Myers, C. V., R. C. Anderson, and D. L. Byers (Behavior, Ecology, Evolution, and Systematics Section, 4120 Department of Biological Sciences, Illinois State University, Normal, IL 61790-4120). Influence of shading on the growth and leaf photosynthesis of the invasive non-indigenous plant garlic mustard [Alliaria petiolata (M. Bieb) Cavara and Grande] grown under simulated late-winter to mid-spring conditions. J. Torrey Bot. Soc. 132: 1–10. 2005.—Plasticity in photosynthetic response to varied light conditions likely contributes to the successful spread and domination of eastern deciduous forest ground layers by the invasive, non-indigenous plant species Alliaria petiolata. We examined the effects of growing plants with no shading, or under 30% or 60% black shade cloth on leaf photosynthetic rates, maximum rates of leaf photosynthesis (Amax) and stomatal conductance (gSmax), light compensation point, above and below ground biomass, chlorophyll content and specific leaf mass of A. petiolata grown under simulated late-winter to mid-spring conditions of temperature, photoperiod, and irradiance in a growth chamber. The 0% shade treatment plants exhibited a significantly greater leaf photosynthetic rate than the 60% shade treatment plants between 800 and 1600 μmol·m−2·s−1 photosynthetically active photon flux density (PPFD). Leaf Amax was significantly greater for plants grown under no shade than for plants grown under either the 30 or 60% shade treatments and gSmax was higher for plants grown under no shade than plants in the 60% shade treatment. Plants grown under 0 and 30% shade produced significantly more biomass and had greater specific leaf mass than plants grown under 60% shade. Leaves of the 60% shade treatment had significantly greater chlorophyll a and b content than leaves of the 0 and 30% shade treatments. Our results indicate that A. petiolata displays a plastic response to varied light levels in a way that would likely increase its success in invading eastern deciduous forest ground layers.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 132 • No. 1