Track 1-01

Description

Lotus tenuis L. is a perennial forage species of European origin. It is found in Chile in a wide range of environments between the Valparaíso (32°S) and Bíobío Regions (38°S), with a strong presence in areas with clay and volcanic soils of medium texture with problems of moisture retention. The Instituto de Investigaciones Agropecuarias (INIA) perennial forage legume breeding program has focused on developing drought-tolerant cultivars of the species. A population of 100 individuals was selected in previous studies, and all individuals were agronomically and physiologically characterized under field and greenhouse conditions. Results led to the selection of a sub-population of 14 individuals composed of drought-sensitive (7) and drought-tolerant (7) genotypes. The objective of this study was to interpret drought tolerance/sensitivity of the sub-population by analyzing plant physiological response under field drought conditions.

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Physiological Response of 14 Lotus tenuis Genotypes Subjected to Drought Conditions

Lotus tenuis L. is a perennial forage species of European origin. It is found in Chile in a wide range of environments between the Valparaíso (32°S) and Bíobío Regions (38°S), with a strong presence in areas with clay and volcanic soils of medium texture with problems of moisture retention. The Instituto de Investigaciones Agropecuarias (INIA) perennial forage legume breeding program has focused on developing drought-tolerant cultivars of the species. A population of 100 individuals was selected in previous studies, and all individuals were agronomically and physiologically characterized under field and greenhouse conditions. Results led to the selection of a sub-population of 14 individuals composed of drought-sensitive (7) and drought-tolerant (7) genotypes. The objective of this study was to interpret drought tolerance/sensitivity of the sub-population by analyzing plant physiological response under field drought conditions.