The pollen grain is the carrier of the male gametes or their progenitor cell, in higher plants. In a single unit, each grain contains all the genetic information required to specify an entire haploid plant organism (for example, pollen embryoids in tissue culture), or to unite with the fema...
Pollen grain of Capsella is View Solution Select the correct combination of true and false for the given statements about pollen grain cells. (1) The vegetative cell has an abundant food reserve. (2) The vegetative cell has large irregularly shaped nucleus. ...
<p><strong>Step-by-Step Solution:</strong></p><p>1. <strong>Understanding Pollen Grain Structure</strong>: - Pollen grains consist of two main layers: the outer layer called the exine and the inner layer known as the intine.</p><p>2. <strong>Identify
Pollen grains of Lycopersicon esculentum, a species not previously investigated in similar studies, were used to determine whether the routes of passage through the pollen wall are a characteristic of a given species. We found lanthanum deposits on the cell wall surface, inside microchannels crossing...
Germinal pore number in pollen grains as a selection basis in the production of tetraplois clover | Clc J Dijkstra,GJ Speckmann 被引量: 11发表: 1965年 Breeding system evolution in Tarasa (Malvaceae) and selection for reduced pollen grain size in the polyploid species The harsh environment of ...
FRENGUELLI, G., FERRANTI, F., TEDESCHINI, E., ANDREUTTI, R., 1997: Volume changes in the pollen grain of Corylus avellana L. (Corylaceae) during development. Grana 36, 289-292.Frenguelli, G., Tedeschini, E., Andreutti, R. & Ferranti, F. (1997). Volume changes in the ...
for measurement of pollen length and width. Pollen viability was determined using a staining method (ALEXANDER, 1969). The results showed that species differ by pollen grain shape (round, egg-shaped, triangular and rod) as well as by shape of exine (thick and spiky, thick to thin). In ...
T, tapetum; PMC, pollen mother cell; Tds, tetrad; Msp, microspore; Psm, pseudo-microspore; Dps, degenerating pseudo-microspore; PG: pollen grain; Scale bars = 10 μm. Full size image Homologous chromosomal behavior is aberrant in the gametophyte development of the TE5A mutant To more...
pollen stage. Callose wall have degenerated, microspores are released, and their appearance is irregular, with a nucleus located centrally. The cells in the tapetum have begun to degenerate. En, endothecium; Ep, epidermis; ML, middle layer; MMC, microspore mother cell; MT, microspore tetrad;...
Here, we present a new sedimentary record covering the past ~ 8,000 years from Lago di Baratz, north-west Sardinia. Vegetation and fire history are reconstructed by pollen, spores, macrofossils and charcoal analyses and environmental dynamics by high-resolution element geochemistry together with...