Genetic parameter estimates and selection gain for multiple traits in white Guinea yam (Dioscorea rotundata) in Ghana.

IF 1.6 3区 农林科学 Q2 AGRONOMY
Euphytica Pub Date : 2025-01-01 Epub Date: 2025-02-06 DOI:10.1007/s10681-025-03467-x
Kwabena Darkwa, Emmanuel Amponsah Adjei, Emmanuel B Chamba, Alhassan Sayibu, Isaac Kodzo Amegbor, Freda Ansaah Agyapong, Ziblila Sayibu, Ibrahim Sayibu, Martain Kangmennaang, Muazu Issifu, Paterne A Agre, Patrick Adebola, Asrat Asfaw
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Abstract

Quantifying selection gains enables a more targeted assessment of breeding program effectiveness, highlighting opportunities for strategic improvement and optimized genetic advancement in white Guinea Yam. This study assessed genetic parameters and gain for key traits in a white Guinea yam (D. rotundata) breeding population. A total of 81 genotypes were evaluated for two seasons using a 9 × 9 lattice design with three replicates. Data was collected on yam mosaic virus disease severity, tuber yield and tuber dry content for genetic analysis. Broad sense heritability was generally high (> 60) for most of the traits. At the same time, the corresponding genetic advance as a percentage of the mean was exceptionally high (30.28-93.96%) for tuber yield, tuber flesh oxidation, average tuber weight and number of tubers per plant, suggesting additive genetic effects. A multi-trait selection index of the 5% highest performing genotypes revealed positive genetic gain for plant vigour, tuber length, and width, tuber weight per plant, average tuber weight and fresh tuber yield. The genetic gain was, however, negative for tuber dry matter content compared to the check varieties, necessitating a modification of the current breeding scheme such that post-harvest food quality is not sacrificed for tuber yield. Ranking of the breeding lines based on the multi-trait selection index identified four lines (TDr1700004_014, TDr1700004_113, TDr1700001_112 and TDr1700002_090) with high genetic merits for all the economic traits. These lines can be used as potential trait progenitors and evaluated further for possible release as new varieties. Our results decipher the genetic control and provide an overview of the performance of the breeding program for key traits in white Guinea yam.

Supplementary information: The online version contains supplementary material available at 10.1007/s10681-025-03467-x.

加纳白几内亚山药(Dioscorea rotundata)多个性状的遗传参数估计和选择增益。
量化选择收益可以更有针对性地评估育种计划的有效性,突出战略性改进和优化几内亚白山药遗传进步的机会。本研究评估了白色几内亚山药(D. rotundata)育种群体的遗传参数和关键性状的增益。采用3个重复的9 × 9格子设计,对81个基因型进行了2个季节的评估。收集了薯蓣花叶病毒病严重程度、块茎产量和块茎干含量的遗传分析资料。大多数性状的广义遗传力普遍较高(bb0 ~ 60)。与此同时,在块茎产量、块茎肉氧化、平均块茎重和单株块茎数上,相应的遗传进步占平均值的百分比异常高(30.28-93.96%),表明遗传效应是加性的。5%最高表现基因型的多性状选择指数显示,在植株活力、块茎长、块茎宽、单株块茎重、平均块茎重和鲜块茎产量等性状上遗传增益均为正。然而,与对照品种相比,遗传增益对块茎干物质含量是负的,这就需要对目前的育种方案进行修改,以便不牺牲收获后的食品质量来换取块茎产量。根据多性状选择指数对选育品系进行排序,发现4个品系(TDr1700004_014、TDr1700004_113、TDr1700001_112和TDr1700002_090)在所有经济性状上均具有较高的遗传优势。这些品系可作为潜在的性状祖系,并可作为新品种进一步评价。我们的研究结果揭示了白几内亚山药的遗传控制,并提供了关键性状育种计划的总体表现。补充资料:在线版本包含补充资料,地址为10.1007/s10681-025-03467-x。
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
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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