ISSN:
1432-2242
Schlagwort(e):
Pollen plants
;
Chromosome counts
;
Callus formation
;
Embryoid formation
;
Plant regeneration
;
Rubber-tree
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
Notizen:
Summary The yield of pollen embryoids from cultured Hevea anthers was increased 4 fold by optimizing the proportion of ammonium nitrate to potassium nitrate in the dedifferentiation medium. For optimal differentiation of pollen embryoids, kinetin, 2,4-D and α-naphtalene acetic acid are required. Anther culture for 50 days on the dedifferentiation medium is a prerequisite for the selective development of calli and embryoids from microspores. The determination of chromosome numbers in embryoids, plantlets and regenerated trees reveals that they originate from (poly)haploid pollen grains (n=2x=18). Aneuploid, triploid (3x=27) and tetraploid (4x=36) cells were encountered in increasing frequencies as the embryoids and plants developed. A few haploid cells with 9 chromosomes were consistently observed. Buds from shoots with mixoploid chromosome numbers can be grafted and the change in the chromosome constitution of the developing new shoots followed.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00293340
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