Pleiotropic effects of the rice qLTG3-1 allele: enhancing low-temperature germinability while reducing brown rice appearance quality

IF 1.6 3区 农林科学 Q2 AGRONOMY Euphytica Pub Date : 2024-07-31 DOI:10.1007/s10681-024-03388-1
Emiko Miura, Hidekazu Takahashi, Akio Watanabe, Kenji Ueda, Tomohiko Kawamoto, Kenji Sakurai, Hiromori Akagi
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Abstract

Rice quality has a major impact on its economic value, necessitating the breeding of high-quality grain varieties. In addition, varieties with superior germination and growth at low temperatures are required for direct sowing, which enables the low-cost production of rice. We developed Akikei770, a near-isogenic line from the high-quality, good-tasting cultivar Akitakomachi, carrying the qLTG3-1 gene from the Maratelli cultivar, which enhances low-temperature germinability. Although Akikei770 exhibited improved low-temperature germinability, it was inferior to Akitakomachi in appearance quality of brown rice and in eating quality of cooked rice. In Akikei770, a short arm region of up to 222 kb on chromosome 3 from Maratelli was introgressed, and only the qLTG3-1 gene exhibited polymorphisms within the coding region compared to Akitakomachi. The qLTG3-1 genotype was significantly associated with brown rice quality in the F2 population, which indicates that the qLTG3-1 gene was involved in this trait with no involvement of other chromosomal regions of Akikei770. The functional qLTG3-1 allele in Akikei770, encoding a hybrid glycine-rich protein (HyGRP) that is localized on the cell wall or membrane, enhanced the low-temperature germinability. Because a loss-of-function allele of qLTG3-1 increased the appearance quality of brown rice in a recessive manner, it was concluded that HyGRP, which enhances low-temperature germinability, has a pleiotropic effect that reduces the appearance quality of brown rice.

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水稻 qLTG3-1 等位基因的多效应:提高低温发芽率的同时降低糙米外观品质
水稻质量对其经济价值有重大影响,因此必须培育优质谷物品种。此外,直接播种还需要发芽率和低温生长性能优越的品种,这样才能实现大米的低成本生产。我们从优质、口感好的栽培品种 Akitakomachi 培育出了 Akikei770,这是一个近等基因品系,携带来自 Maratelli 栽培品种的 qLTG3-1 基因,该基因可提高低温发芽性。虽然 Akikei770 的低温发芽率有所提高,但在糙米的外观质量和熟米的食用质量方面却不如 Akitakomachi。在 Akikei770 中,从 Maratelli 引入了 3 号染色体上长达 222 kb 的短臂区,与 Akitakomachi 相比,只有 qLTG3-1 基因在编码区内表现出多态性。在 F2 群体中,qLTG3-1 基因型与糙米品质显著相关,这表明 qLTG3-1 基因参与了该性状的形成,而秋池 770 的其他染色体区域并未参与。Akikei770 中的 qLTG3-1 功能等位基因编码一种富含杂交甘氨酸的蛋白(HyGRP),该蛋白定位于细胞壁或细胞膜上,可提高低温发芽率。由于 qLTG3-1 的功能缺失等位基因以隐性方式增加了糙米的外观品质,因此得出结论:HyGRP 可提高低温发芽率,具有降低糙米外观品质的多效应。
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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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