Evolution of the secondary haustoria to a primary haustorium in the parasiticScrophulariaceae/Orobanchaceae

Weber, Hans Christian

doi:10.1007/bf00936067

Cited by 16 publications

(9 citation statements)

References 10 publications

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“…We assume that the characteristic features of the composition and distribution of the different trichome types in the African species indicate a higher indumentum specialization in Striga species and in Rhamphicarpa fistulosa than in Buchnera hispida and the Rhinantheae species studied, Striga species and Rhamphicarpa fistulosa present an advanced biology: Striga species, except Striga angustifolia (Krause, 1990), cannot germinate without a host plant, and penetrate the host tissue by developing primary haustoria, which are regarded as more advanced in comparison to secondary haustoria (Weber, 1987(Weber, , 1993. Rhamphicarpa fistutosa is generally reported as less host-dependent as it is able to germinate and complete its life cycle without a host plant (Ouedraogo, 1995).…”

Section: Lndumentum and Evolutionary Trendsmentioning

confidence: 99%

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Characteristic Trichomes and Indumentum Specialization in African and European Parasitic Scrophulariaceae

et al. 1998

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Trichomes and their distribution patterns have been observed in the aerial parts of plants of the genera Striga, Buchnera, Rhamphicarpa, Euphrasia, Melampyrum and Rhinanthus, using both light (LM) and scanning electron microscopy (SEM). All trichomes belong to the multicellular, uniseriate category and can be classified as glandular and nonglandular types. On nearly all organs, the two types can be observed side by side. Apart from a large group of ubiquitous trichomes, some characteristic trichome types are reported; they are restricted either to chlorophyllous organs (foliage leaves, bracts, calyx and stem) or to the corolla, In some nonglandular trichomes minerai deposits have been found. Other morphological and anatomical trichome features are discussed with regard to their possible function.

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Section: Lndumentum and Evolutionary Trendsmentioning

confidence: 99%

“…The former develop during germination of the parasites and thus represent a developmental stage of the parasitic plants, whereas the latter are only lateral organs additionally formed on the corm. Therefore, primary haustoria can be definitely considered as more advanced (Weber, 1987).…”

Section: Introductionmentioning

confidence: 99%

Characteristic Trichomes and Indumentum Specialization in African and European Parasitic Scrophulariaceae

et al. 1998

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“…It is generally accepted, not only for mistletoes but for parasitic angiosperms generally (Kuijt 1969;Weber 1980), that primary haustoria represent a late evolutionary acquisition. I have argued previously (Kuijt 1969) that, among mistletoes, the acquisition of primary haustoria has paralelled the evolutionary 'ascent of the tree'.…”

Section: Cryptocotyly and Gamocotylymentioning

confidence: 99%

Correlations in the germination patterns of Santalacean and other mistletoes

Kuijt¹

1990

The Plant Diversity of Malesia

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SummaryWithin a framework of the emerging ecological (rather than merely systematic) content of the concept 'mistletoe', various observations are presented on embryo and seedling structure of the Santalacean mistletoes, i.e., Phacellaria and the 'Henslowia' complex of genera. An attempt is made to interpret, and to extrapolate from, observations on gamocotyly and embryo reduction in the light of certain parallel evolutionary developments in Eremolepidaceae, Loranthaceae, and Viscaceae. It is suggested that cryptocotyly and primary haustoria, and consequently unitunicate radicular apices and adventitious shoot generation from the haustorial disk and/ or endophytic system, have evolved in a number of Santalacean mistletoes.

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“…Rhamphicarpa fistulosa belongs to the group of parasites which attack the host roots exclusively by means of haustoria which are initiated laterally along the elongating roots of the parasite (Bouriquet, 1933;Ouedraogo, 1995;Ouedraogo et al, 1998). These secondary haustoria are thought to be more primitive than the primary haustoria of Striga or Orobanche (Kuijt, 1969), which represent not only an organ of the developing parasite but also a developmental stage in its life cycle (Weber, 1987).…”

Section: Haustorial Initiation and Developmentmentioning

confidence: 99%

Development and Structure of the Haustorium of the Parasite Rhamphicarpa fistulosa (Scrophulariaceae)

1998

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Rhamphicarpa fistulosa (Hochst.) Benth. (Scrophulariaceae), a parasite of African cereals, develops secondary haustoria which penetrate the roots of the host plant. Light and electron microscopy have been used to study the structure and development of haustoria in this species, which, until now, have not been well characterized. Haustoria are initiated in the hypodermis of the parasite roots. A meristematic strand is developed between the parasite root stele and the host‐parasite interface. From this strand, cells differentiate into xylem elements after penetration of the host root. Xylem differentiation follows an acropetal pattern. Mature haustoria are characterized by a continuous xylem bridge between water conducting elements of parasite and host. A detailed study of the hostparasite interface revealed the presence of collapsed and compressed host cells at the lateral interface (between parasite cells and host cortex), whereas the central interface between parasite cells and the host stele is almost devoid of host cell remnants. Implications of these observations for the penetration mechanisms are discussed.

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Evolution of the secondary haustoria to a primary haustorium in the parasiticScrophulariaceae/Orobanchaceae

Cited by 16 publications

References 10 publications

Characteristic Trichomes and Indumentum Specialization in African and European Parasitic Scrophulariaceae

Characteristic Trichomes and Indumentum Specialization in African and European Parasitic Scrophulariaceae

Correlations in the germination patterns of Santalacean and other mistletoes

Development and Structure of the Haustorium of the Parasite Rhamphicarpa fistulosa (Scrophulariaceae)

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