{"title":"Effects of different defoliants on defoliation and changes of hormone content in apple leaves","authors":"Gongshuai Wang, Jinhui Lv, Susu Zhang, Yu Mei, Guodong Li, Wensheng Gao, Qin Xu","doi":"10.48130/ph-0025-0026","DOIUrl":"https://doi.org/10.48130/ph-0025-0026","url":null,"abstract":"The main purpose of this study is to combine and synthesize the defoliant with the best effect on apple leaves, and study the defoliant and its effect on the change of plant hormone content in leaves. Taking Yanfu 10 as the experimental material, the response surface methodology was used to optimize the concentration of urea, potassium iodide, and trichloroacetic acid to make nine single-factor treatments, and 17 orthogonal treatments, and Yanfu 10 was sprayed on the leaves. The effects of different defoliants on defoliation, and the changes of phytohormone content in its apple leaves were studied. The results showed that the defoliant rate of each treatment was significantly higher than CK treatment, and the compound defoliant treatment of 5% urea, 0.3% potassium iodide, and 1 g·L<sup>−1</sup> trichloroacetic acid performed best after spraying for 10 d, defoliation rate is 57%. The content of hormones in leaves of orthogonal optimal treatment (R), and optimized model prediction optimal treatment (T: 4.75% urea, 0.34% potassium iodide, and 1.21 g·L<sup>−1</sup> trichloroacetic acid, defoliation rate is 70.91%) was detected. It was found that the contents of abscisic acid, jasmonic acid, and salicylic acid in leaves increased significantly by 46.65%, 82.15%, and 82.35% compared with CK treatment. The compound defoliant of 4.75% urea, 0.34% potassium iodide, and 1.21 g·L<sup>−1</sup> trichloroacetic acid is the best defoliant formula.","PeriodicalId":102417,"journal":{"name":"Chemistry of Plant Hormones","volume":"1 1","pages":"0-0"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.maxapress.com/data/article/opr/preview/pdf/ph-0025-0026.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147896116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Gibberellins","authors":"Nobutaka Takahashi, I. Yamaguchi, Hisakazu Yamane","doi":"10.1201/9781315139241-3","DOIUrl":"https://doi.org/10.1201/9781315139241-3","url":null,"abstract":"This volume comprises the text of the 39 lectures presented at 'The Gibberelhn Symposium Tokyo 1989', which was held to mark the fiftieth anniversary of the isolation of gibberelhc acid in 1938 in the University of Tokyo As much of our present understanding of gibberellins has resulted from research with seeds (19 of the chapters are wholly or partly concerned with seeds), it is appropriate to review this publication here, concentrating on its relevance to seed science The discovery of gibberellins received little attention outside Japan for quite a long time, partly as a result of World War II and what was effectively intellectual isolation of Japanese science For example, the present reviewer was able to complete his formal education in 1954 in total ignorance of the existence of gibberellins, and, furthermore, the Annual Review of Plant Physiology has no indexed mention of them until 1957, when Bruce Stowe and Toshio Yamaki reviewed 'The history and physiological action of the gibberellins' The elucidation of the chemistry of the gibberellins has become one of the most distinguished areas of research into natural products, and of particular merit has been the development of rigorous physical methods for the study of gibberelhn chemistry and the accurate determination of minute amounts of gibberellins in plant tissues Some of those who pioneered this work continue to be active scientists, several of whom have written chapters placed early in the book","PeriodicalId":102417,"journal":{"name":"Chemistry of Plant Hormones","volume":"301 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114585555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Cytokinins","authors":"K. Koshimizu, H. Iwamura","doi":"10.1201/9781315139241-4","DOIUrl":"https://doi.org/10.1201/9781315139241-4","url":null,"abstract":"","PeriodicalId":102417,"journal":{"name":"Chemistry of Plant Hormones","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114218074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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