شناسایی و انتخاب ژنوتیپ های مقاوم به سرما یونجه های یکساله

Alfalfa has been called the queen of fodder plants. The tolerance to unfavorable environmental conditions of annual medics, considered them as a replacement for alfalfa. This piece of work performed with two aims: 1- identification and cold tolerance degrees of annual medic, and 2- introducing the suitable spices and accession of annual medics for different conditions of Iran, especially cold climate of the country. A number of 34 accessions of 6 species of annual medics planted on 6 farm of 6 regions at 3 altitude, 1300, 1450 and 2000 meters, above sea levels on Alborz and Zacros range mountains as the effective factors on temperature, in a randomize bloke design. Only plants on two altitudes, 1300 and 1500 meters above sea levels on Alborz range mountains were considered. The effect of temperature considered on 9 accessions of 5 species of annual medics in lab condition, too. The different attribute of the annual medic genotypes showed different reaction to temperature. Although M. radiate is present on the highest altitude on nature of Iran, but because of many reasons, the M. rigidula is a promising species for Iran. So, it is recommended to collect different accessions of the M. rigidula species and carrying out experiment under chilling and freezing temperatures. However, the other species are very important because of their special charecters.