Competition/colonization syndrome mediated by early germination in non-dispersing achenes
in the heteromorphic species Crepis sancta.
At the stage of achene
development and filling (21 and 30 DAWDA), the highest level of B favored higher [g.sub.s] in plants under water deficit (Figures 3F and G).
Detection of full samples: Four repetitions of 25 pure seeds (achenes
) per treatment were observed with a stereomicroscope with the help of a sectioned-in-half scalpel, and the presence or absence of seeds inside the achene
was checked (Figure 3B and C).
The upper row enlarged 6 times, the lower row showing the bases of achenes
enlarged 10 times
The flower head having 3-8 unequal rays and the fruit is a three-angled achene
. The weeds cyperaceae family can propagate through rhizome which bears the node and internode and also by seeds.
In other parts of Europe, the achenes
of buckwheat also regularly appear in medieval culture layers (cf.
Treatments###Head diameter (cm)###Number of achenes
per head###1000- achene
weight (g)###Achene yield (kg ha-1)
Besides the intrinsically interesting features of the cypsela (achene
) structure, we sought to contribute to a better understanding of the seed characters of nine Asteraceae species, which occur with relative frequency as weed plants in Brazil.
Succession stage/category Fruit type Specific Seed morphological size, mm adaptation Pioneers Meconopsis racemosa Capsule No adaptation 1-2 The early stage/dominant species Arenaria delavayi Capsule No adaptation Meconopsis horridula Capsule No adaptation Common species Draba oreodoxa Silicle No adaptation 4 Cremanthodium smithianum Achene
Pappus 4 Polygonum macrophyllum Achene
No adaptation 2.5-3 Carex capilliformis Nutlet No adaptation 2 The Middle stage/Dominant species Arenaria delavayi Capsule No adaptation Kobresia fragilis Nutlet No adaptation 2-2.4 Pedicularis rupicola Capsule No adaptation 3 Carex capilliformis Nutlet No adaptation 2 Carex kansuensis Nutlet No adaptation 2 Polygonum macrophyllum Achene
No adaptation 2.5-3 Common species Pedicularis sp.
Buckwheat "seeds" look like cereal grains, but they are actually dry, hard-covered fruits called "achenes
." Each achene
contains one small seed.
Conflictingly days to flowering (64.5), achene
formation (73.73), physiological maturity (95.98), head diameter (19.16 cm), thousand achene
weight (43.53 g) and number of achenes
per head (1138.8) were maximum in 55,555 plants ha-1.
It differs from other strawberry species of the region, having hairs on the upper side of its leaves; a different-shaped middle leaflet; comma-shaped, small brown fruits, achenes
, on the strawberry surface; and 10 sets of chromosomes, unlike the eight sets of chromosomes of the commercial strawberry.