Plant Architecture and Leaf Damage in Bear Oak. I: Physiological Responses

Vanderklein, Dirk W.; Wilkens, Richard T.; Cartier, Anna; Lemke II, Richard W.
September 2004
Northeastern Naturalist;2004, Vol. 11 Issue 3, p343
Academic Journal
Bear Oak (Quercus ilicifolia Wang.) presents a unique architecture in which there is a distinct outer set of leaves on the perimeter of the bush and another set of leaves on the inside. In this paper we examine the relationship between plant architecture, leaf-level physiology, and leaf damage patterns by insects. We measured net photosynthesis, stomatal conductance, and leaf water potential in response to different levels of herbivory or leaf-rolling in both outer- and inner-canopy leaves. Leaf-rolling occurred naturally and was mimicked by hand-rolling leaves to different degrees. Net photosynthesis, stomatal conductance, and leaf water potential varied depending upon a combination of leaf position in the crown and degree of rolling, but not herbivory. Outer-canopy leaves had significantly higher rates of net photosynthesis and stomatal conductance, but lower leaf water potentials and leaf areas than inner-canopy leaves. Leaf rolling had an effect upon photosynthesis and stomatal conductance, which varied depending on whether projected areas of rolled leaves or projected areas of the leaves after they had been unrolled were considered. In both canopy layers, using unrolled projected leaf areas, stomatal conductance and net photosynthesis decreased with increasing leaf rolling. In the outer canopy, using projected areas of rolled leaves, photosynthesis decreased while stomatal conductance increased with increasing leaf rolling. In the inner canopy, photosynthesis increased while stomatal conductance was unchanged with increasing leaf rolling. In all cases, leaf water potential increased with increasing leaf rolling. These results suggest (in order of likelihood) that either rolling creates an area of closed stomata (stomatal patchiness) proportional to the amount of rolling, or leaf specific hydraulic conductance increases, or stomata are responding to changes in the boundary layer of the leaf.


Related Articles

  • THE EFFECT OF THE DENSITY OF STUMP SHOOTS ON PHOTOSYNTHETIC ACTIVITY OF LEAVES. Vardanyan, Z. S.; Arevshatyan, S. H. // Electronic Journal of Natural Sciences;Jul2008, Vol. 11 Issue 2, p35 

    Shoots growing on chaotically felled areas of Lori marz undergo photosynthetic changes. When regulating the amount of shoots, one can control relations between leaf chlorophyll and actions of photosynthetic apparatus of shoots.

  • Mechanisms for Leaf Control of Gas Exchange. Mansfield, T. A.; Davies, W. J. // BioScience;Mar1985, Vol. 35 Issue 3, p158 

    Several mechanisms enable leaf stomata to optimize water loss with respect to carbon gain. Stomatal responses to environmental variation constitute a plant's first and second lines of defense against damaging water deficits. Changes in the concentrations of endogenous growth regulators and their...

  • Developmental mechanism and distribution pattern of stomatal clusters in Cinnamomum camphora. Zhao, X.; Dai, X.; Wang, G.; Shen, Z.; Zhang, H.; Qiu, M. // Russian Journal of Plant Physiology;May2006, Vol. 53 Issue 3, p310 

    We report the stomatal cluster development mechanism and distribution pattern in Cinnamomum camphora. The results indicated that the clustered arrangement of meristemoids at the juvenile stage of the leaf development contributed greatly to the pattern of stomatal clusters. Additionally, division...

  • Physiological consequences of height-related morphological variation in Sequoia sempervirens foliage. Lucy P. Mullin; Stephen C. Sillett; George W. Koch; Kevin P. Tu; Marie E. Antoine // Tree Physiology;Aug2009, Vol. 29 Issue 8, p999 

    This study examined relationships between foliar morphology and gas exchange characteristics as they vary with height within and among crowns of Sequoia sempervirens D. Don trees ranging from 29 to 113 m in height. Shoot mass:area (SMA) ratio increased with height and was less responsive to...

  • Leaf gas exchange in the frankincense tree (Boswellia papyrifera) of African dry woodlands. Mengistu, Tefera; Sterck, Frank J.; Fetene, Masresha; Tadesse, Wubalem; Bongers, Frans // Tree Physiology;Jul2011, Vol. 31 Issue 7, p740 

    A conceptual model was tested for explaining environmental and physiological effects on leaf gas exchange in the deciduous dry tropical woodland tree Boswellia papyrifera (Del.) Hochst. For this species we aimed at (i) understanding diurnal patterns in leaf gas exchange, (ii) exploring...

  • Specification of adaxial and abaxial stomata, epidermal structure and photosynthesis to CO2 enrichment in maize leaves. Driscoll, S. P.; Prins, A.; Olmos, E.; Kunert, K. J.; Foyer, C. H. // Journal of Experimental Botany;Jan2006, Vol. 57 Issue 2, p381 

    Acclimation to CO2 enrichment was studied in maize plants grown to maturity in either 350 or 700 μl l−1 CO2. Plants grown with CO2 enrichment were significantly taller than those grown at 350 μl l−1 CO2 but they had the same number of leaves. High CO2 concentration led to a...

  • Structure and enzyme expression in photosynthetic organs of the atypical C4 grass Arundinella hirta. Wakayama, Masataka; Ohnishi, Jun-ichi; Ueno, Osamu // Planta;Jun2006, Vol. 223 Issue 6, p1243 

    In its leaf blade, Arundinella hirta has unusual Kranz cells that lie distant from the veins (distinctive cells; DCs), in addition to the usual Kranz units composed of concentric layers of mesophyll cells (MCs) and bundle sheath cells (BSCs; usual Kranz cells) surrounding the veins. We examined...

  • Variation of δ13C in Aegiceras corniculatum seedling induced by cadmium application. Lili Wei; Chongling Yan; Guirong Wu; Xiaoyin Guo; Binbin Ye // Ecotoxicology;Aug2008, Vol. 17 Issue 6, p480 

    To test whether the values of δ13C in mangrove plants are affected by Cd application, the seedlings of Aegiceras corniculatum, a dominant mangrove species, were cultured in soil supplied with CdCl2 solution at the concentration of 0, 0.5, 2.5, 5, 20, 30 and 50 CdCl2 mg/kg wet soils. Plants...

  • Genotypic difference of potato in carbon budgeting as a mechanism of phosphorus utilization efficiency. Balemi, Tesfaye; Schenk, Manfred K. // Plant & Soil;Sep2009, Vol. 322 Issue 1/2, p91 

    Observed genotypic difference in P utilization efficiency in soil grown potatoes led to the present study to investigate possible mechanisms of P utilization efficiency in potato genotypes grown in nutrient solution under three P regimes (low, medium and high). For all genotypes relative growth...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics