【作者】 林丽秀；

【导师】 白史且； 张新全；

【作者基本信息】 四川农业大学 ， 草业科学， 2008， 硕士

【摘要】 本试验通过对54个紫花苜蓿品种形态学特性、生产性能、饲草营养价值、耐热性等相关指标的测定研究,并运用了三种方法进行了综合评价,试验结果如下:1.不同紫花苜蓿品种的形态学指标与产量的相关性比较,对产量极显著相关的形态学指标有主枝侧枝数、单株分枝数、茎粗、株高,并用这4个指标对54个苜蓿品种进行欧氏平方距离法聚类,综合评判形态学表现,结果将54个品种聚为4大类,BL-05-47单独为一类,其特征为主枝侧枝数、单株分枝数多,茎杆粗大,植株高大;BL-05-51和BL-05-53聚为一类,形态学特征综合表现最差;其余品种表现一般。2.54个紫花苜蓿品种的生产性能差异明显,品种BL-05-35、BL-05-32、BL-05-33、BL-05-11、BL-05-22、BL-05-9、BL-05-18、BL-05-23和BL-05-34的产量高,植株高、分枝多、营养品质好,可作为以后试验工作中的重点研究对象;BL-05-25、BL-05-14、BL-05-40、BL-05-19产量较高,但茎叶比较高,粗蛋白含量较低,影响其品质;BL-05-52产量较高,但植株低矮;品种BL-05-20、BL-05-21、BL-05-29、BL-05-13、BL-05-46、BL-05-45、BL-05-44和BL-05-43产量低,植株低矮,分枝少,营养品质较差,适应性最差;其他品种各项指标表现一般。3.应用灰色系统理论对54个品种的生产性能进行综合评价,根据加权关联度值大小评价苜蓿各品种生产性能的优劣。加权关联度越大则生产性能综合表现越好,根据其排序,品种编号BL-05-35、BL-05-32、BL-05-33、BL-05-09和BL-05-11表现出较好的生产性能,可为以后的种植筛选研究工作提供一定的指导意义;排序最后10名的品种包括:BL-05-54、BL-05-21、BL-05-20、BL-05-10、BL-05-45、BL-05-BL-05-46、BL-05-13、BL-05-30、BL-05-43和BL-05-44,这些品种生产性能综合表现差,不适宜在当地引种培育;其他品种综合表现一般。4.通过对8份不同秋眠型苜蓿材料的耐热性比较,其中秋眠级为1的品种2份,秋眠级为5的品种3份,秋眠级为9的品种3份,根据品种耐热指标相对电导率、丙二醛含量和过氧化物酶活力的隶属函数值大小来评判8份苜蓿材料的耐热性,试验结果为:耐热性由大到小的顺序为:BL-05-25(FD9)＞BL-05-12(FD5)＞BL-05-44(FD1)＞BL-05-36(FD 5)＞BL-05-49(FD 1)＞BL-05-40(FD 9)＞BL-05-41(FD 5)＞BL-05-31(9)。结果表明,苜蓿耐热性与其秋眠级没有必然联系。更多还原

【Abstract】 In this paper,the adaptability of 54 alfalfa varieties were studied on the morphological characteristics,production performance,forage nutrition and heat-tolerance, And three methods were used to evaluated their comprehensive performance.The results showed as follows:1.The result of relevant comparison between morphological characteristics and yield showed that lateral branch number of main branch,tiller number per plant,stem diameter and plant height were significantly correlated with yield of alfalfa.The 54 cultivars were clustered into 4 groups by unweighted pairwise groups method using arithmetic average (UPGMA) based on the 4 morphological indexes.Result of cluster analysis indicated that the cultivars that cluster 1 was BL-05-47 which was much better as far as the 4 botanical characteristics were concerned,and the BL-05-51 and BL-05-53 were the worst.The other cultivars were the medium.2.The production performance was different among 54 different alfalfa varieties.The varietiesBL-05-35,BL-05-32,BL-05-33,BL-05-11,BL-05-22,BL-05-09,BL-05-18,BL-05-2 3and BL-05-34 had high yield,high plant,many branches and nutrient quality was better, so these cultivars can be chosen as the key study object for the future work.Although the varieties BL-05- 25,BL-05-14,BL-05-40 and BL-05-19 also had higher yields,its high stem-leaf ration and lower crud protein content caused their quality decreased;The varieties BL-05-52 had high yield but the height of plant was low,Varieties of BL-05-20, BL-05-21,BL-05-29,BL-05-13,BL-05-46,BL-05- 45,BL-05- 44 and BL-05- 43 showed the poor adaptability for these varieties had the lowest yield,lower height-plant,few branching and worse quality,and the other varieties had the medium production performance.3.The production performance of 54 alfalfa cultivars was comprehensive evaluated based on the gray systemic theory.Alfalfa’s production performance was associated to the relational coefficients.The relation coefficients is higher,the production performance of alfalfa is better.A According to the relational coefficients sorting,the varieties of BL-05-35, BL-05-32,BL-05-33,BL-05-09 and BL-05-11 showed the better production performance. And the last ten were the varieties of BL-05-54,BL-05-21,BL-05-20,BL-05-10, BL-05-45,BL-05-46,BL-05-13,BL-05-30,BL-05-43 and BL-05-44,which had worse production performance and not suited to been introduced in this area.4.In this experiment the heat-tolerance of eight alfalfa cultivars of different types fall dormancy,including two types of FD-1,three types of FD-5 and three types of FD-9,were studied also.The relative conductivity,MDA content and peroxidase activity were chosen to evaluated the heat-tolerance of the eight alfalfa varieties.The results showed as:the order of heat-tolerance of the eight alfalfa cultivars was BL-05-25(FD-9)＞BL-05-12(FD-5)＞BL-05-44(FD-1)＞BL-05-36(FD-5)＞BL-05-49(FD-1)＞BL-05-40(FD-9)＞BL-05-41(FD-5)＞BL-05-31(FD-9).This result indicated that there were no positive connection with the the heat-tolerance of alfalfa between its fall dormancy.更多还原