Recent Progress in the Study of Endotrophic Mycorrhiza

Harley, J. L.

doi:10.1111/j.1469-8137.1950.tb07505.x

Cited by 31 publications

(18 citation statements)

References 79 publications

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“…Burges (1936) used the term 'casual mycorrhiza' to describe this type of infection. Harley (1950) pointed out that various fungi were grouped together in the genus Rhizoctonia and that some at least were pathogens. He later (1969) concluded that these fungi generally behave as weak parasites.…”

Section: Discussionmentioning

confidence: 99%

Observations on the Mycorrhizal Status of Some Alpine Plant Communities

Read¹,

1981

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SUMMARY In some Austrian alpine plant communities, levels of vesicular‐arbuscular mycorrhizal infection are highest in closed herb‐rich communities of intermediate altitudes (1900 to 2500 m). In fertilized hay meadows of lower altitudes (1600 m) and in the nival zone above 3000 m, endogonaceous infection is light. In the latter, it is mainly by the fine endophyte, Glomus tenuis. Many plants throughout the altitudinal range of the survey are infected with dark septate hyphae and, in the Cyperaceae, this is the dominant infection. Ectomycorrhizas occur on some herbaceous species as well as on Salix up to 2500 m. The possible significance of the infection patterns is discussed.

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Section: Discussionmentioning

confidence: 99%

Observations on the Mycorrhizal Status of Some Alpine Plant Communities

Read¹,

1981

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“…and BletiUa hyacinthina Rchb. f. ( Burgeff 1936, Harley 1951 ; these are somewhat easier co germinate. The great majority of species have relatively undifferentiated seeds, no cotyledons (Harley 1951, Maheshwari andNarayanaswami 1952), and no endosperm.…”

Section: The Orchid Seedmentioning

confidence: 99%

“…They are produced in large numbers, a supposed characteristic of higher groups (Rolfe 1962), ranging from 1,300 co 4,000,000 seeds per capsule (Darwin 1888, Anon. 1890, Harley 1951, Tournay 1960, Ardicti 1961. The information in Table I, although approximate and by no means complete, provides an idea of che sizes, weights, colors, and numbers of some orchid seeds.…”

Section: The Orchid Seedmentioning

confidence: 99%

“…It has been investigated by several workers but its exact nature and details are as yet unknown. The fungus penetrates the embryo through the suspensor cells or the epidermal hairs (Burge.ff 1936, Harley 1951, Ramsbottom 1922a, Knudson 1922. Profound changes occur in the embryo following infection.…”

Section: The Orchid Seedmentioning

confidence: 99%

“…Orchid seeds are minute, weigh from 0.3 co 14 IJ.g. (Burgeff 1936, Harley 1951 , and measure from 0.250 tO 1.2 mm. in length (Knudson 1922, Hoene 1940 and 0.090 co 0.270 mm.…”

Section: The Orchid Seedmentioning

confidence: 99%

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Factors affecting the germination of orchid seeds

1967

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Niacin Biosynthesis in Germinating×laeliocattleya Orchid Embryos and Young Seedlings

Arditti

1967

American J of Botany

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The roles of tryptophan, kynurenne, 3‐hydroxyanthranilic acid, and quinolinic acid as niacin precursors were investigated by assessing their germination and growth‐promoting effects in orchid embryo and seedling cultures. Only niacin, 3‐hydroxyanthranilic acid, quinolinic acid and kynurenine exhibited a growth‐promoting effect on seedlings of all ages. Tryptophan inhibited the growth of 70‐day‐old seedlings but enhanced growth of older seedlings. The data presented are interpreted to be consistent with the hypothesis that orchids may synthesize their niacin by a pathway similar to that of certain bacteria, fungi, birds, and mammals.

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Recent Progress in the Study of Endotrophic Mycorrhiza

Cited by 31 publications

References 79 publications

Observations on the Mycorrhizal Status of Some Alpine Plant Communities

Observations on the Mycorrhizal Status of Some Alpine Plant Communities

Factors affecting the germination of orchid seeds

Niacin Biosynthesis in Germinating×laeliocattleya Orchid Embryos and Young Seedlings

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