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您的检索式：作者名="David Jespersen"
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| 1 | Towards estimating shade response of bermudagrass(Cynodon spp.)using field-based photosynthetic properties显示文摘Shade tolerance is a highly desirable trait when breeding new bermudagrass(Cynodon spp.)lines,but current screening methods can take many years to complete.There is a clear need for large-scale turfgrass breeding programs to reliably,accurately,and quickly predict shade tolerance in their germplasm.The objectives of this research were to:(i)build custom chambers to reproducibly estimate photosynthetic characteristics from turfgrass canopies at different light intensities and(ii)determine which photosynthetic characteristics are indicative of past shade performance.A custom-built chamber was constructed to determine average photosynthetic characteristics for the whole plant by studying the turfgrass canopy at natural leaf angles for light interception.Shade tolerant(11-T-56)and shade sensitive(Tifway)bermudagrass cultivars were used to examine the effectiveness of the chamber within an array of photosynthetic characteristics when the grasses were grown in full-sun and 73%shade environments.Light compensation point,chlorophyll content,quantum yield,dark respiration rate,and maximum quantum yield of photosystem II were evaluated in this trial.Based on the results of this study,the authors recommend that light compensation point or maximum quantum yield be further evaluated as an accurate indicator of shade tolerance when performed in the field on spring days with grasses grown in full sun or 73%shade environments.Lower Rd rates and ambient temperatures on spring days appear to minimize unexplained variance in the data,which would allow researchers to better detect genotypic differences during this season. | Jonathon L.Fox David Jespersen Lisa L.Baxter John L.Snider Marc W.van Iersel Brian M.Schwartz | 2022 | Grass Research2022，2，1： | 0 |
| 2 | 仍在衰退的阴霾中挣扎显示文摘股票市场形势一片大好。企业盈利超过了华尔街的预期。而且,两年多来,看好标准普尔500指数公司业绩预期的分析师人数首次超过了看淡者的人数。听着这满天飞的好消息,你也许会认为笼罩在经济上空的阴霾终于要消散了,管理层正在为企业的再次增长指示方向。 | 克里斯托弗·帕尔默里(Christopher Palmeri) 唐纳·麦格雷戈(Jena McGregor) 戴维·亨利(David Henry) 弗雷德·杰斯帕森(Fred Jespersen) 约瑟夫·韦伯(Joseph Weber) 田乐乐(译) | 2009 | 商业周刊(中文版)2009，，9： | 0 |
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