{"title":"Comparisons of Photosynthetic Responses of Sunflower and Soybean to Mild Water Stress","authors":"Gian Franco Soldatini , Lucia Guidi","doi":"10.1016/S0015-3796(11)80127-7","DOIUrl":null,"url":null,"abstract":"<div><p>The Effect Of Mild Water Stress (−0.5 Mpa Water Potential) On The Rate Of Photosynthesis And Related Parameters In Sunflower And Soybean Plants Was Studied. The Two Species Responded Very Differently: (a) soybean showed a very rapid and marked response which was accompanied by changes in all of the parameters related to photosynthesis and water balance, while the response of sunflower was much more slow; (b) both soybean and sunflower recovered slowly from the stress when rewatered, and the recovery was not complete, reaching values in the range of 50 to 65% compared to the control for CO<sub>2</sub> assimilation, the transpiration rate and stomatal conductance. The results when analysed in terms of the c<sub>i</sub>/c<sub>a</sub> ratio confirmed the hypothesis that under mild water stress, the reduction in photosynthesis seen is mainly due to the limitation by the stomata of the amount of available CO<sub>2</sub>.</p></div>","PeriodicalId":8798,"journal":{"name":"Biochemie und Physiologie der Pflanzen","volume":"188 5","pages":"Pages 321-331"},"PeriodicalIF":0.0000,"publicationDate":"1992-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0015-3796(11)80127-7","citationCount":"11","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Biochemie und Physiologie der Pflanzen","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0015379611801277","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 11
Abstract
The Effect Of Mild Water Stress (−0.5 Mpa Water Potential) On The Rate Of Photosynthesis And Related Parameters In Sunflower And Soybean Plants Was Studied. The Two Species Responded Very Differently: (a) soybean showed a very rapid and marked response which was accompanied by changes in all of the parameters related to photosynthesis and water balance, while the response of sunflower was much more slow; (b) both soybean and sunflower recovered slowly from the stress when rewatered, and the recovery was not complete, reaching values in the range of 50 to 65% compared to the control for CO2 assimilation, the transpiration rate and stomatal conductance. The results when analysed in terms of the ci/ca ratio confirmed the hypothesis that under mild water stress, the reduction in photosynthesis seen is mainly due to the limitation by the stomata of the amount of available CO2.
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