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Kenneth R. Schroeder and Dennis P. Stimart

Evaluation of leaf stomatal numbers and postharvest water loss indicate these are important factors in Antirrhinum majus (snapdragon) cut flower postharvest longevity (PHL). Cut flowers with 9 days longer PHL had 53% fewer leaf stomata. Long PHL is associated with an early reduction in transpiration followed by low steady transpiration. Short-lived genotypes had a linear transpiration pattern over the period of PHL indicating poor stomatal control of water loss. Short-lived genotypes had 22% to 33% reductions in fourth quarter transpiration while long-lived genotypes had 2% to 8% reductions. In addition, short-lived genotypes had higher average fourth quarter cut flower weight losses compared to long-lived genotypes. Further investigation of stomatal numbers and functioning relative to PHL may provide breeders a rapid and nondestructive indirect selection method for PHL.

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Thomas O. Athoo, Andreas Winkler and Moritz Knoche

about the mechanisms and pathways of water loss by a cherry fruit’s pedicel ( Linke et al., 2010 ; Smith and Whiting, 2011 ). The role played by the fruit in pedicel transpiration is not clear. Water loss from plant surfaces (including of fruit and

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Mokhles A. Elsysy, Michael V. Mickelbart and Peter M. Hirst

transpire and affect the flow of substances through the xylem stream. In temperate deciduous trees, stomatal density correlates positively with transpiration and photosynthetic potential ( Aasamaa et al., 2001 ; Sack et al., 2003 , 2005 ). Moreover

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Georgene L. Johnson, Thomas R. Sinclair and Kevin Kenworthy

drought tolerance. A high volumetric soil water content at which transpiration rate begins to decrease would be a possible mechanism to conserve soil water and maintain turf quality for a longer time as drought conditions persist. Identification of

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William L. Bauerle and Joseph D. Bowden

control transpiration. At scales larger than the leaf, however, the boundary layer control on transpiration can become more important than genotype-specific stomata expressions. For example, it is commonly accepted that under ventilated conditions at the

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Carl-Otto Ottosen

Abbreviations: C I , internal CO 2 concentration (ppm CO 2 ); G 5 , stomatal conductance (mol·s -1 ·m -2 ); P N , net photosynthetic rate (μmol CO 2 /sec per square meter); T, transpiration rate (μmol H 2 O/sec per square meter). 1 Former Research

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Soo-Hyung Kim, Jig Han Jeong and Lloyd L. Nackley

the canopy level. Leaf physiology models simulating photosynthesis and transpiration are at the core of process-based crop models for accurate predictions of crop biomass accumulation, allocation, and yield formation ( Kim and Lieth, 2003 ; Lizaso et

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Andrew G. Reynolds, Amal Ehtaiwesh and Christiane de Savigny

Anderson, 1988 ; Smart and Coombe, 1983 ), poor fruit composition ( Reynolds et al., 2007 ), decreased vine photosynthesis and transpiration ( Choné et al., 2001 ; Fuller, 1997 ; Gomez-del-Campo et al., 2002 ), and poor shoot growth ( Reynolds and Naylor

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Julie M. Tarara and Jorge E. Perez Peña

.g., Castellarin et al., 2007 ; Intrigliolo et al., 2012 ; Tarara et al., 2011 ). Regulated deficit irrigation affects both net carbon exchange (NCE) and transpiration (Tr), which are coupled processes. The ratio between NCE and Tr is referred to as instantaneous

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Maher Trigui, Laurent Gauthier and Suzelle Barrington

Experiments were conducted in four independently controlled greenhouses. The purpose of these experiments was to measure the effect of humidity on transpiration and yields. Four different humidity treatments were evaluated: 1) high night and high day humidity levels (vapor pressure deficits <0.4 kPa), 2) high night and low day humidity levels (VPD >0.8 kPa), 3) high night and low day humidity levels, and 4) variable greenhouse humidity to maintain a set hourly transpiration rate. Transpiration rates were measured in the four greenhouses at 15-min intervals from Nov. 1993 to May 1994. Results show that high humidity reduces the hourly and daily transpiration levels significantly and has an impact on crop yields. Results also show that it is possible to regulate crop transpiration by calculating the transpiration rate for a set of VPD and solar radiation levels.