Abstract
Although there is considerable variation among closely related species and varieties of plants, it is evident that there is a relation between the age of plant tissue and its natural capacity to form adventitious roots. This age factor can generally be overcome with the aid of hormone-like substances which serve as chemical growth regulators, and which have the power to induce adventitious roots on tissues where roots do not naturally appear. Cuttings of the lilac taken in May have the capacity to grow adventitious roots. This capacity gradually declines until it is completely gone by July. Cuttings of apples taken early in May form roots when treated with growth substances, but gradually decline until June. Cuttings from seedlings of difficultly propagated species have the capacity to form roots, whereas cuttings from old trees of the same species can seldom be induced to root, even with the aid of hormone-like substances, because they no longer have the capacity to make use of them. The mechanism in plants through which chemicals act is not understood, and it is further complicated because closely related species differ widely in their response. The new use of plant hormones has thrown some light on the subject, but it is reasonably certain that the change in structure or protoplasm with age is a major controlling factor.
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Claims 8
Claim · model-written summary
Plant tissue age relates to natural adventitious rooting capacity.
Not reportedDirection
Verbatim
e0“there is a relation between the age of plant tissue and its natural capacity to form adventitious roots”
Claim · model-written summary
Hormone-like growth regulators can induce roots on tissues where roots do not naturally appear.
- Treatment
- hormone-like substancese0
- Outcome
- induce adventitious rootse0
- Comparator
- tissues where roots do not naturally appeare0
Not reportedTaxonDirection
Verbatim
e0“hormone-like substances which serve as chemical growth regulators, and which have the power to induce adventitious roots on tissues where roots do not naturally appear”
Claim · model-written summary
Lilac cuttings taken in May can form adventitious roots.
Verbatim
e0“Cuttings of the lilac taken in May have the capacity to grow adventitious roots”
Claim · model-written summary
Lilac cuttings gradually lose rooting capacity by July.
Not reportedTaxonSetting
Verbatim
e0“This capacity gradually declines until it is completely gone by July”
Claim · model-written summary
Apple cuttings taken early in May rooted with growth substances but their capacity declined until June.
- Taxon
- apples
Malus domesticae0 - Treatment
- growth substancese0
- Outcome
- form rootse0
- Qualifier
- gradually decline until Junee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cuttings of apples taken early in May form roots when treated with growth substances, but gradually decline until June”
Claim · model-written summary
Seedling cuttings of difficult species can root.
Verbatim
e0“Cuttings from seedlings of difficultly propagated species have the capacity to form roots”
Claim · model-written summary
Cuttings from old trees seldom root even with hormone-like substances.
Verbatim
e0“cuttings from old trees of the same species can seldom be induced to root, even with the aid of hormone-like substances”
Claim · model-written summary
Age-associated structural or protoplasmic change is proposed as a major rooting control.
Not reportedTaxon
Verbatim
e0“the change in structure or protoplasm with age is a major controlling factor”