Gebeyehu Adane, Hammenhag Cecilia, Tesfaye Kassahun, Ortiz Rodomiro, Geleta Mulatu
Department of Plant Breeding, Swedish University of Agricultural Sciences, Alnarp, Sweden.
Bio and Emerging Technology Institute, Addis Ababa, Ethiopia.
Front Nutr. 2024 Dec 13;11:1511098. doi: 10.3389/fnut.2024.1511098. eCollection 2024.
Noug () is an economically important edible oilseed crop in Ethiopia with a large variation in seed set, seed oil content, and fatty acid composition among populations. Although noug is generally strictly self-incompatible (SI), self-compatible (SC) lines were recently developed. This study was conducted to investigate the levels of variation in seed setting and oleic acid content among the self-compatible lines.
The starting materials for the seed setting study were 200 genotypes selected from 100 inbred lines and having, on average, 57 seeds per capitulum, which is higher than that of the SI populations. The SC genotypes were analyzed for their oleic acid content using the half-seed technique.
The analysis of 20 SC lines revealed a high variation in oleic acid content with 70% of the SC lines having 20% or more oleic acid after they were grown under 25°C/21°C day/night temperatures (high-temperature treatment). The oleic acid content increased from 8.2% before to 22.5%, on average, after the high-temperature experiment in the greenhouse. In contrast, the percentage of oleic acid in these lines grown at 21°C/18°C day/night temperatures decreased from 8.2% to 4.4% on average. There was a highly significant positive correlation between oleic acid content and temperature in SC lines.
The study suggests a significant contribution of genotype to the variation in seed setting and environmental factors (mostly temperature) to the oleic acid content. The noug SC-lines showed highly significant variation in seed setting and oleic acid content, which could be used for improving the crop's seed yield and oil quality.
诺格（Noug）是埃塞俄比亚一种具有重要经济价值的食用油籽作物，不同群体间在结实率、种子含油量和脂肪酸组成方面存在很大差异。虽然诺格通常严格自交不亲和（SI），但最近已培育出自交亲和（SC）系。本研究旨在调查自交亲和系之间的结实率和油酸含量的变异水平。
用于结实率研究的起始材料是从100个自交系中选出的200个基因型，每个头状花序平均有57粒种子，高于自交不亲和群体。使用半粒种子技术分析自交亲和基因型的油酸含量。
对20个自交亲和系的分析显示，油酸含量存在很大差异，70%的自交亲和系在25°C/21°C日/夜温度（高温处理）下生长后，油酸含量达到20%或更高。在温室高温试验后，油酸含量平均从之前的8.2%增加到22.5%。相比之下，这些品系在21°C/18°C日/夜温度下生长时，油酸百分比平均从8.2%降至4.4%。自交亲和系中油酸含量与温度之间存在极显著的正相关。
该研究表明基因型对结实率变异有显著贡献，环境因素（主要是温度）对油酸含量有显著贡献。诺格自交亲和系在结实率和油酸含量方面表现出极显著的变异，可用于提高作物的种子产量和油质。
