温度对西藏5种野生豆科牧草种子萌发的影响研究

为探明毛果胡卢巴、劲直黄芪、天蓝苜蓿、镰荚棘豆和窄叶野豌豆5种野生豆科牧草种子萌发的适宜温度以提高其萌发率,研究了0/10℃ 、5/15℃ 、10/20℃ 、15/25℃ 、20/30℃ 、25/35℃ 、30/40℃等7种发芽温度对西藏5种野生豆科牧草种子萌发的影响.结果表明,5种野生豆科牧草种子在0/10℃条件下均无萌发;发芽率、发芽势、发芽指数和活力指数等指标随昼夜温度的升高呈先上升后下降趋势;毛果胡卢巴、劲直黄芪、天蓝苜蓿、镰荚棘豆和窄叶野豌豆牧草在适宜温度范围内种子萌发时滞最短,依次为2,2,2,3,4d;毛果胡卢巴和镰荚棘豆种子萌发最适温度为15/25℃,发芽率分别高达95%和812.5%;劲直黄芪、天蓝苜蓿、窄叶野豌豆种子萌发最适温度为20/30℃,发芽率依次为85%、912.5%和65%.

Effects of Temperature on Seed Germination of 5 Species Wild Legume Forage Grass in Tibet

In order to investigate the Medicago pubescens ,Astragalus strictus ,Medicago lupulina , Oxytropis falcata Bunge ,and Vicia angustifolia of 5 kinds of wild forage grass seed germination suit-able temperature to improve the germination rate ,the test with 0/10 ℃ 、5/15 ℃ ,10/20 ℃ ,15/25 ℃20/30 ℃ ,25/35 ℃ and 30/40 ℃ to study the effects of seven seeds germination temperatures on seed germination of 5 species of wild legume forage grass in Tibet were carried .The results showed that :In 0/10 ℃ ,5 leguminous forage grass seed no germination ;Germination rate ,germination potential ,ger-mination index and vigor index increased with the increase of day and night temperature ,and then decreased;Medicago pubescens ,Astragalus strictus ,Medicago lupulina ,Oxytropis falcata Bunge ,and-Vicia angustifolia in the suitable temperature range ,the seed germination time lag was the shortest , followed by 2d ,2d ,2d ,3d ,4d ,the most suitable temperature of Medicago pubescens and Oxytropis falcata Bunge forage seed is 15/25 ℃ ,which germination rate are 95% and 812.5% ,the most suitable temperature of Astragalus strictus ,Medicago lupulina and Vicia angustifolia forage seed is 20/30 ℃ ,which germination rate are 85% 、91 .25% and 65% .This study the development and utilization of germplasm resources of Tibetan wild legume forage grass provides a theoretical basis .