Abstract
SUMMARY Seven ectomycorrhizal fungi were screened by a soybean cell division bioassay to determine their potential for cytokinin synthesis. Fungal isolates of Rhizopogon roseolus (Corda) Hollos and Suillus punctipes (Peck) Sing, released significant quantities of cytokinin‐like substances into the culture medium. In contrast, Cenococcum geophilum (Fr.), Hebeloma crustuliniforme (Bull. ex. St. Amans) Qual., Pisolithus tinctorius (Pers.) Coker and Couch, Suillus granulatus (L. ex. Fr.) O. Kuntze, and Thelephora terrestris (Ehrh.) Fr. failed to elicit a positive cytokinin response in the soybean bioassay. Purification of S. punctipes culture filtrates by cation exchange, organic solvent partitioning, and separation on Sephadex LH‐20 revealed the presence of compounds with the same retention volume as zeatin and zeatin riboside. Greenhouse studies with loblolly pine ( Pinus taeda L.) indicated that, together with improved plant growth and enhanced mineral nutrition, P. tinctorius mediated a significant effect on host cytokinin relations. Cytokinin activity of extracted needles increased 44 and 30% for 12‐ and 14‐month‐old seedings, respectively, following ectomycorrhizal establishment. Axenically grown seedlings colonized by 5. punctipes showed no alterations in growth, nutrition, or cytokinin concentration, compared to non‐inoculated controls, even though mycorrhizal formation exceeded 30%. The ability of ectomycorrhizal fungi to affect host cytokinins was not dependent upon an ability to synthesize cytokinins in pure culture. Results are discussed in relation to improved mineral nutrition, enhanced root growth, and increased short‐root proliferation in the ectomycorrhizal association.
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Claims 11
Claim · model-written summary
Rhizopogon roseolus released significant cytokinin like substances.
- Taxon
- loblolly pine
Pinus taedat0 - Interactor
- Rhizopogon roseolus
Rhizopogon roseoluse0symbiont - Outcome
- cytokinin‐like substancese0
- Setting
- culture mediume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fungal isolates of Rhizopogon roseolus (Corda) Hollos and Suillus punctipes (Peck) Sing, released significant quantities of cytokinin‐like substances into the culture medium.”
t0“loblolly pine”
Claim · model-written summary
Suillus punctipes released significant cytokinin like substances.
- Taxon
- loblolly pinePinus taedat0
- Interactor
- Suillus punctipes
Suillus punctipese0symbiont - Outcome
- cytokinin‐like substancese0
- Setting
- culture mediume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fungal isolates of Rhizopogon roseolus (Corda) Hollos and Suillus punctipes (Peck) Sing, released significant quantities of cytokinin‐like substances into the culture medium.”
t0“loblolly pine”
Claim · model-written summary
Five fungal isolates failed to elicit a positive cytokinin bioassay response.
- Taxon
- loblolly pinePinus taedat0
- Interactor
- Cenococcum geophilum
Cenococcum geophilume0symbiont - Outcome
- failed to elicit a positive cytokinin responsee0
- Qualifier
- Hebeloma crustuliniforme (Bull. ex. St. Amans) Qual., Pisolithus tinctorius (Pers.) Coker and Couch, Suillus granulatus (L. ex. Fr.) O. Kuntze, and Thelephora terrestrise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cenococcum geophilum (Fr.), Hebeloma crustuliniforme (Bull. ex. St. Amans) Qual., Pisolithus tinctorius (Pers.) Coker and Couch, Suillus granulatus (L. ex. Fr.) O. Kuntze, and Thelephora terrestris (Ehrh.) Fr. failed to elicit a positive cytokinin response in the soybean bioassay.”
t0“loblolly pine”
Claim · model-written summary
Suillus punctipes filtrates contained compounds with retention volume matching zeatin and zeatin riboside.
