富水大豆耐冷致种子开裂的新QTL。

IF 2 4区 农林科学 Q2 AGRONOMY Breeding Science Pub Date : 2023-04-01 DOI:10.1270/jsbbs.22066
Naoya Yamaguchi, Yumi Sato, Fumio Taguchi-Shiobara, Kazuki Yamashita, Michio Kawasaki, Masao Ishimoto, Mineo Senda
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引用次数: 0

摘要

大豆开花后低温会导致种子开裂。在此之前,我们报道了原花青素在种皮背面的积累,受I位点控制,可能导致种子开裂;在Toiku 248中,I位点的IcIc等位基因纯合子赋予了SC耐受性。为了发现与SC耐受性相关的新基因,我们对Toyomizuki(基因型II)的SC耐受性的物理和遗传机制进行了评估。对种皮的组织学和质地分析表明,在低温下保持硬度和柔韧性的能力,无论背侧种皮中原花青素的积累,都有助于Toyomizuki的SC耐受性。这表明富井和富田248对SC的耐受性机制存在差异。通过对重组自交系的数量性状位点(QTL)分析,发现了一个与SC耐受性相关的新的、稳定的QTL。在剩余杂合系中证实了这一新的QTL qCS8-2与SC耐受性的关系。qCS8-2与qCS8-1之间的距离估计为2-3 Mb, qCS8-1可能是Ic等位基因,因此有可能将这些区域金字塔化,以开发具有更高耐SC性的新品种。
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A novel QTL associated with tolerance to cold-induced seed cracking in the soybean cultivar Toyomizuki.

Low temperatures after flowering cause seed cracking (SC) in soybean. Previously, we reported that proanthocyanidin accumulation on the dorsal side of the seed coat, controlled by the I locus, may lead to cracked seeds; and that homozygous IcIc alleles at the I locus confer SC tolerance in the line Toiku 248. To discover new genes related to SC tolerance, we evaluated the physical and genetic mechanisms of SC tolerance in the cultivar Toyomizuki (genotype II). Histological and texture analyses of the seed coat revealed that the ability to maintain hardness and flexibility under low temperature, regardless of proanthocyanidin accumulation in the dorsal seed coat, contributes to SC tolerance in Toyomizuki. This indicated that the SC tolerance mechanism differed between Toyomizuki and Toiku 248. A quantitative trait loci (QTL) analysis of recombinant inbred lines revealed a new, stable QTL related to SC tolerance. The relationship between this new QTL, designated as qCS8-2, and SC tolerance was confirmed in residual heterozygous lines. The distance between qCS8-2 and the previously identified QTL qCS8-1, which is likely the Ic allele, was estimated to be 2-3 Mb, so it will be possible to pyramid these regions to develop new cultivars with increased SC tolerance.

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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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