Cell Wall Degrading Enzymes in<i>Cuscuta reflexa</i>and Its Hosts

Nagar, Ranjana; Singh, M.; Sanwal, G.G.

doi:10.1093/jxb/35.8.1104

Cited by 66 publications

(38 citation statements)

References 15 publications

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“…This, in combination with classical histological and immunocytochemical studies indicating the prominence of cell wall-loosening complexes at the dodder-host plant interface, suggests the importance of cell wall modifications in the induction and penetrance of host tissue by haustoria as well as the rapid expansion of haustorial tissues (Nagar et al, 1984;Vaughn, 2002Vaughn, , 2003. Expansin cell wall modulators were identified as core regulators of parasitism in the root parasites Striga spp.…”

Section: Recruitment Of Genes Relating To Responses To Stimuli and Cementioning

confidence: 73%

De Novo Assembly and Characterization of the Transcriptome of the Parasitic Weed Dodder Identifies Genes Associated with Plant Parasitism

et al. 2014

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Parasitic flowering plants are one of the most destructive agricultural pests and have major impact on crop yields throughout the world. Being dependent on finding a host plant for growth, parasitic plants penetrate their host using specialized organs called haustoria. Haustoria establish vascular connections with the host, which enable the parasite to steal nutrients and water. The underlying molecular and developmental basis of parasitism by plants is largely unknown. In order to investigate the process of parasitism, RNAs from different stages (i.e. seed, seedling, vegetative strand, prehaustoria, haustoria, and flower) were used to de novo assemble and annotate the transcriptome of the obligate plant stem parasite dodder (Cuscuta pentagona). The assembled transcriptome was used to dissect transcriptional dynamics during dodder development and parasitism and identified key gene categories involved in the process of plant parasitism. Host plant infection is accompanied by increased expression of parasite genes underlying transport and transporter categories, response to stress and stimuli, as well as genes encoding enzymes involved in cell wall modifications. By contrast, expression of photosynthetic genes is decreased in the dodder infective stages compared with normal stem. In addition, genes relating to biosynthesis, transport, and response of phytohormones, such as auxin, gibberellins, and strigolactone, were differentially expressed in the dodder infective stages compared with stems and seedlings. This analysis sheds light on the transcriptional changes that accompany plant parasitism and will aid in identifying potential gene targets for use in controlling the infestation of crops by parasitic weeds.

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Section: Recruitment Of Genes Relating To Responses To Stimuli and Cementioning

confidence: 73%

De Novo Assembly and Characterization of the Transcriptome of the Parasitic Weed Dodder Identifies Genes Associated with Plant Parasitism

et al. 2014

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“…Little is known about the influence of nitrogen on the subsequent development of functional haustoria. Indeed, our understanding of the mechanisms involved in establishing vascular continuity within the host is poor, but it seems that cell-wall-degrading enzymes may play some role in the penetration process (Okonkwo & Nwoke, 1978;Maiti et al, 1984;Nagar, Singh & Sanwal, 1984). In Phlebia tremellosa, a white-rot fungus, supplementary nitrogen delayed the appearance of lignin-degrading activity (Reid, 1991).…”

Section: Discussionmentioning

confidence: 99%

Nitrogen relations of the sorghum‐Striga hermonthica host‐parasite association: germination, attachment and early growth

1993

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SUMMARYThe probability of the parasitic angiosperm Striga hermonthica achieving a successful union with its sorghum host is in part dependent on the concentration of ammonium nitrate in the growth medium. Germination rates were higher with 1 mM than with 3 mM ammonium nitrate. Ammonium nitrate did not influence either the stability of active components of host root exudate, or their perception by the parasite's seed. High concentrations of ammonium nitrate did not significantly reduce the leakage of potassium ions from sorghum roots (although patterns of exudation may differ between groups of compounds). Thus, it appears that ammonium nitrate reduced either the production of stimulatory compounds, or their specific leakage from host roots. Subsequent attachment of the parasite radicle and early growth of the plant were also lower at higher concentration of ammonium nitrate, and possible reasons for these observations are discussed.

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“…In one of few biochemical studies, the activity of cell wall-degrading enzymes in Cuscuta reflexa, a stem parasite in the Convolvulaceae family, was examined (Nagar et al, 1984). The activity of exo-1,4-␤-d-glucosidase was about 50 times higher and xylanase was about 100 times higher in haustoria than in surrounding tissue.…”

Section: Penetrationmentioning

confidence: 99%

Plant-Plant Communications: Rhizosphere Signaling between Parasitic Angiosperms and Their Hosts1

1998

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Cell Wall Degrading Enzymes inCuscuta reflexaand Its Hosts

Cited by 66 publications

References 15 publications

De Novo Assembly and Characterization of the Transcriptome of the Parasitic Weed Dodder Identifies Genes Associated with Plant Parasitism

De Novo Assembly and Characterization of the Transcriptome of the Parasitic Weed Dodder Identifies Genes Associated with Plant Parasitism

Nitrogen relations of the sorghum‐Striga hermonthica host‐parasite association: germination, attachment and early growth

Plant-Plant Communications: Rhizosphere Signaling between Parasitic Angiosperms and Their Hosts1

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