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首页> 外文期刊>Australian Journal of Crop Science >Characterization of nine alfalfa varieties for differences in ovule numbers and ovule sterility
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Characterization of nine alfalfa varieties for differences in ovule numbers and ovule sterility

机译：表征9个苜蓿品种的胚珠数和胚珠无菌性差异

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Alfalfa (Medicago sativa L.) is one of the most important forage species worldwide. In order to discover the mechanism of low seed production, two cytological experiments were carried out to investigate ovule numbers per floret and ovule fertility among nine different alfalfa varieties. Results showed that there was significant difference in ovule numbers per floret among the nine alfalfa varieties (P<0.05), and the number of ovules per floret ranged from 7 to 13. The highest ovule number was Huangyangzhen while the lowest one was Ladak. Results also showed that there was significant difference in ovule fertility among different alfalfa varieties (P<0.05), and the average percentage of ovule sterility was 34.90%. The highest percentage of ovule sterility was observed in Russia with 49.07%, while the lowest percentage sterility was 25.20% in Zhungeer. Alfalfa seed set under artificial-pollination showed a significantly linear correlation with ovules per floret (P<0.05) but no significant correlation under self-pollination treatments. The results showed that the fertile ovules per pistil accounted for 51-75% with total ovules per pistil, but the percentages of actual seed yields with potential seed yields of the nine varieties were only 2.49-6.06%, which suggested that ovule sterility maybe just one of the limiting factors for alfalfa seed production. Our results indicated that female fertility of alfalfa was remained in the nature reproductive ability, which was probably due to the breeding selection program of alfalfa that was mainly focused on yield or quality, but seldom on seed production.
机译：苜蓿（苜蓿（Medicago sativa L.））是世界上最重要的牧草之一。为了发现种子产量低的机理，进行了两个细胞学实验，调查了9个不同苜蓿品种的每小花胚珠数和胚珠育性。结果表明，在9个苜蓿品种中，每小花胚珠数存在显着差异（P <0.05），每小花胚珠数为7至13。最高胚珠数为黄羊珍，最低胚珠为Ladak。结果还表明，不同苜蓿品种的胚珠育性差异显着（P <0.05），平均不育率为34.90％。俄罗斯的胚珠不育率最高，为49.07％，而准格尔的不育率最低，为25.20％。人工授粉的紫花苜蓿种子与每个小花的胚珠呈显着线性相关（P <0.05），而自花授粉处理则无显着相关。结果表明：9个品种的可育胚珠/雌蕊占胚珠总数的51-75％，但实际种子产量与潜在种子产量的百分比仅为2.49-6.06％，这表明胚珠不育性可能只是苜蓿种子生产的限制因素之一。我们的研究结果表明，紫花苜蓿的雌性育性仍然保持其自然繁殖能力，这可能是由于紫花苜蓿的选育计划主要侧重于产量或品质，但很少针对种子生产。

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