First Report of Root and Basal Stem Rot in Sacha Inchi (<i>Plukenetia volubilis</i>) Caused by <i>Fusarium oxysporum</i> in China

Chai, Xia; Yang, Zhijian; Fu, Qi; Pan, Bang-Zhen; Tang, Ming‐Chun; Li, C.; Xu, Zeng-Fu

doi:10.1094/pdis-06-17-0784-pdn

Cited by 8 publications

(3 citation statements)

References 5 publications

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“…Currently, the most effective method for confirming pathogenicity, following Koch's postulates, involves the inoculation of live plants with a spore suspension [32]. Stem rot usually occurs under hot and humid weather conditions, as this elevated humidity provides an environment conducive to the formation, germination, and infection of plant tissues by fungal spores.…”

Section: Discussionmentioning

confidence: 99%

Characterization and In Vitro Fungicide Sensitivity of Two Fusarium spp. Associated with Stem Rot of Dragon Fruit in Guizhou, China

Zhao,

Huang

2023

JoF

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Dragon fruit (Hylocereus polyrhizus) constitutes an important economic industry in Guizhou Province, China, and the occurrence of stem rot has become increasingly severe. In this study, we aimed to determine the causative pathogens of stem rot in this region and analyze their sensitivity to fungicides. Twenty-four fungal isolates were obtained from diseased tissues, from which H-4 and H-5 were confirmed as pathogens based on Koch’s postulates. Based on the morphological characteristics of macroconidia, microconidia, and colony morphology, the polygenic phylogenetic tree constructed using internal transcribed spacer, elongation factor 1-alpha, and retinol-binding protein-2 gene fragments, and carbon source metabolism analysis using FF microplates, the two pathogens were identified as F. oxysporum and a newly discovered pathogen, F. concentricum. In addition, the in vitro toxicity of eight fungicides against both pathogens was measured based on the mycelial growth rate. The results showed that trifloxystrobin 25%·tebuconazole 50% (75 WG) exhibited the strongest inhibitory effect against both isolates, with EC50 values of 0.13 µg/mL and 0.14 µg/mL, respectively. These findings hold significant potential for guiding the effective treatment of stem rot in dragon fruit in Guizhou, China.

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Section: Discussionmentioning

confidence: 99%

Characterization and In Vitro Fungicide Sensitivity of Two Fusarium spp. Associated with Stem Rot of Dragon Fruit in Guizhou, China

Zhao,

Huang

2023

JoF

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“…The low selection intensity used in the present study (42%) was viable because the population was small. Future studies should assess other traits, such as unsaturated fatty acid content [7,8,[31][32][33] and disease resistance [34][35][36], that are relevant to the industry and farmers. TNF-total number of fruits per plant; TWF-total weight (g) of fruits per plant; TWS-total weight (g) of seeds per plant; MWF-mean weight (g) of fruits.…”

Section: Selection Gains In Sacha-inchi Progeniesmentioning

confidence: 99%

Indirect Selection for Seed Yield in Sacha-Inchi (Plukenetia volubilis) in Brazil

et al. 2022

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Breeding programs for improvement of sacha-inchi, Plukenetia volubilis L., generally aim to select individuals with greater seed yield since there is a strong correlation between seed yield and oil production. However, the manual removal of seed husks for evaluating this trait is laborious and costly, thereby discouraging breeding efforts. Accordingly, the objective of the present study was to estimate gains from indirect selection of seed production in sacha-inchi progenies, focusing on maximizing efficiency in improvement programs. Genetic parameters along with direct and indirect selection gains were estimated for seed yield traits in 12 open-pollinated progenies. Strong genetic correlations were observed between total number of fruits (TNF), total weight of fruits (TWF), and total weight of seeds (TWS) per plant (r > 0.96). Notably, all three traits demonstrated high heritability (h2 > 0.81). Therefore, plants with high TNF and TWF (Cuzco, Dos de Mayo, Shanao, Aucaloma, and AM-7) can be used to indirectly select the genetic traits of higher seed yields (GS% = 23%). Genetic gain for dry seed production with a selection index of 42% was estimated at 23%, which corresponds to 118 kg.ha−1. Future sacha-inchi improvement programs can select progenies with high TNF and TWF to facilitate the selection of progenies with high TWS.

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“…Additionally, in a nearby Sacha Inchi plantation (<800 m), Chai et al (2018) found that the fungus, F. oxysporum isolate FoPvo1, can cause root rot, growth retardation, wilting and plant death. In our studied plantation, population size of Fusarium in the intercropping system was much lower than that in monoculture, although the species level was not identified due to the current limited technology.…”

Section: Intercropping Shifted Microbial Composition and Structurementioning

confidence: 99%

Intercropping with Chinese leek decreasedMeloidogyne javanicapopulation and shifted microbial community structure in Sacha Inchi plantation

Nie,

Feng,

Cheng

et al. 2021

J. Agric. Sci.

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The root-knot nematode, Meloidogyne javanica, is a major problem for the production of Sacha Inchi plants. We examined the effects of strip intercropping of Sacha Inchi/Chinese leek of 3–4 years on the seasonal dynamics of plant and soil traits in tropical China. Results indicated that in the intercropping system, a partially temporal divergence of belowground resource acquisition via niche separation occurred throughout the growing seasons, besides a complete spatially-separated plant height between the two crops. Compared with Sacha Inchi monoculture, the increased seed yield per unit area in the intercropping system was mainly attributed to the higher plant survival rate, rather than the enhanced plant traits of healthy plants. Intercropping greatly suppressed M. javanica populations only in the wet season, compared with monoculture; which may be associated with the combined effects of the direct allelopathy and indigenous microbe induced-suppressiveness. Intercropping did not affect microbial richness and α-diversity in the rhizosphere, except for the decreased fungal richness. Both bacterial and fungal composition and structure were diverged between monoculture v. intercropping system. The relative abundances of the dominant bacterial genera (Bacillus, Gaiellales, Lactococcus, Massilia and Lysobacter, etc.) differed significantly between the two cropping systems. For fungi, intercropping decreased the relative abundances of Fusarium and Gibberella, but increased those of Nectriaceae_unclassified, Chaetomiaceae, Humicola and Mortierella. Overall, Sacha Inchi/Chinese leek intercropping suppressed M. javanica populations and shifted microbial compositions (especially decreased pathogen-containing Fusarium). The increased yield and economic returns in this intercropping system provide valid information for the effective agricultural management.

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First Report of Root and Basal Stem Rot in Sacha Inchi (Plukenetia volubilis) Caused by Fusarium oxysporum in China

Cited by 8 publications

References 5 publications

Characterization and In Vitro Fungicide Sensitivity of Two Fusarium spp. Associated with Stem Rot of Dragon Fruit in Guizhou, China

Characterization and In Vitro Fungicide Sensitivity of Two Fusarium spp. Associated with Stem Rot of Dragon Fruit in Guizhou, China

Indirect Selection for Seed Yield in Sacha-Inchi (Plukenetia volubilis) in Brazil

Intercropping with Chinese leek decreasedMeloidogyne javanicapopulation and shifted microbial community structure in Sacha Inchi plantation

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