Germinal pore number in pollen grains as a selection basis in the production of tetraploid clover

Dijkstra, J.; Speckmann, G. J.

doi:10.1007/bf00149507

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…The method for tracing doubled and undoubled plant sectors by the number of pollen grain pores, as described earlier for diploid clover species (DIJKSTRA and SPECKMANN, 1965) can be used in the same way for white clover.…”

Section: Discussionmentioning

confidence: 99%

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Numbers of chloroplasts and pollen grain pores in diploid and tetraploid varieties of some Trifolium species

Najčevska

Speckmann

1968

Euphytica

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In red clover (2n = 14), berseem (2n = 16) and in white clover (2n = 32) the differences in the number of plastids in the leaf stomata and the number of germinal pores in the pollen grains between diploid and induced tetraploid plants was established.In all species the doubling of the chromosomes was followed by an increase in the number of plastids. This increase was about the same in all three species. The number of plastids in the stomata of the amphidiploid white clover was similar to that of the tetraploid types of red clover and berseem.The pollen grains of the diploid plants had almost exclusively three pores. The pollen grains of the chromosome doubled plants had predominantly more than three germinal pores.It was concluded that both characters can serve as useful indicators for establishing the polyploid level in the three clover species studied.

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Section: Discussionmentioning

confidence: 99%

“…FUNKE (1956) was the first to point out the possibility of distinguishing diploid and tetraploid red clover plants by the number of germinal pores in the pollen grains. DIJKSTRA and SPECKMANN (1965) described the results of this method with berseem (Trifolium alexandrinum) .…”

Section: Introductionmentioning

confidence: 99%

Numbers of chloroplasts and pollen grain pores in diploid and tetraploid varieties of some Trifolium species

Najčevska

Speckmann

1968

Euphytica

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“…In the second series of experiments, the growing points of nearly thousand young plants in the 2nd and 3rd leaf stage were treated with a 0.2% colchicine solution for two days, according to DIJKSTRA & SPECKMANN (1965). During the vegetative development of the treated material (C,), mixoploids were selected visually.…”

Section: Materialsandmethodsmentioning

confidence: 99%

Autotetraploidy in caraway (Carum carvi L.) for the increase of the aetheric oil content of the seed

Dijkstra¹,

Speckmann²

1980

Euphytica

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An autotetraploid population of caraway (Carurn carvi L.) was produced by treating the growing points of young plants with a 0.2% colchicine solution. Selection on morphology, pollen size and pollen shape, followed by a selection on seed size proved to be an effective way to identify the mixoploid C, plants. Three percent of the treated plants produced a tetraploid progeny. Moderate selection in the C, and the C, population resulted in an improvement of the average seed-set to the amount of 50% of the diploid control, with a range of 21-78%. The IOOO-kernel weight of the tetraploid material was 7 g, compared to 3 g in the diploid control. The oil content of the autotetraploid seed was increased with 35.6%; the increase in carvone amounted to 6.9%. The results of the experiment indicate that breeding work in autotetraploid caraway may result in a new cultivar.1NTRODUCTlON

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“…The growing point of young seedlings was given a 0.3 ~ colchicine treatment for three days (DIJKSTRA and SPECKMANN, 1965). About 60 7o of the plants survived this treatment.…”

Section: Methodsmentioning

confidence: 99%

An efficient method to separate tetraploid from diploid plants after colchicine treatment of turnips (Brassica campestris var. rapa)

1967

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To obtain a Cl-population with a high percentage of tetraploids after colchicine treatment of turnips, a selection in the C o can be used. A comparison is made between two criteria for this selection, viz. the average pollen grain size and the variation in pollen grain size.C0-selection on the basis of the average pollen grain size of five pollen grains per plant reduced the number of diploids in the C1 considerably. When the variation in pollen grain size of these five pollen grains is included as a selection-criterion the number of tetraploids in the C~ increased.The two methods are discussed in the light of the working efficiency and the genetical variation in the tetraploid C~-population. It is concluded that the character of the initial material should govern the choice of the selection criterion.

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Germinal pore number in pollen grains as a selection basis in the production of tetraploid clover

Cited by 6 publications

References 3 publications

Numbers of chloroplasts and pollen grain pores in diploid and tetraploid varieties of some Trifolium species

Numbers of chloroplasts and pollen grain pores in diploid and tetraploid varieties of some Trifolium species

Autotetraploidy in caraway (Carum carvi L.) for the increase of the aetheric oil content of the seed

An efficient method to separate tetraploid from diploid plants after colchicine treatment of turnips (Brassica campestris var. rapa)

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