{"title":"Effect of Phloem Interruption on Endopeptidase and Aminopeptidase Activities in Flag Leaves of Field-grown Wheat","authors":"Viktor Fröhlich , Urs Feller","doi":"10.1016/S0015-3796(11)80253-2","DOIUrl":"10.1016/S0015-3796(11)80253-2","url":null,"abstract":"<div><p>Leaf senescence and nitrogen remobilization in field grown wheat can be affected by steamgirdling (phloem interruption). The peduncle (below the ear) or the base of the flag leaf was steamgirdled 1 or 10d after anthesis. Protein contents, free amino acids and peptide hydrolase activities were analyzed throughout the maturing period in extracts of the flag leaf lamina from treated plants and untreated controls. Phloem interruption at the leaf base initiated a rapid net degradation of proteins and an accumulation of free amino acids (mainly glutamine and proline). Azocaseinase activity at <em>p</em>H 5.0 increased during the first week after this treatment and declined afterwards, while the activity at <em>p</em>H 9.0 peaked late during senescence when most of the leaf proteins were already hydrolyzed. Aminopeptidase activities (measured with 8 different substrates) remained at the original level for about one week before they decreased. From this time course it appears possible that aminopeptidases contributed to the complete degradation of leaf proteins. Steam-girdling below the ear slightly delayed the remobilization of proteins in the flag leaf lamina, the increase in endopeptidase and the decrease in aminopeptidase activities. The contents of free amino acids remained higher than in untreated controls. The catabolism of leaf proteins and the pattern of peptide hydrolases were differently influenced by the two treatments.</p></div>","PeriodicalId":8798,"journal":{"name":"Biochemie und Physiologie der Pflanzen","volume":"188 1","pages":"Pages 13-21"},"PeriodicalIF":0.0,"publicationDate":"1992-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0015-3796(11)80253-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77914710","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":"Downy Mildew of Pearl Millet: I. Leaf Diffusive Resistance and Transpiration","authors":"Arvind Kumar , H.N. Gour","doi":"10.1016/S0015-3796(11)80258-1","DOIUrl":"10.1016/S0015-3796(11)80258-1","url":null,"abstract":"<div><p>Downy mildew infections induced stomata] closure in pearl millet. Diffusive resistance of adaxial and abaxial foliar surfaces and leaf diffusive resistance of downy mildew infected pearl millet plants were significantly higher than those of healthy plants. Significant decrease in rate of transpiration and water output were also observed in pearl millet on account of downy mildew infections.</p></div>","PeriodicalId":8798,"journal":{"name":"Biochemie und Physiologie der Pflanzen","volume":"188 1","pages":"Pages 39-43"},"PeriodicalIF":0.0,"publicationDate":"1992-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0015-3796(11)80258-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86234603","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":"","authors":"P. Apel","doi":"10.1016/S0015-3796(11)80273-8","DOIUrl":"https://doi.org/10.1016/S0015-3796(11)80273-8","url":null,"abstract":"","PeriodicalId":8798,"journal":{"name":"Biochemie und Physiologie der Pflanzen","volume":"188 1","pages":"Page 77"},"PeriodicalIF":0.0,"publicationDate":"1992-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0015-3796(11)80273-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137362077","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":"","authors":"A. Barner","doi":"10.1016/S0015-3796(11)80259-3","DOIUrl":"10.1016/S0015-3796(11)80259-3","url":null,"abstract":"","PeriodicalId":8798,"journal":{"name":"Biochemie und Physiologie der Pflanzen","volume":"188 1","pages":"Page 44"},"PeriodicalIF":0.0,"publicationDate":"1992-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0015-3796(11)80259-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83168319","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":"Sachwortverzeichnis — Key Term Index","authors":"","doi":"10.1016/S0015-3796(11)80250-7","DOIUrl":"https://doi.org/10.1016/S0015-3796(11)80250-7","url":null,"abstract":"","PeriodicalId":8798,"journal":{"name":"Biochemie und Physiologie der Pflanzen","volume":"188 1","pages":"Pages XI-XIV"},"PeriodicalIF":0.0,"publicationDate":"1992-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0015-3796(11)80250-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91990166","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":"","authors":"A. Meister","doi":"10.1016/S0015-3796(11)80274-X","DOIUrl":"10.1016/S0015-3796(11)80274-X","url":null,"abstract":"","PeriodicalId":8798,"journal":{"name":"Biochemie und Physiologie der Pflanzen","volume":"188 1","pages":"Pages 77-78"},"PeriodicalIF":0.0,"publicationDate":"1992-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0015-3796(11)80274-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75832206","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":"","authors":"P. Apel","doi":"10.1016/S0015-3796(11)80270-2","DOIUrl":"https://doi.org/10.1016/S0015-3796(11)80270-2","url":null,"abstract":"","PeriodicalId":8798,"journal":{"name":"Biochemie und Physiologie der Pflanzen","volume":"188 1","pages":"Page 75"},"PeriodicalIF":0.0,"publicationDate":"1992-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0015-3796(11)80270-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137362065","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":"Buchbesprechungen — Book Reviews","authors":"","doi":"10.1016/S0015-3796(11)80247-7","DOIUrl":"https://doi.org/10.1016/S0015-3796(11)80247-7","url":null,"abstract":"","PeriodicalId":8798,"journal":{"name":"Biochemie und Physiologie der Pflanzen","volume":"188 1","pages":"Pages VI-VII"},"PeriodicalIF":0.0,"publicationDate":"1992-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0015-3796(11)80247-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137363000","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}
AnnaMaria Ranier , Mauro Durante , Armando Volterrani , Giacomo Lorenzini , Gian Franco Soldatini
{"title":"Effects of Low SO2 Levels on Superoxide Dismutase and Peroxidase Isoenzymes in Two Different Wheat Cultivars","authors":"AnnaMaria Ranier , Mauro Durante , Armando Volterrani , Giacomo Lorenzini , Gian Franco Soldatini","doi":"10.1016/S0015-3796(11)80265-9","DOIUrl":"10.1016/S0015-3796(11)80265-9","url":null,"abstract":"<div><p>The isoenzyme patterns of peroxidase (POD) and superoxide dismutase (SOD) were studied in the leaves of two different cultivars of wheat (<em>Triticum aestivum</em> cv. Chiarano and Mec) exposed to low concentrations of SO<sub>2</sub> (35, 75, 120 nl 1<sup>-1</sup>). After the SO<sub>2</sub> treatments quantitative differences in the profile of the peroxidase bands were found, but no new isoforms were detected. An increase in the isoforms showing SOD activity was seen, this effect being more pronounced in cv. Chiarano than in cv. Mec. Our data show that the two wheat cultivars differ in their susceptibility to SO<sub>2</sub> pollution, cv. Chiarano exhibiting a higher resistance.</p></div>","PeriodicalId":8798,"journal":{"name":"Biochemie und Physiologie der Pflanzen","volume":"188 1","pages":"Pages 67-71"},"PeriodicalIF":0.0,"publicationDate":"1992-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0015-3796(11)80265-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81480028","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":"","authors":"R. Braun","doi":"10.1016/S0015-3796(11)80271-4","DOIUrl":"10.1016/S0015-3796(11)80271-4","url":null,"abstract":"","PeriodicalId":8798,"journal":{"name":"Biochemie und Physiologie der Pflanzen","volume":"188 1","pages":"Page 76"},"PeriodicalIF":0.0,"publicationDate":"1992-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0015-3796(11)80271-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88977624","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}