chalazal


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Related to chalazal: Chalazal spot

cha·la·za

 (kə-lā′zə, -lăz′ə)
n. pl. cha·la·zae (-zē) or cha·la·zas
1. Biology One of two spiral bands of tissue in an egg that connect the yolk to the lining membrane at either end of the shell.
2. Botany The region of an ovule that is opposite the micropyle, where the integuments and nucellus are joined.

[Greek khalaza, hard lump, hailstone.]

cha·la′zal adj.
References in periodicals archive ?
The megaspore tetrads are arranged linearly, and the megaspore at the chalazal end is functional.
Occurring at the chalazal end of the ovule there is a cup-shaped region of thick-walled cells (see Figure 4G).
Seed length was measured from hilar to chalazal end; seed width and thicknesses were taken at the mid portion and the widest part, respectively, of the seed.
A testal flange projects at the chalazal end and the seed surface is ornamented by rounded tubercles (visible from photos of the type collection kindly supplied by M.
Se realizo un corte con bisturi en el extremo chalazal bajo microscopio estereoscopico con aumento de 5X (Severin et al.
Seeds 4 per fruit, compressed, more or less cuadrangular in outline with a micropilar neck and a chalazal beak, 9-10 mm long, 5-6 mm wide and 1 mm thick.
0,7 mm wide, flattened, not thickened towards the apex, yellowish; anthers linear, subdorsifixed, slightly sagittate, with a thick green connective and dark brown to blackish thecae, pollen yellow; ovary conical, the lower 1/3 (= nectary tissue) sunk into the receptacle, yellowish, nectary tissue orange, the superior part 7 mm long; ovules white, the flat chalazal appendage about half as long as the ovule proper; style ca.
Changes in chalazal cell walls and in the peroxidase enzymes of the crease region during grain development in barley.
4 68 feed 1155 mama 17 5 112 deers 1446 Malay 13 6 126 booboo 1809 malaya 14 7 180 feeders 2034 layaway 11 8 228 deferred 2247 chalazal 10 9 266 deferrers 2892 Malayalam 11 10 323 feedstuffs 2522 amalgamate 7.
We've all heard of physical dormancy, but the discussion in Chapter 3, along with information in a table and a figure, brings all the information together and helps to explain (and us to remember) differences between strophioles or chalazal plugs.