Haustoria


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Related to Haustoria: haustorial

haustoria

[hau̇′stȯr·ē·ə]
(mycology)
Specialized branches of hyphae that penetrate host cells and absorb nutrients from them.

Haustoria

 

in plants, unicellular or multicellular formations that serve to absorb various substances.

Haustoria in parasitic angiosperms (for example, in the dodder and the broomrape) are multicellular formations that are, for the most part, modified roots. They develop upon contact of the parasitic plant with the body of the host plant, taking root in the host’s tissue and absorbing nutritive substances from it. The haustoria of endosperms and of other structures of the embryonic sac in certain angiosperms are modified cells that serve to increase the intake of nutritive substances by the embryo from the surrounding tissues. In fungi the haustoria are outgrowths of the fungus cells that penetrate into the host’s cells.

References in periodicals archive ?
Soil solarization provided total control of Egyptian broomrape because shoot emergence from treated soil was completely inhibited and no haustoria or underground tubercles were found on the cucumber roots at the end of the crop cycle.
This contrasts with the high stimulant line CK60 that forms recognizable haustoria within 2 d after ethylene treatment (arrows in Fig.
Interface between haustoria of parasitic members of the Scrophulariaceae and their hosts: A histochemical and immunocytochemical approach.
Parasitic flowering plant An obligate parasite that lacks a root system and instead uses a haustoria to absorb water and nutrients from its host.
A reduction in large callose deposits surrounding haustoria of Peronospora parasitica infecting Arabidopsis thaliana was indirectly achieved in transgenic plants not accumulating Salicylic acid (SA) by expression of the enzyme salicylate hydroxylase (Donofrio and Delaney , 2001).
Because seedlings in the EAGA could be grown for longer periods, effects of signal exchanges between sorghum roots and striga haustoria as well as host defense responses beyond germination could be observed.
These roots develop structures known as haustoria, which anchor themselves into the water and mineral conducting vessels of the tree.
From excavation and examination of haustoria, I have determined that Triphysaria are generalist parasites, potentially affecting a broad diversity of angiosperm hosts (personal observation).
Chalazal haustoria are recorded in Anthericum (Schnarf, 1928), Curculigo (Schlimbach, 1924), Cyanella (De Vos, 1950), and Empodium (De Vos, 1949).
The researchers report that a Striga root tip releases an enzyme that they think diffuses through the soil and reacts with a sorghum root to form another quinone compound, which in turn diffuses back toward the Striga root, where it triggers haustoria formation.
pisi is an obligate biotroph (Huckelhoven, 2005), which grow and propagate through haustoria by redirecting the host's metabolism without causing the death of host (Perfect and Green, 2001; Belanger et al.