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Registration of CAD Birdsfoot Trefoil Germplasm Selected for Drought Resistance
Author(s) -
Beuselinck P. R.,
Steiner J. J.
Publication year - 1994
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1994.0011183x003400020057x
Subject(s) - germplasm , trefoil , forage , biology , crop , citation , library science , horticulture , agronomy , computer science
CAD birdsfoot trefoil (Lotus comiculatus L.) germplasm (Reg. no. GP-123, P1 570669) was released by the USDA-ARS in cooperation with the Missouri Agricultural Experiment Station in June 1993. This birdsfoot trefoil germplasm provides plant breeders and researchers with a drought-resistant population for further evaluation and selection. CAD was developed from the genetically diverse MU-81 germplasm. A 2200 plant nursery of MU-81 was established at Fresno, CA, in January 1985 and evaluated for incidence and severity of rootand crown-rot disease complex, which includes, but is not limited to Fusarium spp., Rhizoctonia solani Kiihn, and Mycoleptodiscus terrestris (J.W. Gerdemann) Ostazeski. During the summers of 1985 and 1986, the nursery was subjected to prolonged periods without supplemental irrigation and high daytime temperatures. Daytime temperatures ranged from 14 to 36 °C, and no significant precipitation occurred during these periods. Ninety-nine plants, selected for low incidence of the disease complex in February 1987, were vegetatively propagated, then open-pollinated in isolation at Rosemount, MN, in cooperation with the Regional Technical Committee NC-83. Equal numbers of seed from each plant constituted the Cl cycle. A 1000-plant space-planted nursery of Cl was established in fall 1987 at Fresno. The nursery received normal management until all water was withheld from 12 Aug. to 17 Oct. 1988. Each plant was scored on 27 Nov. 1988 for survival, growth habit, degree of flowering, leafiness, and vigor. Using grid selection, 58 plants (8.25% of the population) were selected from the best-performing survivors based on best combined score for traits evaluated. The selected clones also exhibited a low incidence of rootand crown-rot disease complex. The selections were vegetatively propagated, then open-pollinated in isolation at Rosemount, MN. The C2 cycle was comprised of equal numbers of seed from each plant. Seed from the C2 population was increased in isolated open-pollinated nurseries and was bulked to constitute the CAD germplasm. CAD has been used in field and greenhouse studies and has performed well in adverse drought, salinity, boron, and selenium conditions (1,2). A limited amount of seed will be provided by the corresponding author upon written request and while supplies last. Recipients of seed are requested to recognize its source as a matter of open record when this germplasm contributes to the development of a new germplasm or cultivar. Seed may be requested from the corresponding author.