Targeted distribution of photo-assimilate in Striga hermonthica (Del.) Benth parasitic on Sorghum bicolor L.

Santos-Izquierdo, Beatriz; Pageau, Karine; Fer, A.; Simier, Philippe; Robins, Richard J.

doi:10.1016/j.phytol.2008.01.003

Cited by 4 publications

(6 citation statements)

References 19 publications

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“…These contrasting patterns suggest an intensive retranslocation and metabolic processing of the host‐borne resources in the hemiparasite. A very similar pattern was also detected in S. hermonthica ; however, the differential allocation of carbon originating from different sources was much more pronounced (Santos‐Izquierdo et al. , 2008).…”

Section: Discussionsupporting

confidence: 64%

“…These contrasting patterns suggest an intensive retranslocation and metabolic processing of the host-borne resources in the hemiparasite. A very similar pattern was also detected in S. hermonthica; however, the differential allocation of carbon originating from different sources was much more pronounced (Santos-Izquierdo et al, 2008). The elevated proportion of host-derived carbon in the upper parts of shaded seedlings indicates that under extreme deficiency of autotrophic assimilates, host-derived carbon can be also directed to vertical growth.…”

Section: New Phytologistsupporting

confidence: 64%

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The role of heterotrophic carbon acquisition by the hemiparasitic plant Rhinanthus alectorolophus in seedling establishment in natural communities: a physiological perspective

et al. 2011

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Summary Heterotrophic acquisition of substantial amounts of organic carbon by hemiparasitic plants was clearly demonstrated by numerous studies. Many hemiparasites are, however, also limited by competition for light preventing the establishment of their populations on highly productive sites. In a growth‐chamber experiment, we investigated the effects of competition for light, simulated by shading, on growth and heterotrophic carbon acquisition by the hemiparasite Rhinanthus alectorolophus attached to C3 and C4 hosts using analyses of biomass production and stable isotopes of carbon. Shading had a detrimental effect on biomass production and vertical growth of the hemiparasites shaded from when they were seedlings, while shading imposed later caused only a moderate decrease of biomass production and had no effect on the height. Moreover, shading increased the proportion of host‐derived carbon in hemiparasite biomass (up to 50% in shaded seedlings). These results demonstrate that host‐derived carbon can play a crucial role in carbon budget of hemiparasites, especially if they grow in a productive environment with intense competition for light. The heterotrophic carbon acquisition can allow hemiparasite establishment in communities of moderate productivity, helping well‐attached hemiparasites to escape from the critical seedling stage.

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Section: Discussionsupporting

confidence: 64%

Section: New Phytologistsupporting

confidence: 64%

The role of heterotrophic carbon acquisition by the hemiparasitic plant Rhinanthus alectorolophus in seedling establishment in natural communities: a physiological perspective

et al. 2011

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“…Thus, mixotrophic species should be pushed by mutational drift to heterotrophy once mixotrophy is achieved, because the persistence of a costly, redundant photosynthetic carbon source is evolutionarily unexpected. Evolution of full heterotrophy however requires special adaptations: in full plant parasites (holoparasites), improved carbon nutrition is mostly associated with the uptake resources from host phloem [11]; in full mycoheterotrophs, a switch to different fungal partners providing more carbon is often observed [1]. Recent evidence suggests such evolutionary steps may be difficult, requiring e.g.…”

Section: Mixotrophy Is Evolutionarily Metastablementioning

confidence: 99%

“…The organic resources derived from a fungal partner or a host with C4 metabolism naturally differ from the photosynthates of the mixotroph in carbon stable isotope composition ( 13 C/ 12 C ratio). This allows to estimate the carbon contributions of heterotrophic and autotrophic pathways in different organs, based on 13 C enrichment [4,6,11]. In orchids that are partially mycoheterotrophic at adulthood, 13 C enrichment shows that fungal carbon is used for rhizome survival and initial growth of the inflorescence [6].…”

Section: Mixotrophy Is Evolutionarily Metastablementioning

confidence: 99%

“…In orchids that are partially mycoheterotrophic at adulthood, 13 C enrichment shows that fungal carbon is used for rhizome survival and initial growth of the inflorescence [6]. Similarly, hemiparasitic Striga hermonthica relies on host-derived carbon during the early ontogeny [11]. Conversely, mixotrophs use their own photosynthates after leaf expansion for fruits and seeds maturation in both cases [6,11].…”

Section: Mixotrophy Is Evolutionarily Metastablementioning

confidence: 99%

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