Identification of Quantitative Trait Loci for Alfalfa Forage Biomass Productivity during Drought Stress

Crop Science

E, Lei¹  Kersey, Rossio K.⁴  Han, Yuanhong²  Pierce, Christopher A.¹  Santantonio, Nicholas¹  Ray, Ian M.¹  Bhandari, Hem Singh¹  Monteros, Maria J.²  Sterling, Tracy M.⁵  Meenach, Chris D.¹  Sledge, Mary K.³ 

[1] Dep. of Plant and Environmental Sciences, New Mexico State Univ., Las Cruces, NM 88003$$;Forage Improvement Division, Samuel Roberts Noble Foundation, Ardmore, OK 73401$$;Forage Improvement Division, Samuel Roberts Noble Foundation, Ardmore, OK 73401 Current addresses: Biology Dep., Lipscomb Univ., Nashville, TN 37204$$;Dep. of Plant and Environmental Sciences, New Mexico State Univ., Las Cruces, NM 88003 Current addresses: OpGen Inc., Gaithersburg, MD 20878; H.S. Bhandari, Dep. of Plant Sciences, Univ. of Tennessee, Knoxville, TN 37996$$;Dep. of Entomology, Plant Pathology, and Weed Science, New Mexico State Univ., Las Cruces, NM 88003 Current addresses: Dep. of Land Resources and Environmental Sciences, Montana State Univ., Bozeman, MT 59717$$

关键词: Burgess Shale;    Naraoia;    trilobites;    gills;    exopod;    functional morphology;   

DOI  :  10.2135/cropsci2014.12.0840

学科分类：农业科学（综合）

来源: Crop Science

【 摘 要 】

Large portions of the world’s arable acreage experience water stress on a regular basis. Improving crop productivity in such drought-prone environments is a critical breeding objective. The goal of this study was to detect quantitative trait loci (QTL) associated with alfalfa (Medicago sativa L.) forage productivity during drought stress. Two first-generation backcross (BC1) mapping populations (n = 253) derived from a cross between M. sativa subsp. sativa and M. sativa subsp. falcata were used to develop an updated tetraploid (2n = 4x = 32) genetic linkage map constructed from 600 single-dose allele molecular markers. Map lengths associated with the two populations were 1293 and 1049 cM, with an average marker density of 3.8 and 3.9 cM, respectively. Half-sib families derived from 206 BC1 individuals were evaluated for forage yield in seeded plots in seven water-stressed environments in New Mexico and Oklahoma, USA. Significant genotype effects were detected within each population and environment. Interval mapping analysis identified 10 and 15 QTL that, respectively, improved or reduced forage yield during drought. Average phenotypic effects of each QTL on biomass yield ranged from 3 to 6% and the direction of these effects were generally consistent over environments. Desirable alleles identified in these parents may be suitable for marker-aided introgression into elite populations to incrementally improve their forage productivity in water-limited environments.

【 授权许可】

Unknown