Penetration of western hemlock,<i>Tsuga heterophylla</i>, by the dwarf mistletoe<i>Arceuthobium tsugense</i>, and development of the parasite cortical system

Hunt, R. S.; Owens, John N.; Smith, Richard B.

doi:10.1080/07060669609500586

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…Scharpf and Parmeter (1967) showed a similar form of penetration in their photomicrographs. Hunt et al (1996) observed penetration by A. campylopodum at the base of needles on western hemlock. Penetration at the base of the spur shoot where the host's periderm is thin as opposed to penetration through the bark of the twig provides support for Hawksworth's speculation that the presence of thin bark is an important factor in penetration of older lodgepole pine trees by A. americanum (Hawksworth 1954).…”

Section: Discussionmentioning

confidence: 92%

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Germination, penetration, and infection by Arceuthobium americanum on Pinus banksiana

Brandt¹,

Hiratsuka²

2005

Can. J. For. Res.

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Information on the establishment of Arceuthobium americanum Nutt. ex Engelm. on its host, jack pine (Pinus banksiana Lamb.), is required to improve knowledge of this critical development stage and improve pest management. Laboratory and field observations on four populations of A. americanum seeds from Alberta collected in 2000 and 2001 and histological observations on one population were used to determine the timing and histopathology of parasite establishment on jack pine. Seed germination remained near zero until 110 d after placing seeds in storage; germination peaked after 230 d in 2001 and between 230 and 320 d in 2002. Interannual variation in germination timing at study sites was high. Interannual variation in percentage of germination was low, as was variation in percentage of germination from different seed sources. Germinated seeds of each seed source were significantly larger (48%) than seeds that did not germinate. Penetration at the base of spur shoots began during June-August and usually continued until June-July of the next year. The odds of infection when the germinant survived until the second growing season were 26-55 times greater than the odds of infection when the germinant withered in the first growing season. Symptoms of infection usually occurred 13-15 months after germination and were consistent for all seed sources and sites. Résumé: Il est nécessaire d'acquérir de l'information au sujet de l'établissement d'Arceuthobium americanum Nutt. ex Engelm. sur son hôte, Pinus banksiana Lamb., pour avoir une meilleure connaissance de ce stade critique de dévelop-pement et améliorer la gestion des ravageurs. Des observations en laboratoire et sur le terrain portant sur quatre populations de graines d'A. americanum, faites en 2000 et 2001 en Alberta, et des observations histologiques dans une population ont servi à déterminer le moment et l'histopathologie de l'établissement de ce parasite sur le pin gris. La germination des graines est demeurée presque nulle jusqu'à 110 j après que les graines eurent été entreposées. Elle a atteint un sommet après 230 j en 2001 et entre 230 et 320 j en 2002.La variation dans le moment de la germination était élevée dans les sites à l'étude. La variation interannuelle du pourcentage de germination était faible, ainsi que la variation dans le pourcentage de germination entre les différents lots de graines. Dans chaque lot de graines, les graines qui ont germé étaient significativement (48 %) plus grosses que celles qui n'ont pas germé. La pénétration à la base des branches fruitières commençait en juin-août et continuait habituellement jusqu'en juin-juillet de l'année suivante. Lorsque le germinat survivait jusqu'à la deuxième saison de croissance, les chances d'infection étaient 26-55 fois plus élevées que s'il flétrissait durant la première saison de croissance. Les symptômes de l'infection apparaissaient habituellement 13-15 mois après la germination et étaient consistants pour tous les lots de graines et tous les sites.[Traduit par la Rédaction] Brandt et al. 1...

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Section: Discussionmentioning

confidence: 92%

“…Murr.) in California, and by Hunt et al (1996) for A. campylopodum on western hemlock (Tsuga heterophylla (Raf.) Sarg.)…”

Section: Introductionmentioning

confidence: 99%

Germination, penetration, and infection by Arceuthobium americanum on Pinus banksiana

Brandt¹,

Hiratsuka²

2005

Can. J. For. Res.

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“…On reaching the host the mistletoe seeds germinate to produce small radicle followed by a hold fast and an ultimate penetration plug ( Hunt et al, 1996 , Knutson, 1984 ). The radical slowly grows and penetrates into cortex of host tissue followed by the development of root-like endophytic absorptive system ( Alosi and Calvin 1985 ).…”

Section: Discussionmentioning

confidence: 99%

On the macro-micro-morphology of organs of host invasion in hemiparasite Helicanthes elasticus (Desv.) Danser

Kumar

Kesanakurti

Senthilkumar

et al. 2021

Saudi Journal of Biological Sciences

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Loranthaceae family includes hemiparasitic members which are seen invading a wide range of commercial crops. Helicanthes elasticus (Desv.) Danser is very common on mango trees. Though parasitic in nature, this mistletoe is also medicinally important as fetoprotective, against vesicular calculi and kidney infections. This study is an attempt to document macro-microscopical features of parasitic root, fruit and host-mistletoe tissue interaction in the haustorium of H. elasticus growing on mango stems. Collection, preservation, sectioning, staining and photomicrography of the root, fruit and host-mistletoe union were done as per standard methodologies of anatomical studies. Though there is resemblance to the normal roots in morphology as well as anatomy, the microscopic finding of large number of branched stone cells in the roots is interesting. The morpho-anatomical features recorded would help in understanding the infection biology of this mistletoe. The eradication during the earlier stages of its establishment from seed or from the root creeping over the surface of the host can help in controlling this parasite infection on commercially important host plants.

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Histopathology of the endophytic system and aerial shoots of Arceuthobium americanum infected by Colletotrichum gloeosporioides

Ramsfield

Shamoun

Kamp

2012

Botany

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Infection of the endophytic system of Arceuthobium americanum parasitizing Pinus contorta var. latifolia by the fungus Colletotrichum gloeosporioides was assessed on naturally infected and inoculated localized dwarf mistletoe plants. Two different techniques were utilized to attempt to inoculate C. gloeosporioides into the endophytic system: the fungus was applied as Stabileze formulated product onto cut A. americanum shoots and as a mycelial plug to wounded A. americanum infected host branches. The fungus was cultured from infected shoots and the basal cup region of naturally infected A. americanum, but not pine tissues that included the endophytic system. Following inoculation of cut shoots, the shoots were abscised from the dwarf mistletoe plant, and the fungus was not isolated 1 year after inoculation. The fungus was recovered from the wounded region of infections that were inoculated with a mycelial plug, but not outside of the wounded area. Hyphae with morphology that matched that of C. gloeosporioides were observed microscopically in the shoots and basal cup region of naturally infected A. americanum, but not in the samples from the inoculated treatments. Thus, we were unable to confirm that C. gloeosporioides infected the endophytic system of A. americanum parasitizing P. contorta var. latifolia, although xylem continuity between the aerial and endophytic systems was observed.

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Penetration of western hemlock,Tsuga heterophylla, by the dwarf mistletoeArceuthobium tsugense, and development of the parasite cortical system

Cited by 5 publications

References 14 publications

Germination, penetration, and infection by Arceuthobium americanum on Pinus banksiana

Germination, penetration, and infection by Arceuthobium americanum on Pinus banksiana

On the macro-micro-morphology of organs of host invasion in hemiparasite Helicanthes elasticus (Desv.) Danser

Histopathology of the endophytic system and aerial shoots of Arceuthobium americanum infected by Colletotrichum gloeosporioides

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