Polyploid QTL-seq revealed multiple QTLs controlling steamed tuber texture and starch gelatinization temperature in sweetpotato.

IF 2 4区 农林科学 Q2 AGRONOMY Breeding Science Pub Date : 2024-04-01 Epub Date: 2024-02-29 DOI:10.1270/jsbbs.23060
Hiromoto Yamakawa, Tatsumi Mizubayashi, Masaru Tanaka
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Abstract

Sweetpotato (Ipomoea batatas) includes diverse cultivars with flesh textures ranging from dry to moist. Moist-fleshed cultivars often contain starch with a lower gelatinization temperature (GT). To elucidate the genetic determinants of flesh texture and starch GT, we conducted a QTL analysis using F1 progenies obtained from a cross between dry-fleshed and moist-fleshed cultivars, 'Benikomachi' (BK) and 'Amahazuki' (AH), by using an updated polyploid QTL-seq pipeline. Flesh texture was assessed based on the wet area ratio (WAR) observed on the cut surface of steamed tubers, as progenies with dry and moist flesh exhibited low and high WAR values, respectively, demonstrating a strong correlation. Three QTLs were found to regulate the WAR. Notably, two AH-derived alleles at 4.30 Mb on Itr_chr05 and 21.01 Mb on Itr_chr07, along with a BK-derived allele at 2.89 Mb on Itr_chr15, were associated with increased WAR. Starch GT, which displayed no correlation with either flesh texture or WAR, was distinctly influenced by two QTLs: a GT-increasing BK-derived allele at 1.74 Mb on Itr_chr05 and a GT-decreasing AH-derived allele at 30.16 Mb on Itr_chr12. Consequently, we developed DNA markers linked to WAR, offering a promising avenue for the targeted breeding of sweetpotato with the desired flesh textures.

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多倍体 QTL-seq 发现了多个控制甘薯蒸煮块茎质地和淀粉糊化温度的 QTLs。
甘薯(Ipomoea batatas)包括多种栽培品种,其果肉质地从干燥到湿润不等。湿肉栽培品种通常含有糊化温度(GT)较低的淀粉。为了阐明果肉质地和淀粉GT的遗传决定因素,我们利用干肉栽培品种'Benikomachi'(BK)和湿肉栽培品种'Amahazuki'(AH)杂交得到的F1后代,使用更新的多倍体QTL-seq管道进行了QTL分析。果肉质地是根据蒸熟块茎切面上观察到的湿面积比(WAR)来评估的,因为干果肉和湿果肉的后代分别表现出低和高的 WAR 值,显示出很强的相关性。研究发现,有三个 QTLs 可调控 WAR。值得注意的是,Itr_chr05 上 4.30 Mb 和 Itr_chr07 上 21.01 Mb 处的两个 AH 衍生等位基因以及 Itr_chr15 上 2.89 Mb 处的一个 BK 衍生等位基因与 WAR 值的增加有关。淀粉GT与果肉质地或WAR都没有相关性,但它明显受到两个QTL的影响:Itr_chr05上1.74 Mb处的一个GT增加的BK衍生等位基因和Itr_chr12上30.16 Mb处的一个GT减少的AH衍生等位基因。因此,我们开发出了与 WAR 相关联的 DNA 标记,为定向培育具有理想肉质的甘薯提供了一条很有前景的途径。
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来源期刊
Breeding Science
Breeding Science 农林科学-农艺学
CiteScore
4.90
自引率
4.20%
发文量
37
审稿时长
1.5 months
期刊介绍: Breeding Science is published by the Japanese Society of Breeding. Breeding Science publishes research papers, notes and reviews related to breeding. Research Papers are standard original articles. Notes report new cultivars, breeding lines, germplasms, genetic stocks, mapping populations, database, software, and techniques significant and useful for breeding. Reviews summarize recent and historical events related breeding. Manuscripts should be submitted by corresponding author. Corresponding author must have obtained permission from all authors prior to submission. Correspondence, proofs, and charges of excess page and color figures should be handled by the corresponding author.
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