{"title":"向日葵和大豆对轻度水分胁迫的光合响应比较","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":"{\"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}","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}
Comparisons of Photosynthetic Responses of Sunflower and Soybean to Mild Water Stress
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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