ChileanJAR

On the purpose of improving chilean bean varieties of Cristal Bayo (for snap or fresh consume), Tórtola and Cristal Blanco (for dry consume, home consumption and exportation, respeetively), susceptible to "Common Bean Mosaic" (Phaseolus virus l), and its strain N.Y. 15, crosses between these varieties and foreign parents with improving virus resistance were made, (Corbett inmunity).
This researeh was carried out in the greenhouse, laboratories and field at La Platina Experimental Station of the Instituto de Investigaciones Agropeeuarias.
The hybridization were made thru the method informed by Oliver for legumes. Starting from F₂, the material was artificialIy inoculated with common bean mosaie virus by the rubbing method. The inmunity of R₁ R₂ and R₃ plants (back-crosses) was tested by reaetion to virus by hipersensibility, which permits detecting the plants with eonferred inmunity by dominant gen es, type Corbett.
Field selection of resistant material, employing the pedigree method was made thru various segregating generations, considering: virus resistanee, pod and seed size, preeocity, appearance,and p]ant vigor, etc.
The best lines were tested in preliminar yield trials and later on in rnain trials during several periods and in different localities.
Lines with better behaviour and eharacteristics in Cristal Bayo, Tórtola and Cristal iBlaneo varieties, were selected for its multiplication. Apolo (line 21-1525), Tórtola-Diana (line 882-B-1041) and Cristal Blanco-Fenix (line 1137), were superior in yiel, preeocityand virus resistance to their resp ective check varieties.
These varieties, inmunes to virus, which were handed by the Genetical Improvement Program conducted at La Platina Experimental Station, were the first ones obtained by hybridization, and can be cortified under the international patterns which are requested for bean.
Apolo and Tórtola-Diana varieties, have