Completion of the agronomic evaluations of Medicago ruthenica [(L.) Ledebour] germplasm collected in Inner Mongolia
Completion of the agronomic evaluations of Medicago ruthenica [(L.) Ledebour] germplasm collected in Inner Mongolia
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DOI：
10.1023/a:1008730322306
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发表时间：
1999-10-01
影响因子：
2
通讯作者：
Xia, ZL
中科院分区：
文献类型：
--
作者：
Campbell, TA;Bao, G;Xia, ZL
因为紫花苜蓿[(L.)]Ledebour是一种很有潜力的新型饲用豆科植物，我们于1991年在内蒙古采收了90份。本研究评估的40份资料（E2）可追溯到13个采集点，范围从40°40′（北纬）× 111°15′（东经）到42°55′（北纬）× 122°20′（东经），海拔范围从175 ~ 1493 m。与之前评估的50个资料相比，其中19个资料来自通常较温和和干燥气候（温带沙漠草原）的新地点或代表性不足的地点（E1）。在为期两年的研究中，所有材料在马里兰州贝尔茨维尔（美国）缺乏B和K的Iuka砂壤土（粗壤土，硅质，酸，热，水溶；pH 6.4）上进行评估。E1和E2在干物质产量、生长习性、叶形、株高和株宽方面均有显著差异。直立生长习性与叶片窄度呈正相关，卧位与产量呈正相关，但特定的叶片形状或生长习性与冬季耐受性无关。E2中，4个白麻品种和栽培苜蓿（M. sativa L.）对照的叶茎比差异不显著，但白麻对马铃薯叶蝉（Empoasca fabae Harris）取食的耐受性显著高于白麻。第二年紫花苜蓿干物质产量约为白刺草的5倍。许多产量最高的材料是在耕地和/或建筑物附近采集的。尽管两种评价的数据显示了相同的基本趋势，但仍有足够的偏差来强调评价整个种质收集的价值。
Because Medicago ruthenica [(L.) Ledebour] is a potential new forage legume, we collected 90 accessions in Inner Mongolia in 1991. The 40 accessions evaluated in this study (E2) trace to 13 collection sites ranging from 40 degrees 40' (N) x 111 degrees 15' (E) to 42 degrees 55' (N) x 122 degrees 20' (E) and to altitudes ranging from 175 to 1493 m. Nineteen of these accessions were collected from new or under-represented sites in generally milder and drier climates (temperate desert steppes), compared to the 50 accessions evaluated earlier (E1). All accessions were evaluated at Beltsville, MD (USA) on a B and K deficient Iuka sandy loam (coarse-loamy, siliceous, acid, thermic, Aquic Udigluvent; pH 6.4) in two-year studies. Significant variation was noted in E1 and E2 for dry matter yield, growth habit, leaf shape, and plant height and width. Upright growth habit and leaf narrowness, and procumbency and yield were positively correlated in both evaluations, but no particular leaf shape or growth habit was correlated with tolerance to winter conditions. In E2, leaf:stem ratios of four M. ruthenica accessions and a cultivated alfalfa (M. sativa L.) check were not significantly different, but M. ruthenica was significantly more tolerant of potato leafhopper (Empoasca fabae Harris) feeding than was M. sativa. Second-year alfalfa dry matter yield was about five times larger than that of M. ruthenica. Many of the highest yielding accessions were collected near cultivated fields and/or buildings. Although data for both evaluations demonstrated the same basic trends, there were sufficient deviations to emphasize the value of evaluating the entire germplasm collection.