Abstract
ABSTRACTAnnual medics are feed legumes that can be used as a cover crop or green manure. Species such as Medicago scutellata are sensitive to cold stress. To identify cold-tolerant germplasm, 351 accessions of Iranian annual medics, belonging to 13 species, were evaluated. Growth rate was scored for each accession from autumn to spring. Based on first-year results, M. coronata, M. laciniata, M. littoralis, M. turbinata, and M. scutellata were identified as cold-sensitive species, whereas four species [M. minima (5 accessions), M. noeana (2 accessions), M. rigiduloides (4 accessions), and M. rigidula (5 accessions)] were found to be cold-tolerant and tested further using a randomized complete-block design with three replications. Significant differences (p < 0.01) among accessions for agronomic traits (forage-, seed-, and pod-yield; percentage of green cover) were detected. M. rigiduloides, M. rigidula, M. minima, and M. noeana were cold-tolerant in descending order. Such cold-tolerant accessions can be used in breeding programs to develop cold-tolerant varieties.
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