Soluble sugar concentrations in needles and bark of western white pine in response to season and blister rust /

Martin, N.

doi:10.5962/bhl.title.68946

Cited by 2 publications

(2 citation statements)

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“…Carbohydrate concentrations may also play a role in consumption (Jones and Roberts 1991). In fall and winter, foliar raffinose and sucrose concentrations increase in conifers (Little 1970, Martin 1987, Hinesley et al 1992. Further, Hinesley et al (1992) found that maximal raffinose and sucrose concentrations in pinus strobus L. and Pinus virginiana L. were related to daily minimal temperatures in the preceding 30 days.…”

Section: Discussionmentioning

confidence: 96%

Factors Influencing Pine Needle Consumption by Grazing Cattle during Winter

Pfister¹,

Adams²

1993

Journal of Range Management

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Ponderosa pine (Pinurpondcroso Lawson) needles cause rbortions in pregnant cows. We examined pine needle consumption by cattle in 2 trlnls in eastern Montana. Trial 1 compared pregnant and open cows (n=4) from January to March 1989; trial 2 compared pregnant cattle (n=4) that received either 9 kg alfalfa hay head" day-' or 1.4 kg alfalfa pellets head" day" from December 1989 to February 1990. Diets were estimated using both bite counts and fecal analysis. During trial 1, bite counts revealed pregnant and open cows consumed 45 and 42% of their grazing diets as pine needles (-0.1). Fecal analysis showed that pregnant cows consumed more pine needles than did open cows (36% vs. 27%, respectively) (P

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Section: Discussionmentioning

confidence: 96%

Factors Influencing Pine Needle Consumption by Grazing Cattle during Winter

Pfister¹,

Adams²

1993

Journal of Range Management

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“…Carbohydrate concentrations in the host may reflect patterns of demands and periods of metabolism and dormancy of both the host and the obligate parasite C. ribicola . For example, with C. ribicola ‐infected P. monticola bark, Martin (1987) found that fungal metabolism is relatively greater than host metabolism during February. This is a period of early aeciospore development that coincides with late host dormancy.…”

Section: Discussionmentioning

confidence: 99%

Anatomical and cellular responses of Pinus monticola stem tissues to invasion by Cronartium ribicola

et al. 2005

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White pine blister rust (Cronartium ribicola) causes extensive damage to white pines and their associated ecosystems across North America. The anatomical and cellular characteristics of C. ribicola colonization in Pinus monticola branch and stem tissues were studied as a basis for understanding host tree reactions that may be related to resistance. Samples examined showed typical fusiform swelling and some had produced aecia. The reaction of phloem and xylem tissues was compared with noninfected tissue using light and electron microscopy. Cortical parenchyma and phloem polyphenolic parenchyma cells underwent mitotic division, cell swelling, and ca sixfold greater accumulation of phenolic compounds in colonized vs. control stems. In the cortex and secondary phloem, haustoria were common in parenchymatous cells, and hyphae were abundant in the intercellular spaces, but cell death was rare, unless aecia had ruptured the stem cortex. Hyphae were also common in xylem rays, tracheids and between tracheids. Disease-induced changes in the cambial zone included development of cambium-derived xylem traumatic resin ducts. Results demonstrate that diverse host defence responses were activated in the bark of apparently susceptible trees, but lack of mechanical damage by C. ribicola to the phenol-containing host cells and the resin duct system allowed extensive colonization and development of aecia despite elicitation of these stem defences. Interactions between P. monticola and C. ribicola are discussed and compared with other conifer-fungus pathosystems.

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Soluble sugar concentrations in needles and bark of western white pine in response to season and blister rust /

Cited by 2 publications

References 13 publications

Factors Influencing Pine Needle Consumption by Grazing Cattle during Winter

Factors Influencing Pine Needle Consumption by Grazing Cattle during Winter

Anatomical and cellular responses of Pinus monticola stem tissues to invasion by Cronartium ribicola

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