QTL analysis of regrowth ability in bmr sorghum (Sorghum bicolor [L.] Moench) × sudangrass (S. bicolor subsp. drummondii) populations

IF 1.1 4区农林科学 Q3 AGRICULTURE, MULTIDISCIPLINARY

Grassland Science Pub Date : 2022-04-21 DOI:10.1111/grs.12365

Jun-ichi Yonemaru, Shigemitsu Kasuga, Hiroyuki Kawahigashi

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Abstract

Sorghum (Sorghum bicolor [L.] Moench) is an important annual forage crop. Multiple harvests per year not only increase the total yield of sorghum but also help to avoid its injury and damage by biotic and abiotic stresses. It is well known that S. bicolor subsp. drummondii, or sudangrass, regrows vigorously after cutting. To elucidate the genetic mechanisms underlying this ability, we evaluated recombinant inbred lines and advanced populations of bmr (brown midrib) sorghum × sudangrass under different environments and identified quantitative trait loci (QTLs) controlling regrowth ability. Although the dry matter weight at the second harvest varied among years, significant QTLs for increased regrowth ability were detected on chromosomes (Chrs.) 3, 6, 7 and 10. In particular, the sudangrass alleles of two QTLs detected on Chrs. 7 and 10 showed a positive effect on regrowth ability. We named the QTL on the short arm of Chr. 7 qRG7-1 and verified it in the QTL analysis of F₃ and BC₂F₃ populations. QTL analysis by using an F₃ population segregating for regrowth ability also showed a clear LOD peak in the qRG7-1 region. Substitution mapping using two BC₂F₃ populations placed qRG7-1 at 3.81–9.75 Mb on Chr. 7.

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高粱(sorghum bicolor)再生能力的QTL分析。黄花草(S.双色亚种)drummondii)人口

高粱(高粱双色);是一种重要的一年生饲料作物。一年多次收获不仅能提高高粱的总产量，而且有助于避免其受到生物和非生物胁迫的伤害和破坏。众所周知，双色葡萄球菌亚种。Drummondii，或苏丹草，修剪后再生旺盛。为了阐明这种能力的遗传机制，我们在不同环境下对高粱×苏丹草重组自交系和高级群体进行了评价，并鉴定了控制再生能力的数量性状位点(qtl)。第二季干物质质量在不同年份有所不同，但在第3、6、7和10号染色体上检测到显著的再生能力增强qtl。其中，7号和10号基因上检测到的两个qtl的苏丹草等位基因对再生能力有正向影响。我们将Chr. 7短臂上的QTL命名为qRG7-1，并在F3和BC2F3群体的QTL分析中进行验证。利用F3群体分离进行的QTL分析也显示，qRG7-1区域存在明显的LOD峰值。使用两个BC2F3种群进行替换映射，qRG7-1在Chr 7上的位置为3.81 ~ 9.75 Mb。

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来源期刊

Grassland Science Agricultural and Biological Sciences-Agronomy and Crop Science

CiteScore

2.70

自引率

7.70%

发文量

审稿时长

>12 weeks

期刊介绍： Grassland Science is the official English language journal of the Japanese Society of Grassland Science. It publishes original research papers, review articles and short reports in all aspects of grassland science, with an aim of presenting and sharing knowledge, ideas and philosophies on better management and use of grasslands, forage crops and turf plants for both agricultural and non-agricultural purposes across the world. Contributions from anyone, non-members as well as members, are welcome in any of the following fields: grassland environment, landscape, ecology and systems analysis; pasture and lawn establishment, management and cultivation; grassland utilization, animal management, behavior, nutrition and production; forage conservation, processing, storage, utilization and nutritive value; physiology, morphology, pathology and entomology of plants; breeding and genetics; physicochemical property of soil, soil animals and microorganisms and plant nutrition; economics in grassland systems.