kialakulÁsa magtÍpusok - eötvös loránd...
TRANSCRIPT
Nyitvatermőkben: a női gametofiton haploid sejtjei képezik a mag tápszövetét: primér
endospermium. Poliambrionalitás: 2 archegonium/magkezdemény, 4 embrió/zigóta, DE!
általában csak egyetlen embrió marad meg.
ZÁRVATERMŐK:
A MAG SZERKEZETE
MAGHÉJ (TESTA)
Védelem az emésztés
ellen, szerep az
elterjesztésben
EMBRIÓ RAKTÁROZÓ-
SZÖVET
SZIKLEVÉL(2n) (BORSÓ, SZÓJA,
BAB)
ENDOSPERMIUM (3n) (PAPRIKA, RICINUS,
DOHÁNY, FŰFÉLÉK)
PERISPERMIUM (2n) (CUKORRÉPA, BORS)
RÜGYECSKE
GYÖKÖCSKE EPIKOTIL
MEZOKOTIL
HIPOKOTIL
http://www.seedbiology.de/structure.asp#structure1
NINCS (ORCHIDEÁK)
The oldest viable carbon-14-dated seed that has grown into a plant was a Judean
date palm seed about 2,000 years old, recovered from excavations at Herod the
Great's palace on Masada in Israel. It was germinated in 2005.[45]
The earliest fossil seeds are around 365 million years old from the Late Devonian
of West Virginia. The seeds are preserved immature ovules of the plant Elkinsia
polymorpha.[47]
The largest seed is produced by the coco de mer, or "double coconut palm",
Lodoicea maldivica. The entire fruit may weigh up to 23 kilograms (50 pounds) and
usually contains a single seed.[46]
The smallest seeds are produced by orchids: their germination is
possible with the help of fungi.
•45 Corner EJH (1966). The Natural History of Palms. Berkeley, CA: University of
California Press. pp. 313–4.
•46Taylor EL, Taylor TMC (1993). The biology and evolution of fossil plants.
Englewood Cliffs, N.J: Prentice Hall. pp. 466. ISBN 0-13-651589-4.
•47 Roach, John. (2005) "2,000-Year-Old Seed Sprouts, Sapling Is Thriving", National
Geographic News, 22 November.
400 - 500 m
A mag, maghéj gyógyászati felhasználása:
A maghéj szőre:
Gyapot: vatta, de allergén is lehet: kanadai nyár
A maghéj:
Lenmag: nyálka – az emésztőrendszert védi
A maghéj belső hártyája:
Tökmagolaj (Peponen), benne protoklorofill – zöld szín DE!
fitoszteroidok a sziklevélben!
Szőlőmag:
Antioxidánsok
Virágkocsány
Terméskocsány
Magkezdemény
Mag
Magház fala
Termésfal
Endocarpium
Mesocarpium
(terméshús)
Exocarpium
(terméshéj)
vacok
Valódi
termés
Termésfal
Módosult
szár,
nyalábokkal
Száraz
csészelevelek
Valódi termés
Áltermés (Accessory fruit)
Magkezdemény
Mag
Virágkocsány
Terméskocsány
GENERAL FRUIT STRUCTURE
http://generalhorticulture.tamu.edu/HORT604/LectureSuppl/AnatomyOrgans
/AnatomyOrgans05.htm
Nix v. Hedden, 148 U.S. 308 (1893)[1], was a case in which the
United States Supreme Court addressed whether a tomato was
classified as a fruit or a vegetable and decided it was a vegetable.
The Tariff Act of March 3, 1883 required a tax to be paid on imported
vegetables, but not fruit. The case was filed as an action by John Nix,
John W. Nix, George W. Nix, and Frank W. Nix against Edward L.
Hedden, Collector of the Port of New York, to recover back duties
paid under protest.
"[the dictionary] does not classify all things there, but they are correct as
far as they go. It does not take all kinds of fruit or vegetables; it takes a
portion of them. I think the words 'fruit' and 'vegetable' have the same
meaning in trade today that they had on March 1, 1883. I understand
that the term 'fruit' is applied in trade only to such plants or parts of
plants as contain the seeds. There are more vegetables than those in
the enumeration given in Webster's Dictionary under the term
'vegetable,' as 'cabbage, cauliflower, turnips, potatoes, peas, beans,
and the like,' probably covered by the words 'and the like.'"
Botanically, a tomato is a fruit because it is a seed-bearing structure growing from the
flowering part of a plant. The court, however, unanimously ruled in favor of the
defendant, that the Tariff Act used the ordinary meaning of the words "fruit" and
"vegetable" – where a tomato is classified as a vegetable – not the technical botanical
meaning.