A carregar...
Publicação
Assessing visualized response phenomena of grapevine rootstocks exposed to lime and drought stress
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 2.55 MB | Adobe PDF |
Autores
Orientador(es)
Resumo(s)
Iron-deficiency induced chlorosis and drought stress are major constraints in viticulture influencing
grape yield and quality. Notably when occurring simultaneously, these stresses can have intense
negative effects on plant physiology and plant nutrition. Grapevine rootstocks have the capacity to adapt
to different abiotic stresses by morphological, biochemical or gene expression changes, but the mechanisms
in detail are not well studied.
It can be assumed, that root differentiation has a functional key role in rootstocks adaptation to
abiotic stresses. Therefore, the current study aims to characterize the Casparian strip formation and the
suberization of endodermis and exodermis to conclude on the plasticity in nutrient and water uptake of
grapevine rootstocks. In in-vitro approaches Fercal and 3309 C were subjected to iron free growth conditions
and osmolyte induced drought stress as well as the combined stress. Furthermore, rootstock
cuttings were grown in rhizoboxes to evaluate the root system architecture.
For the intra-treatment comparison, significant differences in root pattern distribution and length
parameters were found. For the rootstocks compared, intensified main root length growth seemed not
to be a mitigative strategy. In contrast, Fercal had significantly fewer and shorter lateral roots than
3309 C. This implies, Fercal is more efficient per unit root surface. i.e. by increasing the area of the root
hair zone.
A systematic lignification and suberization can incrementally be observed with increasing stress
intensity. For 3309 C, the rhizobox experiments also showed intra-treatment effects. For iron deficiency,
foraging seemed to be the main strategy.
The results confirmed a high variability between rootstocks supposing specific adaptations strategies
to no-iron and drought stress conditions on the root system development as well as on the root
molecular differentiation process. The established in-vitro based method could provide a tool to test
different environment versus genotype interactions of grapevine rootstocks
Descrição
Vinifera EuroMaster - European Master in Viticulture and Oenology Engineering / Instituto Superior de Agronomia. Universidade de Lisboa / University of Natural Resources and Life Sciences, Vienna
Palavras-chave
Casparian strips suberin root system architecture abiotic stress phenetics
Contexto Educativo
Citação
Schulitz, S.P. - Assessing visualized response phenomena of grapevine rootstocks exposed to lime and drought stress. Lisboa: ISA, 2021, 98 p.