自花授粉对番石榴近交系遗传多样性的影响

IF 1.6 3区 农林科学 Q2 AGRONOMY Euphytica Pub Date : 2024-07-30 DOI:10.1007/s10681-024-03389-0
Joameson Antunes Lima, Alexandre Pio Viana, Caio Cézar Guedes Correa, Debora Souza Mendes, Eileen Azevedo Santos, Flávia Alves da Silva, Letícia da Silva Araújo, Luis Carlos Loose Coelho, Mariana Zandomênico Mangeiro, Natália Veras Reis, Natan Ramos Cavalcante, Rogério Figueiredo Daher, Thays Correa Costa
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引用次数: 0

摘要

在番石榴(Psidium guajava)中,自花授粉对果实数量性状的影响尚不完全清楚,需要进一步研究。本研究旨在估计自花授粉对番石榴 S1 和 S2 近交系果实性状的影响,并探讨其对遗传多样性的潜在影响。通过对双亲杂交后代进行自交,产生了 18 个 S1 家系;通过对 S1 家系的优良基因型进行自交,产生了 10 个 S2 家系。实验在巴西里约热内卢伊塔奥卡拉市的 Ilha Barra do Pomba 实验站进行。试验采用随机完全区组设计,每小区有三个重复和十株植物。评估的性状包括果重、长度、直径、长径比、内果皮厚度、中果皮厚度、果肉重量和可溶性固形物含量。对数据进行了个体方差分析,得出了 S1 和 S2 代的预测平均性状值,以及相关性和同源性估计值。利用马哈拉诺比斯距离和 UPGMA 聚类分析评估了遗传多样性,并针对所评估的性状绘制了近交种群间的比较盒图。盒图分析表明,大多数评估的性状具有对称性,这表明自交策略导致了数据的一致性。方差分析表明,所有性状在统计学上都存在显著差异,突显了 S1 和 S2 种群之间的变异性。果实和果肉重量显示出较高的同源性,分别为 90.86 和 102.59,这与 S2 群体中果实性状的增加有关,表明它们在固定有利等位基因方面的重要性。果实重量、长度和直径、内果皮厚度和中果皮厚度的相关性很强,超过了 0.70。通过 Mahalanobis 距离进行的遗传多样性评估表明,与 S1 群体相比,S2 群体的遗传变异性有所降低。不过,这种减少并没有明显影响 S2 群体的平均表现。结果表明,两代自花授粉并没有对评价性状的表型值产生负面影响。
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Impact of self-pollination on the genetic diversity of inbred families of Psidium guajava L

In guava (Psidium guajava), the impact of self-pollination on the quantitative traits of the fruits is not fully understood, necessitating further investigation. This study aimed to estimate the effects of selfing on fruit traits in S1 and S2 inbred families of guava and to explore potential impacts on genetic diversity. Eighteen S1 families were generated through selfing of progenies from biparental crosses, and ten S2 families were produced by selfing superior genotypes from S1 families. The experiment was conducted at the Experimental Station of Ilha Barra do Pomba, in the municipality of Itaocara-Rio de Janeiro, Brazil. It utilized a randomized complete block design, with three replications and ten plants per plot. Evaluated traits included fruit weight, length, diameter, length-diameter ratio, endocarp thickness, mesocarp thickness, pulp weight, and soluble solids content. The data underwent individual analysis of variance, yielding predicted mean trait values for S1 and S2 generations, alongside correlation and homozygosity estimates. Genetic diversity was assessed using Mahalanobis distance and UPGMA cluster analysis, and comparative box plots between inbred populations were created for the evaluated traits. Box plot analysis revealed symmetry in most evaluated traits, suggesting uniformity in the data due to the selfing strategy. Analysis of variance indicated statistically significant differences in all traits, highlighting variability between populations S1 and S2. Fruit and pulp weights exhibited high homozygosity levels, with values of 90.86 and 102.59 respectively, linked to increased fruit traits in the S2 population, indicating their importance in the fixation of favorable alleles. Fruit weight, length, and diameter, endocarp thickness, and mesocarp thickness showed strong correlations, exceeding 0.70. Genetic diversity assessment via Mahalanobis distance indicated a decrease in genetic variability, evidenced by fewer groups in S2 compared to the S1 population. However, this reduction did not noticeably affect the average performance of the S2 population. The results indicate that the two generations of self-pollination did not negatively affect the phenotypic values of the evaluated traits.

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来源期刊
Euphytica
Euphytica 农林科学-农艺学
CiteScore
3.80
自引率
5.30%
发文量
157
审稿时长
4.5 months
期刊介绍: Euphytica is an international journal on theoretical and applied aspects of plant breeding. It publishes critical reviews and papers on the results of original research related to plant breeding. The integration of modern and traditional plant breeding is a growing field of research using transgenic crop plants and/or marker assisted breeding in combination with traditional breeding tools. The content should cover the interests of researchers directly or indirectly involved in plant breeding, at universities, breeding institutes, seed industries, plant biotech companies and industries using plant raw materials, and promote stability, adaptability and sustainability in agriculture and agro-industries.
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