The status of <i>Pseudomonas syringae</i> pv. <i>actinidiae</i> (Psa) in the New Zealand kiwifruit breeding programme in relation to ploidy level

Saei, Amir Ata; Hoeata, K.; Krebs, A; Sutton, Peter; Herrick, J. Arthur; Wood, Milo N.; Gea, L. D.

doi:10.17660/actahortic.2018.1218.40

Cited by 7 publications

(4 citation statements)

References 13 publications

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“…In an eggplant germplasm population, fruit form was positively linked with disease susceptibility to P. capsica [48,50]. Negative associations were found between resistance to the bacterium pathogen Pseudomonas syringae (PV) in Kiwi [60]. When transferring disease resistance into commercial cultivars, it is critical to look for possible correlations, linkage drag, and pleiotropic effects [60].…”

Section: Genetic Diversity and Qtlsmentioning

confidence: 99%

Genetics and Genomics of Capsicum: Valuable Resources for Capsicum Development

Nankolongo¹,

Yllano²,

Arce³

et al. 2023

Capsicum - Current Trends and Perspectives

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Capsicum is a genetically diverse eudicot, diploid, and self-pollinating plant that grows well in slightly warmer environments. This crop is popular in different areas of the world due to its medicinal properties and economic potential. This chapter evaluated and analyzed the Capsicum’s biology and horticultural characteristics, genetic resources, genetic diversity, phylogenetic relationships, ploidy levels, chromosome structures, genome organization, important genes, and their applications. This chapter is indispensable in Capsicum frontier research, breeding, development, management, and utilization of this economically important and highly regarded crop worldwide.

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Section: Genetic Diversity and Qtlsmentioning

confidence: 99%

Genetics and Genomics of Capsicum: Valuable Resources for Capsicum Development

Nankolongo¹,

Yllano²,

Arce³

et al. 2023

Capsicum - Current Trends and Perspectives

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“…In plants, auto-polyploidy confers resistance to pathogenic bacteria, by constitutively activating plant defences (Mehlferber et al 2021;Saei et al 2018) and modelling approaches predict better resistance of polyploids to pathogens and parasites (Oswald and Nuismer 2007). By contrast, synthetic triploid rainbow trout and Atlantic salmon are more susceptible to viruses, bacteria and parasites (Zhou and Gui 2017).…”

Section: Tetraploids Exhibit Similar Resistance To Pathogenic Bacteriamentioning

confidence: 99%

Synthetic autotetraploidCaenorhabditis elegansresist severe cold stress by escaping cold induced death at the gravid adult stage

Chauve

McLysaght

McGarry

et al. 2023

Preprint

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Gene duplications play a major evolutionary role by providing raw material for functional innovation. Whole Genome Duplication (WGD), or polyploidization, is a particular case of duplication encompassing the entire genome and has been implicated in evolutionary diversification. In plants, WGD is recognized as a major evolutionary force, and is linked to speciation and the ability to resist periods of stress and of environmental upheaval. In animals, examples of current polyploid species are rarer, but multiple ancient events are known, including the charismatic two rounds (2R) of WGD that occurred during early vertebrate evolution. The conditions favouring the success of polyploid lineages are unclear. One debated hypothesis states that polyploidy is adaptive in the short-term, however this has never been studied in animals. In this study, we investigated the consequences of polyploidy on physiology and stress resistance in Caenorhabditis elegans, where tetraploidy can be artificially constructed. Our results reveal that although tetraploidy reduces fitness by decreasing fertility and lifespan in regular conditions, tetraploid animals exhibit increased resilience under specific stress conditions related to temperature changes. While neotetraploid animals exhibit similar pathogen resistance, their response to heat stress is altered. They exhibit modest improvement in thermotolerance and prolonged hsp (heat shock protein) mRNA induction upon heat shock (HS) accompanied by altered hsp-16.2 nuclear localization upon HS. Most notably, under severe cold stress, gravid neotetraploids animals massively escape cold-induced death, and generate more progeny than diploid animals. These results suggest a potential adaptive value of tetraploidy under cold stress and might help explain recent correlations found between the frequency of extant animal polyploids and regions experiencing recent glaciation and large temperature variation.

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“…deliciosa cultivars (e.g., Hayward and Jinkui) have shown moderate susceptibility, and A. arguta (including Enza Red and Weiki) and A. rufa cultivars (e.g., Fuchu) were found to be the most tolerant ones [34,44,[72][73][74][75][76][77]. Several studies, including a screening of a large number of orchards in New Zealand, also suggest a higher tolerance to Psa with an increase in plant ploidy level (tetraploidy and hexaploidy > diploidy): (i) tetraploid genotypes (A. arguta, A. chrysantha, A. kolomikta, A. macrosperma, A. polygama, A. tetramera, and A. valvata) had higher tolerance to Psa, and (ii) tetraploid and hexaploid genotypes of A. chinensis had a generally higher tolerance than diploid genotypes of the same species [72,74,76,78]. Additionally, male cultivars of A. chinensis have been pointed out as having a lower tolerance to Psa than female cultivars, showing higher levels of Psa endophytic density [12].…”

Section: Plant Genotypementioning

confidence: 99%

Mitigation of Emergent Bacterial Pathogens Using Pseudomonas syringae pv. actinidiae as a Case Study—From Orchard to Gene and Everything in Between

Silva

Santos

Vasconcelos

et al. 2022

Crops

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Globalization propelled human migration and commercial exchanges at the global level, but woefully led to the introduction of non-indigenous organisms into several agroecological systems. These include pathogenic bacteria with devastating consequences for numerous crops of agronomical importance for food production worldwide. In the last decade, research efforts have focused on these noxious organisms, aiming to understand their evolutionary processes, degree of pathogenicity, and mitigation strategies, which have allowed stakeholders and policymakers to develop evidence-based regulatory norms to improve management practices and minimize production losses. One of these cases is the bacterium Pseudomonas syringae pv. actinidiae (Psa), the causal agent of the kiwifruit bacterial canker, which has been causing drastic production losses and added costs related to orchard management in the kiwifruit industry. Although Psa is presently considered a pandemic pathogen and far from being eradicated, the implementation of strict regulatory norms and the efforts employed by the scientific community allowed the mitigation, to some extent, of its negative impacts through an integrated pest management approach. This included implementing directive guidelines, modifying cultural practices, and searching for sources of plant resistance. However, bacterial pathogens often have high spatial and temporal variability, with new strains constantly arising through mutation, recombination, and gene flow, posing constant pressure to agroecosystems. This review aims to critically appraise the efforts developed to mitigate bacterial pathogens of agronomical impact, from orchard management to genome analysis, using Psa as a case study, which could allow a prompter response against emerging pathogens in agroecosystems worldwide.

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The status of Pseudomonas syringae pv. actinidiae (Psa) in the New Zealand kiwifruit breeding programme in relation to ploidy level

Cited by 7 publications

References 13 publications

Genetics and Genomics of Capsicum: Valuable Resources for Capsicum Development

Genetics and Genomics of Capsicum: Valuable Resources for Capsicum Development

Synthetic autotetraploidCaenorhabditis elegansresist severe cold stress by escaping cold induced death at the gravid adult stage

Mitigation of Emergent Bacterial Pathogens Using Pseudomonas syringae pv. actinidiae as a Case Study—From Orchard to Gene and Everything in Between

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