You are not currently logged in.
Access JSTOR through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Variation in Flowering Size and Age of a Facultative Biennial, Aster Kantoensis (Compositae), in Response to Nutrient Availability
Mitsuko Kagaya, Takashi Tani and Naoki Kachi
American Journal of Botany
Vol. 96, No. 10 (Oct., 2009), pp. 1808-1813
Published by: Botanical Society of America, Inc.
Stable URL: http://www.jstor.org/stable/27733519
Page Count: 6
You can always find the topics here!Topics: Flowering, Nutrient nutrient interactions, Plants, Biennials, Plant growth, Phenotypic plasticity, Population size, Species, Genetic variation, Nutrient availability
Were these topics helpful?See somethings inaccurate? Let us know!
Select the topics that are inaccurate.
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
Although the flowering of facultative biennials is size-dependent, flowering size varies markedly within a single population as well as among populations. In this study, 15 half-sib families of the facultative biennial Aster kantoensis were grown from seeds at three nutrient levels (low, medium, and high). A significant nutrient × family interaction effect was found for bolting size, and among-family variation in bolting size increased with decreasing nutrient level. Growth from bolting to flowering tended to be greatest at the high nutrient level. Such responses of bolting size and growth from bolting to flowering resulted in an increase in flowering size at the high nutrient level and a significant variation in its reaction norm among families. For flowering age, there was a significant interaction of nutrient × family, and its among-family variation increased with decreasing nutrient levels, as was the case with bolting size. These results indicate that genetic variation in phenotypic plasticity of bolting size with nutrient availability was one cause of the variation in flowering size and age in the A. kantoensis population on the floodplain with the spatially heterogeneous nutrient availability. Moreover, responses of growth from bolting to flowering to nutrient availability could enhance the variation in flowering size.
American Journal of Botany © 2009 Botanical Society of America, Inc.