Abstract
Abstract The relationship between leaf water potential and rooting was investigated in cuttings of Rhododendron (Hardy Hybrid) ‘Mrs. W. Agnew’, Ceanothus thyrsiflorus Esch. and Hebe (Garden Hybrid) ‘Caledonia’ (of the ‘Mrs. Winder’ group), during propagation under mist and polythene. Water potentials well below –10 bars frequently occurred and low mean water potentials related to poor rooting. Propagation under polythene gave better results than mist in the lower radiation conditions of winter but the reverse occurred under high radiation conditions. Treatment of cuttings with a poly‐vinyl resin antitranspirant coating temporarily increased leaf water potentials in the consistently humid conditions under polythene but not under mist. The coating peeled and lost its effectiveness within 6 weeks. Multiple regression analysis showed that much of the variation in water potential in cuttings under mist could be accounted for by inclusion of three variables, viz . current day's radiation, number of days from insertion of the cuttings and either the previous day's leaf water potential or radiation. Under polythene the influence of yesterday's water potential was relatively unimportant, probably because cuttings were able to take up water overnight from condensation on the under surface of the polythene. For optimal rooting, propagation procedure must ensure that high leaf water potentials are maintained, but conventional methods do not always achieve this.
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Claims 8
Claim · model-written summary
Low mean leaf water potentials of Rhododendron cuttings were related to poor rooting.
- Taxon
- Rhododendron
Rhododendrone0 - Treatment
- low mean water potentialse1
- Outcome
- rootinge1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cuttings of Rhododendron (Hardy Hybrid)”
e1“low mean water potentials related to poor rooting”
Claim · model-written summary
Propagation under polythene gave better rooting results than mist in lower radiation conditions of winter.
- Taxon
- RhododendronRhododendrone0
- Treatment
- polythenee2
- Outcome
- resultse2
- Direction
- bettere2
- Comparator
- miste2
- Setting
- lower radiation conditions of wintere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cuttings of Rhododendron (Hardy Hybrid)”
e2“Propagation under polythene gave better results than mist in the lower radiation conditions of winter”
Claim · model-written summary
Propagation under mist gave better rooting results than polythene in high radiation conditions.
- Taxon
- RhododendronRhododendrone0
- Treatment
- miste2
- Outcome
- resultse2
- Direction
- reversee3
- Comparator
- polythenee2
- Setting
- high radiation conditionse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cuttings of Rhododendron (Hardy Hybrid)”
e2“Propagation under polythene gave better results than mist in the lower radiation conditions of winter”
e3“but the reverse occurred under high radiation conditions”
Claim · model-written summary
An antitranspirant coating temporarily increased leaf water potentials of Rhododendron cuttings under polythene.
- Taxon
- RhododendronRhododendrone0
- Treatment
- antitranspirant coatinge4
- Outcome
- leaf water potentialse4
- Direction
- increasede4
- Qualifier
- temporarilye4
- Setting
- under polythenee4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cuttings of Rhododendron (Hardy Hybrid)”
e4“Treatment of cuttings with a poly‐vinyl resin antitranspirant coating temporarily increased leaf water potentials in the consistently humid conditions under polythene but not under mist”
Claim · model-written summary
An antitranspirant coating did not increase leaf water potentials of Rhododendron cuttings under mist.
- Taxon
- RhododendronRhododendrone0
- Treatment
- antitranspirant coatinge4
- Outcome
- leaf water potentialse4
- Setting
- under miste4
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cuttings of Rhododendron (Hardy Hybrid)”
e4“Treatment of cuttings with a poly‐vinyl resin antitranspirant coating temporarily increased leaf water potentials in the consistently humid conditions under polythene but not under mist”
Claim · model-written summary
The antitranspirant coating peeled and lost its effectiveness within 6 weeks.
- Taxon
- RhododendronRhododendrone0
- Outcome
- effectivenesse5
- Value
- 6 weekse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cuttings of Rhododendron (Hardy Hybrid)”
e5“The coating peeled and lost its effectiveness within 6 weeks”
Claim · model-written summary
Yesterday's leaf water potential had relatively little influence on water potential under polythene.
- Taxon
- RhododendronRhododendrone0
- Outcome
- influence of yesterday's water potentiale7
- Setting
- Under polythenee7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cuttings of Rhododendron (Hardy Hybrid)”
e7“Under polythene the influence of yesterday's water potential was relatively unimportant”
Claim · model-written summary
For optimal rooting, propagation must maintain high leaf water potentials.
- Taxon
- RhododendronRhododendrone0
- Outcome
- high leaf water potentialse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cuttings of Rhododendron (Hardy Hybrid)”
e1“For optimal rooting, propagation procedure must ensure that high leaf water potentials are maintained”