inbreeding depression (ID). Degenerative effects of ID, mainly reduction in productivity and survival, are undesirable for ex-situ conservation, improvement, and environmental and commercial reforestation of tree species. The effects of ID resulting from self-fertilization and biparental inbreeding were assessed for the traits cylindrical volume and survival in juvenile individuals of Hymenaea stigonocarpa in a progeny test (0.83 ha) at 4 and 7 years of age. The progeny test was established for ex situ conservation in the state of Mato Grosso, Brazil, and was based on seeds collected from a wild population. Nine microsatellite loci were used to genotype 48 adult (plot = 4.3 ha) and 612 juvenile samples to determine spatial genetic structure (for adults), inbreeding, mating system, and pollen dispersal pattern. Spatial genetic structure was observed up to 82 m. Reproduction occurred mainly by outcrossing, with low rates of selfing (7.5%) and biparental inbreeding (13.2%). Mating was not random due to the fat-tail pollen dispersal pattern, resulting in high pollen immigration (70.1%) and low mean pollen dispersal distance (105 m) within the sample area. Inbreeding was observed only in juveniles, indicating selection against inbred individuals between juvenile and adult stages. The volume trait showed higher ID for biparental inbreeding (41.5–44.0%) than for self-fertilization (29.1–42.6%). Volume also showed greater ID than survival. Our results show that even low rates of selfing and biparental inbreeding can decrease the productivity of H. stigonocarpa plantations.

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石莲花的交配系统和近亲繁殖抑制作用

摘要在树种中，自交或双亲交配导致的近亲繁殖可能会因近亲繁殖抑制（ID）而降低后代的适应性和生长。近交抑郁的退化效应（主要是生产力和存活率的降低）对于树种的就地保护、改良以及环境和商业再造林都是不可取的。在一项后代试验（0.83 公顷）中，评估了自交和双亲近亲繁殖对石蒜（Hymenaea stigonocarpa）幼树个体在 4 岁和 7 岁时的圆柱形体积和存活率的影响。后代试验是为巴西马托格罗索州的异地保护而建立的，以从野生种群中采集的种子为基础。利用九个微卫星位点对 48 个成年样本（小区面积 = 4.3 公顷）和 612 个幼年样本进行基因分型，以确定空间遗传结构（成年样本）、近交、交配系统和花粉传播模式。繁殖主要通过外交进行，自交率（7.5%）和双亲近交率（13.2%）较低。由于肥尾花粉散播模式，交配不是随机的，导致样本区内花粉移民率高（70.1%），平均花粉散播距离低（105 米）。仅在幼体中观察到近交现象，这表明在幼体和成体阶段对近交个体进行了选择。与自交（29.1-42.6%）相比，双亲近交（41.5-44.0%）对体积性状的影响更大。体积性状的 ID 也高于存活率。我们的研究结果表明，即使自交率和双亲近交率较低，也会降低 H. stigonocarpa 种植园的生产力。

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来源期刊

Tree Genetics & Genomes 生物-林学

CiteScore

4.40

自引率

4.20%

发文量

审稿时长

2 months

期刊介绍： Tree Genetics and Genomes is an international, peer-reviewed journal, which provides for the rapid publication of high quality papers covering the areas of forest and horticultural tree genetics and genomics. Topics covered in this journal include: Structural, functional and comparative genomics Evolutionary, population and quantitative genetics Ecological and physiological genetics Molecular, cellular and developmental genetics Conservation and restoration genetics Breeding and germplasm development Bioinformatics and databases Tree Genetics and Genomes publishes four types of papers: (1) Original Paper (2) Review (3) Opinion Paper (4) Short Communication.