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The anatropous ovule type is the most common in the angiosperms and is
presumed to be ancestral for the group. An orthotropous ovule is one in which no
curvature takes place during development; the micropyle is positioned opposite
the ...
2
Text Book of Botany: Angiosperms
26 ] Megasporogenesis and Female Gametophyte of ovules: A. Atropous, B.
Anatropous, D. Hemi-anatropous; E. Amphitropous, [II] Anatropous ovules In this
type, due to unilateral growth of funicle, the whole body of the ovule is inverted ...
Dr. Singh, Dr. Pande & Dr. Jain
If the ovule is coiled by 360° along its funicle, it is called (1) Orthotropous (2)
Anatropous (3) Circinotropous (4) Hemianatropous 3. An orthotropous ovule is
found in (1) Polygonum (2) Opuntia (3) Pisum (4) Ranunculus 4. The micropyle (1
) ...
4
Paleobotany and the Evolution of Plants
B. Transverse section showing position of attachment of two rows of anatropous
ovules. C. Carpel opened out to show placentation of ovules, glandular hairs,
and course of pollen tubes. Extant. (A-C redrawn from Bailey & Swamy. 1951.) ...
Wilson Nichols Stewart, 1993
5
Flower Seeds: Biology and Technology
Ovule types: A - anatropous; B - orthotropous. Integuments ovules are unitegmic (
i.e. have only one integument). The nucellus appears to play a role in nutrient
transfer between the mother plant and the developing embryo sac (Rangan and ...
M. B. McDonald, Francis Y. Kwong, 2005
6
A Text Book Of Practical Botany 2
In this type, the nucellar protuberance is at first in the same line as the axis, but
the rapid growth on one side makes it anatropous. The curvature continues till the
ovule has turned over completely with the micropylar end again pointing upward,
...
Dr. Ashok Bendre & Dr. Ashok Kumar, 2009
7
Seed Science and Technology: Indian Forestry Species
These are known as orthotropous, anatropous, amphitropous, campy lotropous,
hemianatropous and circinotropous ovules (Plate 10, Figures 1-6). In
orthotropous type, the micropyle and the funiculus are in the same line. In
anatropous type ...
8
The Seeds of Dicotyledons
Testa not multiplicative. Tegmen 10-12 cells thick; o.e. with short, unlignified
palisade-cells. (Venkata Rao 1950.) STYLIDIACEAE Ovules anatropous,
unitegmic, tenuinucellate; integument 5-6 cells thick. Seeds small, albuminous,
exarillate.
Edred John Henry Corner, 1976
9
Seed Development and Germination
Generally speaking three types of ovules can be recognized- Anatropous ovules
are the most common ones. In this case the ovule during its development
undergoes a curvature of about l 80°. By this process the nucellus and the
integuments ...
Ovules two (Rhodotypeae) or one (Kerrieae), pendulous or (Kerria) laterally
attached to the middle of the suture, anatropous, epitropous, unitegmic. Fruits
achenes (in Neviusia achenes are drupaceous). Seeds with copious (
Rhodotypos) or ...