- Taxon
- loblolly pinePinus taedat0
- Interactor
- S. punctipesSuillus punctipese0symbiont
- Outcome
- compounds with the same retention volume as zeatin and zeatin ribosidee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“S. punctipes culture filtrates by cation exchange, organic solvent partitioning, and separation on Sephadex LH‐20 revealed the presence of compounds with the same retention volume as zeatin and zeatin riboside.”
t0“loblolly pine”
Claim · model-written summary
Pisolithus tinctorius improved pine growth.
- Taxon
- loblolly pinePinus taedat0
- Treatment
- P. tinctoriuse0
- Interactor
- P. tinctorius
Pisolithus tinctoriuse0symbiont - Outcome
- plant growthe0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“together with improved plant growth and enhanced mineral nutrition, P. tinctorius mediated a significant effect on host cytokinin relations”
t0“loblolly pine”
Claim · model-written summary
Pisolithus tinctorius enhanced pine mineral nutrition.
- Taxon
- loblolly pinePinus taedat0
- Treatment
- P. tinctoriuse0
- Interactor
- P. tinctoriusPisolithus tinctoriuse0symbiont
- Outcome
- mineral nutritione0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“together with improved plant growth and enhanced mineral nutrition, P. tinctorius mediated a significant effect on host cytokinin relations”
t0“loblolly pine”
Claim · model-written summary
Pisolithus tinctorius significantly affected host cytokinin relations.
- Taxon
- loblolly pinePinus taedat0
- Treatment
- P. tinctoriuse0
- Interactor
- P. tinctoriusPisolithus tinctoriuse0symbiont
- Outcome
- host cytokinin relationse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P. tinctorius mediated a significant effect on host cytokinin relations”
t0“loblolly pine”
Claim · model-written summary
Mycorrhizal establishment raised needle cytokinin activity 44% at 12 months.
- Taxon
- loblolly pinePinus taedat0
- Treatment
- ectomycorrhizal establishmente0
- Outcome
- Cytokinin activity of extracted needlese0
- Direction
- increasede0
- Value
- 44e0
- Qualifier
- 12‐ and 14‐month‐old seedingse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cytokinin activity of extracted needles increased 44 and 30% for 12‐ and 14‐month‐old seedings, respectively, following ectomycorrhizal establishment.”
t0“loblolly pine”
Claim · model-written summary
Mycorrhizal establishment raised needle cytokinin activity 30% at 14 months.
- Taxon
- loblolly pinePinus taedat0
- Treatment
- ectomycorrhizal establishmente0
- Outcome
- Cytokinin activity of extracted needlese0
- Direction
- increasede0
- Value
- 30%e0
- Qualifier
- 14‐month‐olde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cytokinin activity of extracted needles increased 44 and 30% for 12‐ and 14‐month‐old seedings, respectively, following ectomycorrhizal establishment.”
t0“loblolly pine”
Claim · model-written summary
Suillus punctipes colonization did not alter growth, nutrition or cytokinin versus controls.
- Taxon
- loblolly pinePinus taedat0
- Treatment
- colonized by 5. punctipese0
- Interactor
- 5. punctipese0symbiont
- Outcome
- growth, nutrition, or cytokinin concentratione0
- Direction
- no alterationse0
- Value
- 30%e0
- Comparator
- non‐inoculated controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Axenically grown seedlings colonized by 5. punctipes showed no alterations in growth, nutrition, or cytokinin concentration, compared to non‐inoculated controls, even though mycorrhizal formation exceeded 30%.”
t0“loblolly pine”
Claim · model-written summary
Host cytokinin effects did not depend on fungal cytokinin synthesis in pure culture.
- Taxon
- loblolly pinePinus taedat0
- Interactor
- ectomycorrhizal fungie0symbiont
- Outcome
- host cytokininse0
- Qualifier
- not dependent upon an ability to synthesize cytokinins in pure culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ability of ectomycorrhizal fungi to affect host cytokinins was not dependent upon an ability to synthesize cytokinins in pure culture.”
t0“loblolly pine”
The same questions in other papers
Pisolithus tinctorius · growth · Pinus taeda (loblolly pine)Results differ
5 papers in the same direction as this paper · 3 in the opposite direction
- no effect
- no effect
- no effect
5 papers more in this group
See all 9 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.