scholarly journals Increasing insight into induced plant defense mechanisms using elicitors and inhibitors

2010 ◽  
Vol 5 (3) ◽  
pp. 271-274 ◽  
Author(s):  
Maaike Bruinsma ◽  
Joop J.A. van Loon ◽  
Marcel Dicke
2021 ◽  
Author(s):  
Saif ul Malook ◽  
Xiao-Feng Liu ◽  
Wende Liu ◽  
Jinfeng Qi ◽  
Shaoqun Zhou

Fall armyworm (Spodoptera frugiperda) is an invasive lepidopteran pest with strong feeding preference towards maize (Zea mays). Its success on maize is facilitated by a suite of specialized detoxification and manipulation mechanisms that curtail host plant defense responses. In this study, we identified a Chinese maize inbred line Xi502 that was able to mount effective defense in response to fall armyworm attack. Comparative transcriptomics analyses, phytohormonal measurements, and targeted benzoxazinoid quantification consistently demonstrate significant inducible defense responses in Xi502, but not in the susceptible reference inbred line B73. In 24 hours, fall armyworm larvae feeding on B73 showed accelerated maturation-oriented transcriptomic responses and more changes in detoxification gene expression compared to their Xi502-fed sibling. Interestingly, oral secretions collected from larvae fed on B73 and Xi502 leaves demonstrated distinct elicitation activity when applied on either host genotypes, suggesting that variation in both insect oral secretion composition and host plant alleles could influence plant defense response. These results revealed host plant adaptation towards counter-defense mechanisms in a specialist insect herbivore, adding yet another layer to the evolutionary arms race between maize and fall armyworm. This could facilitate future investigation into the molecular mechanisms in this globally important crop-pest interaction system.


2012 ◽  
pp. 26-44
Author(s):  
Suprana Biswas ◽  
Nabanita Chakraborty ◽  
Supriya Chakraborty

Flavoring compounds of plants play a significant role in plant defense mechanism. Compound responsible for strong sour tamarind flavor has been isolated and identified from Methanol fraction of tamarind leaves (TrMF). Chromatographic and spectral analyses of TrMF revealed the compound to be methyl 2,3,4- trihydroxyhexanoate. This compound showed a strong antioxidant activity as well as strong antimicrobial activity. It showed significant antioxidant activity with Ic50 value of 2.5μg/ml whereas tert-butyl-1-hydroxytoluene and ascorbic acid revealed 26.0μg/ml and 5.0μg/ml, respectively. It also revealed strong inhibitory activity against Aspergellosis disease-causing fungi namely; Aspergillus fumigatus, Aspergillus tamarii and Aspergillus niger at all concentrations. Streptococcus aureus and Escherichia coli were much more sensitive to methyl-trihydroxy-hexanoate at all concentrations than Pseudomonas aeruginosa. This pure compound exhibited concentration dependent inhibitory and stimulatory activity on rice seeds germination and seedling growth. It showed strong inhibitory activity up to 62.5ppm concentration and below this concentration the effect was stimulatory. Methyl- trihydroxyhexanoate exhibited wide range of defensive activity against microbes and crop seeds and also possesses potent antioxidative activity. Thus play an important role in plant defense mechanism and can be utilized as a valuable source of bio-herbicides and pesticides.


2020 ◽  
Vol 76 (9) ◽  
pp. 3273-3281
Author(s):  
Yu‐Xi Zhu ◽  
Zhang‐Rong Song ◽  
Yue‐Ling Song ◽  
Xiao‐Yue Hong

1994 ◽  
Vol 6 (2) ◽  
pp. 285-304 ◽  
Author(s):  
Anne McKeough ◽  
Tim Yates ◽  
Anthony Marini

AbstractThe purpose of this work was to investigate the way in which boys, ages 6, 8, and 10 years, who are behaviorally disturbed, understand motives behind human behavior, compared to normally functioning peers. Four tasks were administered that differed in surface features but that shared an underlying conceptual structure. A structural analysis of response protocols was undertaken to assess the level of cognitive complexity of their productions. Age-appropriate performance required varying degrees of intentional understanding (i.e., the reciprocal causal relations between action and mental states such as feelings and desires). The results of this analysis supported our predictions that behaviorally disturbed children use developmentally naive reasoning in the domain of conflict resolution, compared with their normal peers. Additionally, a thematic analysis of the content of responses was performed. The results of this analysis showed that the two groups' reasoning also differed qualitatively, in that the aggressive boys showed greater evidence of socially maladaptive thought, whereas the comparison group's performance was largely adaptive. We propose that early-formed primitive defense mechanisms may interfere with the aggressive group's construction of prosocial mental models of the social world. The results suggest that this line of research, which integrates developmental and psychoanalytic theory, has the potential to offer insight into the mechanisms underlying behavioral aggression.


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