+ Site Statistics
+ Search Articles
+ 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
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Anatomical observations on the nucellar apex of Welwitschia mirabilis and the chemical composition of the micropylar drop

Anatomical observations on the nucellar apex of Welwitschia mirabilis and the chemical composition of the micropylar drop

Sexual Plant Reproduction 5(4): 275-279

In the young ovule of Welwitschia mirabilis the nucellar apex is dome shaped and starch begins to accumulate near the female gametophyte. With the degeneration of the cells of the nucellar apex, a pollen chamber is formed, which contains the micropylar fluid. Starch storage increases considerably in the upper part of the nucellus. Pollen drop emission is not a rhythmic process, and pollination dose not produce the rapid withdrawal of droplets. The micropylar drop consists almost entirely of sugars, uronic acids and a very small amount of free amino acids and enzymes. The mechanism of micropylar drop secretion and its probable role in the process of pollination is discussed.

(PDF emailed within 1 workday: $29.90)

Accession: 002301254

Download citation: RISBibTeXText

Related references

Welwitschia mirabilis observations on cuticular efficiency a comparative study. Madoqua Series II 3(69-73): 17-25, 1974

Welwitschia mirabilis observations on general habit seed seedling and leaf characteristics. Madoqua 1(54-62): 53-66, 1972

Abnormal morphology of the embryo and seedling of Welwitschia mirabilis, and some observations on seed-associated fungi. South African Journal Of Botany: 2, 338-340, 2008

Welwitschia mirabilis. Introduk t si i a tropicheskikh i subtropicheskikh rasteni i Akademi i a nauk SSSR Glavny i boanicheski i sad otvetstvenny i redaktor N V T Si t sin: 168, 1980

Welwitschia mirabilis. Ber Deutsch Bot Ges 48(5): 143-144, 1930

Welwitschia mirabilis Hooker. Kakteen und andere Sukkulenten: 25 (8) 174-175, 1974

The status of Welwitschia mirabilis. 1970

Welwitschia mirabilis and neoteny. American Journal of Botany 64(7): 916-920, 1977

Distribution of Welwitschia mirabilis. Amer Jour Bot 40(4): 280-285, 1953

Welwitschia mirabilis Hook. fil. Translation, CSIRO, Commonwealth of Australia (10729): 15, 1971

Gum on the leaves of welwitschia mirabilis. Willdenowia 8(1): 41-48, 1977

On embryogenesis of Welwitschia mirabilis. Revue de cytologie et de biologie vegetales: 2 (3 4) 331-333, 1969

Welwitschia mirabilis: CAM or not CAM - what is the answer?. Functional Plant Biology 32(5): 389-395, 2005

Welwitschia mirabilis Welwitschiaceae. Flowering Plants of Africa 57: 2-8, June, 2001

Publications on Welwitschia mirabilis. Namib Bulletin Supplement No 2 to the Transvaal Museum Bulletin: 13-14, 1977