Potential of Different Actinidia Genotypes as Resistant Rootstocks for Preventing Kiwifruit Vine Decline Syndrome

Abstract

Kiwifruit Vine Decline Syndrome (KVDS) is currently affecting Italian kiwifruit cultivation, causing dramatic yield and economic losses. The syndrome’s aetiology is due to soil-borne pathogens and waterlogging, leading to the decay of roots and then the canopy. Current knowledge about the disease is limited, and the techniques to control the syndrome are ineffective. The use of tolerant rootstocks is one of the most promising tools. Six genotypes of Actinidia were tested for two years at four infected experimental sites in Friuli Venezia Giulia (NE Italy). Plant evaluation and analysis were carried out on the root system and the vegetative parts. At all experimental sites, three genotypes, all belonging to the A. macrosperma group, grew normally. In contrast, plants of A. polygama died earlier and those of A. chinensis var. deliciosa ‘Hayward’ declined during the first year. A. arguta ‘Miss Green’ survived the first year but started to decline during the second year. After two years of study, we were able to identify three putative resistant genotypes: A. macrosperma accession numbers 176 and 183, and ‘Bounty71’, which will be a useful resource as rootstocks or as parents for breeding owing to their potential genetic resistance traits.

Genetic diversity of Actinidia spp. shapes the oomycete pattern associated with Kiwifruit Vine Decline Syndrome (KVDS)

“…1 ). These findings corroborate prior observations made in an open-field environment study 34 . Further details are elucidated in Figure S2 , providing a visual representation of symptom severity.…”

“…Metabarcoding (i.e., targeting a specific genomic barcode conserved among kingdoms) provides a comprehensive picture of the genetic diversity present in a sample 32 , thus, it is a valuable tool for identifying putative causal agents in the context of complex diseases like KVDS 4 , 33 . We have previously reported the potential of different Actinidia species to survive and grow in KVDS promoting soils, since it is of great interest to have different phenotypically resistant genotypes to be used as parents in a rootstock breeding projects 34 . Hence, the main objectives of our work were to assess, describe and compare the structure and composition of the oomycete pattern in root rhizosphere and endosphere of five Actinidia genotypes with different level of resistance to KVDS, applying a metabarcoding approach.…”

Exploring the Influence of Soil Salinity on Microbiota Dynamics in Vitis vinifera cv. “Glera”: Insights into the Rhizosphere, Carposphere, and Yield Outcomes

“…Thick roots were counted for each vine using a 0.1 m high and 0.1 m wide grid system positioned against the profile wall, with the centre grapevine trunk as the reference point. Thick roots were selected due to their high metabolic activity and role as carbohydrate storage sinks [35]. The data are presented as total vine roots per square meter.…”

Grapevine Resistant Cultivars: A Story Review and the Importance on the Related Wine Consumption Inclination

“…Varietal and cultivation innovations have long contributed to agricultural progress towards greater sustainability [25]. An excellent example can be found in the first hybrid resistant varieties, both direct producers and rootstock, the phylloxera crisis [26] and several other species [27]. Therefore, innovation in grapevine cultivars played an essential role in the history of this plant.…”