Martín Flores-Saavedra, Pietro Gramazio, Santiago Vilanova, Diana M. Mircea, Mario X. Ruiz-González, Óscar Vicente, Jaime Prohens, Mariola Plazas
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Introgressed eggplant lines with the wild Solanum incanum evaluated under drought stress conditions1
As access to irrigation water becomes increasingly limited, introgression of relevant genomic regions from drought-tolerant wild genotypes is a promising breeding strategy for crop plants. In this study, nine eggplant () introgression lines (ILs) covering altogether 71.6% of the genome of the donor wild relative parent were evaluated for drought tolerance under water stress conditions. Plants at the five true leaves stage were irrigated at either 100% (control) or 30% (water stress) field capacity for 14 days, and growth and biochemical traits were measured. Reduced irrigation resulted in decreased growth and increased levels of stress markers such as proline and malondialdehyde. Most ILs had lower growth and biomass production than the cultivated parent under both conditions. However, the wild alleles for two genomic regions related to stem and root dry weight ( and ) conferred improved tolerance to water stress. In addition, several alleles had a positive effect on important traits that may improve yield under drought conditions, such as leaf water content (), water use efficiency () and chlorophyll content ( and ). Fine-mapping of the genomic regions for tolerance and reducing linkage drag with regions affecting growth will be crucial for significantly improving eggplant drought tolerance through introgression breeding.
期刊介绍:
Journal of Integrative Agriculture publishes manuscripts in the categories of Commentary, Review, Research Article, Letter and Short Communication, focusing on the core subjects: Crop Genetics & Breeding, Germplasm Resources, Physiology, Biochemistry, Cultivation, Tillage, Plant Protection, Animal Science, Veterinary Science, Soil and Fertilization, Irrigation, Plant Nutrition, Agro-Environment & Ecology, Bio-material and Bio-energy, Food Science, Agricultural Economics and Management, Agricultural Information Science.