Genetic variation and heritability for germination, seed vigour and field emergence in brown and yellow-seeded genotypes of flax
Genetic variation and heritability for germination, seed vigour and field emergence in brown and yellow-seeded genotypes of flax
复制标题
亚麻棕色和黄色种子基因型的发芽、种子活力和田间出苗的遗传变异和遗传力
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发表时间：
2012
期刊：
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通讯作者：
G. Saeidi
中科院分区：
文献类型：
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作者：
G. Saeidi
种子活力的遗传改良和黄籽亚麻 (Linum usitatissimum L.) 的出苗对于良好的林分建立非常重要，因为它们会受到黄籽颜色的负面影响。本研究旨在调查遗传变异、广义遗传力以及对发芽、种子活力和田间出苗选择的预期遗传反应。 2005年和2006年，对黄籽亚麻的16个基因型和棕籽亚麻的17个基因型进行了5°C、15°C发芽和活力测试（冷试验）以及田间出苗的评估。黄籽亚麻的活力测试和田间出苗的遗传变异远高于棕籽，其遗传变异系数为41%，活力变异系数为17.9%。经检验，2005 年和 2006 年田间出苗率分别为 50.9% 和 3.8% 和 34.1% 和 18%。活力测试中黄色和棕色种子基因型的发芽率分别为10.7%至55.3%和40.7%至88.7%。 2005年和2006年，黄籽基因型的田间出苗量为20～217.3株/m 2 和35～184.3株/m 2 。然而，棕色种子基因型的相应范围是266至414和93.7至210株幼苗/m 2 。 5°C 发芽和活力测试、50% 出苗天数和种子重量的广义遗传力较高（65.9 至 98.4%）。 2005年和2006年，棕色种子的田间出苗遗传力为低到中等（6.7%和51.6%），黄色种子为中到高（56.2%到96.8%）。在黄色种子基因型中发现了对种子活力和田间出苗选择的遗传反应的高估计，表明这些性状遗传改良的可能性。
Genetic improvement of seed vigour and emergence of yellow-seeded flax (Linum usitatissimum L.) is important to have a good stand establishment, since they are negatively affected by yellow seed colour. This study was conducted to investigate genetic variation, broad-sense heritability and expected genetic response to selection for germination, seed vigour and field emergence. Sixteen genotypes of yellow-seeded flax and 17 of brown-seeded were evaluated for germination at 5°C, 15°C and vigour test (cold test) and also for field emergence in 2005 and 2006. Genetic variation for vigour test and field emergence in yellow-seeded genotypes was much higher than brown-seeded, as shown by their genetic coefficients of variation of 41% vs. 17.9% in vigour test, 50.9% vs. 3.8% and 34.1% vs. 18% for field emergence in 2005 and 2006, respectively. Germination of yellow and brown-seeded genotypes in vigour test varied from 10.7 to 55.3% and 40.7 to 88.7%, respectively. Field emergence ranged from 20 to 217.3 and 35 to 184.3 seedlings/m 2 among yellow-seeded genotypes in 2005 and 2006; however, the corresponding range for brown-seeded genotypes was 266 to 414 and 93.7 to 210 seedlings/m 2 . Broad-sense heritability for germination at 5°C and vigour test, days to 50% emergence and seed weight were high (65.9 to 98.4%). The heritabilities for field emergence were low to moderate for brown seeds (6.7% and 51.6%), and moderate to high (56.2 % to 96.8%) for yellow seeds in 2005 and 2006. High estimates of genetic response to selection for seed vigour and field emergence were found in yellow-seeded genotypes, indicating the possibility of genetic improvement of these traits.