Completion of the agronomic evaluations of Medicago ruthenica [(L.) Ledebour] germplasm collected in Inner Mongolia

文献类型： 外文期刊

第一作者： Campbell, TA

作者： Campbell, TA;Bao, G;Xia, ZL

作者机构：

关键词： alfalfa;exploration;genetic resources;Medicago ruthenica;Medicago sativa

期刊名称：GENETIC RESOURCES AND CROP EVOLUTION （ 影响因子：1.524； 五年影响因子：1.713 ）

ISSN： 0925-9864

年卷期： 1999 年 46 卷 5 期

页码：

收录情况： SCI

摘要： 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.

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