{"corpus_id":129598584,"paper_sha":"a0166c24378c9e02ccbac71d3b8275c3f8d53d06","doi":"10.2136/SSSAJ1982.03615995004600020027X","arxiv_id":null,"pmid":null,"pmcid":null,"mag_id":2061116170,"dblp_id":null,"acl_id":null,"title":"Phosphorus Accumulation and Toxicity in Leaves in Relation to Zinc Supply1","year":1982,"publication_date":"1982-03-01","venue":"","journal":{"name":"Soil Science Society of America Journal","pages":"345-352","volume":"46"},"journal_issn":null,"journal_title":null,"publication_types":[],"pubmed_pub_types":null,"s2_fields_of_study":["Chemistry","Environmental Science"],"reference_count":0,"citation_count":192,"influential_citation_count":5,"is_open_access":false,"arxiv_categories":null,"arxiv_license":null,"arxiv_journal_ref":null,"mesh_headings":null,"chemicals":null,"comments_corrections":null,"source_flags":1,"s2_open_access_pdf_url":null,"s2_open_access_landing_url":null,"s2_open_access_license":null,"s2_open_access_status":null,"pmc_open_access_pdf_url":null,"pmc_open_access_landing_url":null,"pmc_open_access_license":null,"pmc_open_access_status":null,"unpaywall_open_access_pdf_url":null,"unpaywall_open_access_landing_url":null,"unpaywall_open_access_license":null,"unpaywall_open_access_status":null,"abstract":"Abstract The relationship of zinc (Zn) deficiency to phosphorus (P) toxicity was examined in ‘Emerald’ okra [ Abelmoschus esculentus (L.) Moench] grown for 21 days (D 21 ) in complete nutrient solution and then transferred to treatments with two levels of P (P 1 , P 2 = 250, 2,000 µ M P) and four levels of Zn (Zn 1 , Zn 2 , Zn 3 , Zn 4 = 0, 0.25, 1, 2 µ M added Zn). No symptoms of “little leaf” or “rosetting” developed in any plants. “Mottle leaf” symptoms developed as chlorotic and necrotic patches in the interveinal areas of the older leaves of Zn 1 plants at P 1 and in Zn 1 , Zn 2 , and Zn 3 plants at P 2 . Thus, increasing the level of P induced symptoms which were eliminated by adding Zn. Treatments had little effect on dry matter at D 45 and D 63 : at D 111 , low Zn depressed dry weight of P 1 tops and even more markedly depressed dry weight of P 2 tops, roots, and fruits. Increasing solution P increased the concentration and amount of P in all plant parts at all harvests. At D 45 it also depressed Zn concentrations in all parts of Zn 1 plants but in no other Zn treatment and in no treatment at later harvests. At Zn 1 , leaves had relatively low concentrations of Zn and high concentrations of P. Increasing levels of Zn enhanced their Zn concentrations and depressed their P concentrations; at D 45 and D 63 they also depressed the concentrations and total amounts of P in tops and whole plants but increased them in roots. Thus Zn deficiency markedly enhanced P absorption by roots, transport to tops, and accumulation in leaves. Concentrations of magnesium in plant organs responded to treatments in the same way as did P but to a smaller degree, particularly in the leaves. No other element measured (Ca, K, Na, Fe, Cu, Mn) responded in the same way. The development and intensity of symptoms in old leaves correlated closely with P concentrations. Leaves with faint symptoms had 0.8% P; those with marked symptoms had > 1.5% P; and dead leaves had nearly 5% P. The intensification of symptoms is attributed to accumulation of P to toxic levels in leaves. It is suggested that Zn deficiency interferes with P metabolism enhancing the amounts of P absorbed by roots and transported to tops: under conditions of high P supply, P accumulates to toxic levels in leaves inducing or accentuating symptoms resembling Zn deficiency. This effect of Zn on P metabolism in roots seems to explain previously puzzling observations in which P treatments enhanced symptoms of Zn deficiency without any reduction in Zn contents of plant tops: there is no need to invoke any effect of P in inactivating Zn in leaves.","claims":[{"public_id":"cl_b388369062f9c18bc633a95f5a9be54f","status":"active","text":"Increasing phosphorus supply induced mottle leaf symptoms, and these symptoms were eliminated by adding zinc.","confidence":0.96,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_b388369062f9c18bc633a95f5a9be54f"},{"public_id":"cl_bf2c224f2dcb5c12bd0f4cb8f4a97c37","status":"active","text":"Leaf symptom severity correlated closely with leaf phosphorus concentration, with faint symptoms at 0.8% phosphorus, marked symptoms above 1.5%, and dead leaves near 5%.","confidence":0.99,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_bf2c224f2dcb5c12bd0f4cb8f4a97c37"},{"public_id":"cl_776fc566390cd8a53965fa41213d9f91","status":"active","text":"Zinc deficiency interferes with phosphorus metabolism in roots, providing an explanation for phosphorus treatments intensifying zinc-deficiency-like symptoms without lowering zinc content in plant tops.","confidence":0.92,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_776fc566390cd8a53965fa41213d9f91"},{"public_id":"cl_7c0bd4bc1d1a5749a4a3a77194ff6d7b","status":"active","text":"Zinc deficiency markedly enhanced phosphorus absorption by roots, transport to tops, and accumulation in leaves of okra.","confidence":0.98,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_7c0bd4bc1d1a5749a4a3a77194ff6d7b"}],"concepts":[{"public_id":"co_2334f7a2047d373b85c15566bc7e7d5a","status":"active","name":"phosphorus absorption","description":"Uptake of phosphorus by roots from the nutrient solution.","types":["process"],"aliases":["P absorption"],"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/concepts/co_2334f7a2047d373b85c15566bc7e7d5a"},{"public_id":"co_333979699f72eb5934d02a9acc8d9fc7","status":"active","name":"plant tops","description":"The aboveground shoot portion of the plant, excluding roots and fruits.","types":["plant 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