{"doi":"10.1086/334962","title":"Effect of Growth Substances on the Absciss Layer in Leaves of Coleus","abstract":null,"journal":"Botanical Gazette","year":1940,"id":53973,"datarank":9.521089475699146,"base_score":4.143134726391533,"endowment":4.143134726391533,"self_citation_contribution":0.62147020895873,"citation_network_contribution":8.899619266740416,"self_endowment_contribution":0.62147020895873,"citer_contribution":8.899619266740416,"corpus_percentile":null,"corpus_rank":null,"citation_count":62,"citer_count":62,"citers_with_citation_signal":58,"citers_with_endowment":58,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":null,"is_data_producer":false,"deposit_databanks":null,"is_oa":false,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":null,"fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":276801,"name":"R. Maurice Myers","orcid":null,"position":0,"is_corresponding":false}],"reference_count":0,"raw_metadata":{"has_enrichment":true,"resolved":true,"title":"Effect of Growth Substances on the Absciss Layer in Leaves of Coleus","abstract":"1. Following the reports of others that growth substances and materials containing them delay abscission of debladed petioles, a study of their effects in relation to several other factors that affect abscission was made. 2. Growth of the coleus leaf is basipetal. 3. The blade is 85-90 per cent expanded before the absciss layer is initiated in the third pair of leaves and is mature in the sixth pair of leaves of plants bearing eight pairs. 4. Abscission usually occurs in the absciss layer, but under certain treatments it may occur without development of this layer. 5. Older leaves usually abscise before younger leaves, and factors that accelerate abscission cause older leaves to abscise first. 6. Removal of the blade accelerates abscission of all petioles, except the first pair of leaves. A well-defined absciss layer develops in these leaves after several months. 7. Partially debladed petioles do not abscise as soon as petioles from which the entire blade has been removed. Actively expanding portions of the blade are more effective in checking abscission than the mature parts. 8. The basal half of the blade delays abscission 7-10 days longer than the lower one-eighth of the blade, but not so long as the intact blade. 9. A greater amount of phytohormones diffuses from petioles of the upper leaves than from the lower leaves. 10. Tests for growth substances diffusing from leaves were negative or very low during the winter. 11. The upper intact leaves and the opposite debladed petioles treated with 1 per cent heteroauxin usually abscise in about the same time. The lower intact leaves abscise 1-7 days before the treated debladed petioles, indicating that heteroauxin delays the final stages of abscission in addition to delaying development of the absciss layer. 12. Abscission is more rapid in the spring and summer than in the winter. 13. Heteroauxin applied to debladed petioles has an effect similar to the blade in delaying abscission and favoring continued development of the petioles. 14. Development of the absciss layer and abscission is accelerated in leaves of plants placed in the dark. Heteroauxin inhibits the abscission of these leaves. 15. Heteroauxin will pass through debladed petioles which have been severed except for four or five layers of outer cortical cells in sufficient quantities to delay abscission for several days. 16. The effect of the blades passes through cells of petioles severed in a similar manner and delays abscission. 17. The pre-abscission period of debladed petioles of cuttings is increased by placing them in a strong solution of heteroauxin. 18. One and 0.5 per cent concentrations of heteroauxin are about equally effective in delaying abscission but are about 25 per cent more effective than a 0.1 per cent concentration. 19. Indolepropionic and indolebutyric acids have a similar effect in delaying abscission. 20. All experiments indicate that growth substances from the blades influence the development of the absciss layer and the process of abscission, but their relation to abscission phenomena does not seem to be a simple one.","is_dataset_classified":null,"base_score":4.143134726391533,"endowment":4.143134726391533,"datacite_reuse_total":0,"file_count":0,"downloads":0,"views":0,"has_version_chain":false,"is_dataset":false,"is_oa":false,"pmid":"18998783","pmcid":null,"openalex_id":"https://openalex.org/W2002615930","authors":[],"funders":[],"total_grants":0,"fwci":14.6108,"citation_percentile":0.97866349,"influential_citations":1,"citation_trend":[{"year":2016,"count":1}],"oa_status":"closed","license":null,"oa_locations":[{"url":"http://www.journals.uchicago.edu/doi/pdf/10.1086/334962","host_type":"publisher"},{"url":"https://doi.org/10.1086/334962","host_type":"journal"}],"fields_of_study":["Plant Physiology and Cultivation Studies","Biology"],"mesh_terms":[],"keywords":["Abscission","Coleus","Leaf blade","Biology","Botany","Horticulture"],"sdg_mappings":[{"sdg_number":0,"sdg_label":"Life in Land"}],"linked_datasets":[],"clinical_trials":[],"software_tools":[],"database_accessions":[],"source":"live","citation_network_status":"fetched"},"created_at":"2026-07-18T20:57:12.007684Z","pmid":null,"pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}