Host Invasion in Systemic Infections of Uromyces Caladii

Pady, S. M.

doi:10.1080/00275514.1939.12017376

Cited by 5 publications

(1 citation statement)

References 6 publications

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“…Herbivory is relatively insignificant, since the leaves, the corm, and the green berries are protected by crystals of calcium oxalate. Arisaema plants are also damaged by the rust Uromyces caladii, which is characteristically systemic (Pady 1939). An infected plant may live for several years, but may not produce a normal inflorescence.…”

Section: Natural History Of Arisaema Triphyllummentioning

confidence: 99%

The Demography of Jack‐in‐the‐Pulpit, a Forest Perennial that Changes Sex

Bierzychudek¹

1982

Ecological Monographs

351

282

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A size-classified transition matrix model of the demography of Arisaema triphyllum, a perennial herb of temperate deciduous forest, was constructed from 3 yr of field data from two dif~ere.nt sites. Ar!sa~n:za is quite unusual in that individuals change sex in a pattern determined by thetr stzes: small mdtvtduals do not flower, larger individuals reproduce as males, and the largest as females. As plants increase or decrease in size, they also may change sex.Though demographic parameters varied with the site and with the year, some consistent patterns were seen. Mortality rates ranged from 20 to 4()%,/yr for small, nonflowering plants, but decreased to ~uch lower levels as plants reached reproductive size. For these large plants, mortality rates did not dtffer between sexes or among size-classes. Because rates of sexual reproduction were severely pollinator limited, levels of seed production were low (averaging 7 seeds·female-'·yr-1 ) and were not correlated with plant size. All plants engaged in clonal reproduction, regardless of their size.. Transition matrices based on these data were compared statistically and were found to vary in ttme, as a result of year-to-year environmental variability. No population had achieved a stable size distribution. The classical method of calculating rate of increase, A., was therefore rejected, and an alternative method incorporating temporal stochasticity substituted. A sensitivity analysis was performed to evaluate the effect on population growth of changing various life history parameters. J:?ifferences in ra!es of individual growth and of clonal reproduction were found to be largely responsible for the relative success of the two populations, one of which was increasing, the other declining. Arisaema's status as a climax-forest herb suggests that temporally varying transition matrices might be common even in environments traditionally regarded as "stable." The prevalence of temporal variability has consequences both for the future direction of demographic theory and for the design and analysis of field studies.

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Section: Natural History Of Arisaema Triphyllummentioning

confidence: 99%

The Demography of Jack‐in‐the‐Pulpit, a Forest Perennial that Changes Sex

Bierzychudek¹

1982

Ecological Monographs

351

282

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Pathogen Impact on Sexual vs. Asexual Reproductive Success in Arisaema Triphyllum

Parker

1987

American J of Botany

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Populations of Arisaema triphyllum commonly harbor a systemic fungal pathogen, Uromyces ari‐triphylli, which reduces leaf area and leaf longevity. Infected plants produced 42% fewer asexual progeny (cormlets). Furthermore, all asexual progeny from infected parents were themselves infected with Uromyces. Mean seed production of infected plants was only 21% of that among healthy plants. A hand pollination experiment demonstrated that 1) infected male plants can produce viable pollen, 2) the low seed production of naturally pollinated infected females was not due to inadequate pollination, and 3) seed production among healthy female plants was strongly pollinator limited. Seeds from infected and healthy parents had similar viability, and all seeds germinating from both types of parents were uninfected. The contrast in disease transmission to sexual vs. asexual progeny suggests that pathogen attack may be one selective factor favoring sexual reproduction in A. triphyllum populations.

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Abnormal internal rust sori during the last 100 years

Shaw

1992

Mycologist

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Host Invasion in Systemic Infections of Uromyces Caladii

Cited by 5 publications

References 6 publications

The Demography of Jack‐in‐the‐Pulpit, a Forest Perennial that Changes Sex

The Demography of Jack‐in‐the‐Pulpit, a Forest Perennial that Changes Sex

Pathogen Impact on Sexual vs. Asexual Reproductive Success in Arisaema Triphyllum

Abnormal internal rust sori during the last 100 years

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