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Matthew Arrington, Mateus S. Pasa, and Todd C. Einhorn

, predictable thinning outcomes can be difficult to achieve in cooler climates. Alternative thinning chemistries are needed. Abscisic acid is a plant hormone associated with abscission and plant dormancy ( Taiz and Zeiger, 2010 ). ABA also regulates stomatal

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Roger Kjelgren, Lixue Wang, and Daryl Joyce

that may have constrained stomatal aperture ( Sanchez-Blanco et al., 2004 ), the overall effect being something of a hysteresis curve for g s versus substrate moisture. Similarly, post rewatering g s in Dianella , at 28% root zone water content

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Joshua Sherman, Richard J. Heerema, Dawn VanLeeuwen, and Rolston St. Hilaire

and fourth leaf nodes and 70% reduction in P n in the fifth node but no difference in stomatal aperture or size compared with controls under microscopic examination. It may be that the leaf stomatal response in trees with optimal Mn (and therefore

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Mengmeng Gu, Curt R. Rom, James A. Robbins, and Derrick M. Oosterhuis

( Martinez et al., 2003 ). Potassium is believed to be involved in maintaining turgor of guard cells and facilitating stomatal aperture ( Taiz and Zeiger, 1998 ). Recovery of g Sws/ww and thus recovery of Pn ws/ww in the second stage ( Fig. 3 ) could be

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Manuel G. Astacio and Marc W. van Iersel

) reported that ABA levels in leaves were inversely related to stomatal aperture but concluded that ABA levels alone are not a great indicator of g S , because only a portion of ABA in the leaves is involved with regulating stomata ( Walton, 1980 ). We found

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Robert C. Ebel, Said Hamido, and Kelly T. Morgan

the apoplast. It is deposited on the exterior of leaves during rain events and it uses its flagella to move through stomatal apertures and into substomatal chambers ( Gottwald and Graham, 1992 ; Koizumi and Kuhara, 1982 ; Stall et al., 1982 ), where

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Feifei Li, Da Zhan, Lixin Xu, Liebao Han, and Xunzhong Zhang

is accompanied by an increase in the IAA content ( Tang and Zheng, 2008 ; Weiler et al., 1981 ). ABA plays a regulatory role in controlling stomatal aperture under heat stress ( Strivastava, 2002 ). Rapid ABA accumulation has been observed when

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Stefania De Pascale, Luisa Dalla Costa, Simona Vallone, Giancarlo Barbieri, and Albino Maggio

transpiration rate increases linearly with stomatal conductance ( g S ) as net CO 2 assimilation does, but the latter saturates at high g S due to enzymatic (rubisco) limitation. It is possible to improve WUE by reducing stomatal density and stomatal aperture

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Majken Pagter, Karen K. Petersen, Fulai Liu, and Christian R. Jensen

water availability perception, root-to-shoot communication regulating stomatal aperture and leaf growth, and altered gene expression in water deficit plants ( Chaves et al., 2003 ; Davies et al., 2005 ; Loewenstein and Pallardy, 2002 ). In cold

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Zhigang Ouyang, Huihui Duan, Lanfang Mi, Wei Hu, Jianmei Chen, Xingtao Li, and Balian Zhong

thaliana Nucleic Acids Res. 30 623 635 Lugassi, N. Kelly, G. Fidel, L. Yaniv, Y. Attia, Z. Levi, A. Alchanatis, V. Moshelion, M. Raveh, E. Carmi, N. Granot, D. 2015 Expression of Arabidopsis hexokinase in citrus guard cells controls stomatal aperture and