Premium
ULTRASTRUCTURAL COMPARISION OF POLLEN GRAINS FROM 2n, 3n, AND 4n PLANTS OF EUPHORBIA DULCIS
Author(s) -
Murgia M.,
Wilms H. J.,
Cresti and M.
Publication year - 1987
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1987.tb08766.x
Subject(s) - pollen , biology , ploidy , botany , ultrastructure , plastid , chloroplast , genetics , gene
Pollen development in plants with different ploidy levels of Euphorbia dulcis is similar but some ultrastructural differences do occur. In pollen of diploid plants large aggregations of rough endoplasmic reticulum [RER] are attached to the pollen wall near the young generative cell but such aggregations are not present in other karyotypes. Plastids are detected only in young generative cells of triploid plants. In diploid plants the generative cell becomes spindle‐shaped, in triploid and tetraploid plants it remains round during the movement from the pollen wall to the center of the vegetative cell. The intine surrounding the generative cell in 3 n plants is thinner than that found in 2 n and 4 n plants. Pollen grains in tetraploid plants are twice as large as those in diploid plants. Pollen viability is 90% in 2 n plants, but only 10% in 4 n plants.