Changes in glucosinolates content in Brassica oleracea modulate disease severity caused by Xanthomonas campestris pv. campestris
| Autor: | Pari Madloo, Marta Francisco, Pilar Soengas, Margarita Lema |
|---|---|
| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Acta Horticulturae. :75-80 |
| ISSN: | 2406-6168 0567-7572 |
| DOI: | 10.17660/actahortic.2018.1202.11 |
| Popis: | The potential of phytochemicals in sustainable disease management is increasing. Brassica crops have bioactive compounds called glucosinolates (GSLs), which in higher quantities may result in plant resistance against biotic stress. Due to the lack of material with the same genetic background there are not conclusive studies on the defensive role of GSLs against phytopathogens in vivo. The interaction between six genotypes of Brassica oleracea (kale) and the pathogenic bacterium Xanthomonas campestris pv. campestris (Xcc) was studied. These genotypes had different GSL content: high and low sinigrin (HSIN, LSIN), glucoiberin (HGIB, LGIB) and glucobrassicin (HGBS, LGBS), which had been obtained by a divergent selection program. During two consecutive experiments carried out in controlled conditions (time 1 and time 2), thirty plants of each genotype were inoculated with Xcc. Lesions area, disease severity and concentration of GSLs were measured at the end of each experiment. In general, the quantity of GSLs was higher and disease traits were lower in samples from time 2. There was diverse response among high content GSLs genotypes against pathogen. In GBS genotypes, less diseases severity and lower lesion area were observed in HGBS. In GIB selection, there was not significant difference between genotypes for disease severity but the interaction between genotype and time was significant. The individual analysis by time revealed that HGIB had higher disease severity in time 1 than LGIB, whereas in time 2 the relationship was inverted. HSIN and LSIN performed similar in both times and there was not effect on disease development with increased SIN quantity. As conclusion, increasing the amount of GSL in the plant, does not always lead to an increase in the response of the plant to pathogen. There was a clear effect of the indolic GSL (GBS) but not of the aliphatics (SIN, GIB). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|