+ Translate

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.

Order PDF Full Text


Not the article you are looking for?
Click here to order the paper you need

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

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:

Other references

Sparatore, Bianca; Melloni, Edon; Patrone, Mauro; Passalacqua, Mario; Pontremoli, Sandro, 1996: A 6 kDa protein homologous to the N-terminus of the HMG1 protein promoting stimulation of murine erythroleukemia cell differentiation. Murine erythroleukemia (MEL) cells, in addition to an mRNA coding for a 30 kDa high mobility group (HMG)-1 protein, contain an mRNA coding for a 6 kDa HMG1 protein having the following structural properties: (1) its primary structure has 90% homol...

Lee Kwang Woo; Lee Soo Hyung; Hong Gi hoon; Oh Jae Ryoung, 1981: Heavy metals in coastal waters near four industrial-complex areas in Korea. Ocean Research 3(2): 87-96

Azekura K.; Miura T.; Ishii T.; Tabuchi S.; Hirano T.; Harada T.; Ishikawa Y.; Shimoyama T.; Uchida Y., 1982: Prognosis of 81 patients treated surgically for n 2 positive gastric cancer. Journal of Japan Society for Cancer Therapy 17(2): 461

Anonymous, 2011: Magma-hydrothermal system interaction inferred from volcanic gas measurements obtained during 23–28 at Meakandake volcano, Hokkaido, Japan. Phreatic eruptions occurred at the Meakandake volcano in 1988, 1996, 1998, 26, and 28. We conducted geochemical surveillance that included measurements of temperature, SO<sub>2</sub> emission rates, and volcanic gas composition from 23...

Branco, Christina, W. C.; De-Assis-Esteves, Francisco; Kozlowsky-Suzuki, Betina, 2000: The zooplankton and other limnological features of a humic coastal lagoon (Lagoa Comprida, Mace, R.J.) in Brazil. Comprida lagoon is a shallow lagoon separated from the sea by a sand barrier. It has a brown-coloured freshwater with a high concentration of humic compounds. Its zooplankton community and limnological features were studied from March 1992 to Dece...

Savadkohi, Shahab; Abouljoud, Marwan, 2011: Outcome With Surgical Repair of Extrahepatic Portal Vein Aneurysms. Extrahepatic portal vein aneurysm is a rare clinical entity. The two most common locations for aneurysmal formation are at the confluence of the superior mesenteric vein (SMV) and the splenic vein, and at main portal vein trunk, just above the SMV...

Max Teplitski; Anita C Wright; Graciela Lorca, 2009: Biological approaches for controlling shellfish-associated pathogens. Current Opinion in Biotechnology 20(2): 185-190

Mendhe, S. N.; Singh, R. P.; Mendhe, S. S., 2001: Effect of sowing time phosphorus and potash on nodulation and root dry matter of Stylosanthes hamata (L.). The effects of four sowing dates (28th June, 13th July, 27th July and 13th August), four levels of phosphorus (0, 25, 50 and 75 kg ha-1) and four levels of potash (0, 60, 120 and 180 kg ha-1) on nodulation behaviour in Stylosanthes hamata were stu...

Zeches, M; Lounkokobi, J; Plat, Rm; Le-Men-Olivier, L., 1984: Alkaloids of Melodinous guillauminii. Phytochemistry 3(1): 171-174

Davidsohn, Israel, 1964: Hepatotoxicity of mercaptopurine. In a study of 49 leukemic patients, jaundice occurred in 16 of 38 who were treated with mercaptopurine (6-mercaptopurine), but only in one of 11 not receiving the drug. In eight patients jaundice cleared up rapidly on cessation of mercaptopurine t...