Stomatal behavior of potatoes under nonlimiting soil water conditions |
| |
Authors: | J C Stark |
| |
Institution: | 1. Dept. of Plant, Soil and Entomological Sciences, University of Idaho Research and Extension Center, 83210, Aberdeen, Idaho
|
| |
Abstract: | Field studies were conducted to examine the relative effects of net irradiance (Rn), air vapor pressure deficit (VPD) and leaf water potential (Ψ1), on leaf conductance, (C1) of well-watered potatoes. Conductances of sunlit, surface-layer leaves for the cultivars Russet Burbank, Kennebec and Lemhi Russet were positively correlated with Rn (r2=0.79, 0.83 and 0.62, respectively) for Rn between 100 and 650 Wm-2. Leaf conductance (cm s-1) for all three cultivars was described by the linear relation: C1=0.871 +0.0028 Rn (r2=0.73). Mean C1 for a full Russet Burbank canopy, comprised of measurements from both sunlit and shaded leaves, was also linearly related to Rn. Although VPD and Ψ1 were significantly correlated with C1 (r2=0.44 and 0.46, respectively), the results of multiple regression analysis showed that they had no additional effect on C1 beyond that attributed to Rn. These results indicate that potato leaf conductance is primarily related to irradiance under nonlimiting soil water conditions. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|