EurekaMag.com logo
+ Site Statistics
30,358,017
Abstracts:
11,218,248
PDF Full Text:
1,187,972
+ Resolve Accession
+ Subscribe to Site Feeds

EurekaMag Most Shared ContentMost Shared

EurekaMag PDF Full Text ContentPDF Full Text

+ PDF Full Text

Request PDF Full TextRequest PDF Full Text

Submit PDF Full TextSubmit PDF Full Text

+ Follow Us

Follow on FacebookFollow on Facebook

Follow on TwitterFollow on Twitter

Follow on Google+Follow on Google+

Follow on LinkedInFollow on LinkedIn

Follow on TumblrFollow on Tumblr

+ Translate

翻译

Attributes of individual flowers of Brassica napus L. are affected by defoliation but not by intraspecific competition


, : Attributes of individual flowers of Brassica napus L. are affected by defoliation but not by intraspecific competition. Annals of Botany 88(1): 111-117

To investigate the effect of intraspecific competition on flowering in Brassica napus'Westar , a series of 30 pots was established that spanned a range of one-96 plants per pot. In each pot, the following attributes of individual flowers were quantified: petal length; petal width; stamen length; pistil length; pollen production; diameter of pollen grains; and nectar production. Certain plants contained a transgenic marker that enabled the vigour of their pollen to be quantified by screening the progeny from post-pollination trials against conventional male competitors. Plant size was strongly affected by plant density; plants in the lowest density pots comprised ten-times more dry biomass than individuals in the highest density pots. However, none of the attributes of individual flowers varied with density. In contrast, the number of flowers per plant declined rapidly with density. In the face of resource scarcity, the plants apparently conserved flower size rather than flower number. There was no difference in the response to density between transgenic and conventional plants, but transgenic plants obtained more fertilizations than expected in post-pollination competition against conventional competitors. A separate experiment demonstrated that B. napus is, nevertheless, capable of plasticity in certain flower attributes (petal size, stamen length) in response to defoliation. Explanations for the stability of flower size relative to flower number are discussed. Copyright 2001 Annals of Botany Company.

Accession: 003655375

PDF Full Text: Attributes of individual flowers of Brassica napus L. are affected by defoliation but not by intraspecific competition



Submit PDF Full Text

No spam - Every submission is manually reviewed

Select a PDF file:

Close Close

Other references

Verghelet, A; Ungureanu, I; Urecheatu, M., 1979, Revista padurilor industria lemnului celuloza si hirtie silvicultura si exploatarea padurilor 94(4): 213-216

Neftel, A.; Blatter, A.; Gut, A.; Hogger, D.; Meixner, F.; Ammann, C.; Nathaus, F. J., 1998: A new approach is presented for a continuous determination of NH3 concentration in the open pore space of the soil and on the soil surface. In a semi-permeable membrane of 0.5 m length a flow of 0.5 s1pm was maintained. In the tube the NH3 concentration adjusted itself to the surrounding air concentration by diffusion through the membrane. Conti...

Buchanan, T. S., 1995: The specific tension of muscle (or maximum muscle stress) is the maximum force developed per unit cross-sectional area and is a frequently used parameter by investigators estimating muscle force. Generally, it is assumed to be a constant value for all muscles and, when multiplied by a muscle's cross-sectional area, is used to provide a meas...

Brandt P., 1981: Three particle-fractions with photosynthetic activity were isolated from E. gracilis and characterized: P2 (chl a : chl b = 2.4; average particle-diameter 200 nm) and P3 (chl a : chl b = 3.8; average particle-diameter, 100 nm) have PS [photosystem] II-activity and P4 (chl a : chl b = 8.2; average particle-diameter, 50 nm) has PS I-activity. Duri...

Ansaldi N.; Santini B.; Robazza P.V.; Ciervo T., 1989, Rivista Della Societa Italiana Di Scienza Dell'Alimentazione. 18(1): 49-52

Morris, A., 1986, Kingbird, 361: 3-5

Lee YoungEun; Yang IlSun; Cha Jin A., 2002: The purpose of this study was to investigate the importance and categorization of task elements of school food service dietician, and to provide useful data for standard model of dietitian's tasks in school food service. This study was conducted in school food services nationwide [Korea Republic]. Questionnaires were mailed to the dietitian...

Anonymous, 2012: TNF? is a pleiotropic cytokine that signals for both survival and apoptotic cell fates. It is still unclear that the dual role of TNF? can be regulated in cancer cells. We previously described an apoptotic pathway involving p53?CDIP?TNF? that was activated in response to genotoxic stress. This pathway operated in the presence of JNK activation;...

Fauquette S.; Quezel P.; Guiot J.; Suc J. P., 1998: The climatic reconstruction of the Pliocene, based on pollen data, requires a new method of quantification because of the presence in pollen spectra, of temperate, warm-temperate but also subtropical plants. As no modern pollen spectra contain all these taxa, the best analogues method is inappropriate for this period. So, a new method is propose...

Fredj, G., 1983, Rapports et Proces-Verbaux des Reunions Commission Internationale pour l'Exploration Scientifique de la Mer Mediterranee Monaco, 283: 311-312