Phureja-haploid Tuberosum hybrids, which produce 2n gametes in addition to n gametes, were used to obtain diploid progenies in 2x - 2x matings, and tetraploid progeny in 4x - 2x matings. Seven of these diploid clones were intermated in a modified diallel design, and also crossed to seven cultivars,
Manipulation of the 2n-gametes frequencies inSolanumpollen
โ Scribed by R. Eijlander
- Book ID
- 104620570
- Publisher
- Springer
- Year
- 1988
- Tongue
- English
- Weight
- 407 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0014-2336
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โฆ Synopsis
Besides the normal gametes, some 2x potato genotypes produce 2n-gametes as well . In interploidy crosses (2x x 4x, 4x x 2x) 2n-gametes are necessary, whilst in intercrossing at the diploid level they are undesirable . By means of a set of simply constructed sieves, pollen of several 2n-pollen producing progenitors have been sifted . It was possible to increase the 2n-pollen content of low 2n graded pollen to interesting levels . No decrease in in vitro pollen vitality due to the treatment could be demonstrated . The in vivo pollen vitality of the aqueous pollen suspension was satisfactory to very good under cool weather conditions .
๐ SIMILAR VOLUMES
The production of 2n pollen (pollen with the sporophytic chromosome number) was evaluated in 4x and 6x taxa of Vaccinium section Cyanococcus . Mean frequencies of 2n pollen producers were 17 .1% and 8.3% in natural 4x and 6x populations, respectively . The frequency of 2n pollen producers in the 4x
Crosses between male sterile L. corniculatus (2n=4x=24) and L. tenuis (2n=2x=12) plants were performed in order to verify the presence of 2n gametes in L. tenuis. All but one of the plants from these crosses had 2n=4x=24 and the L. corniculatus phenotype; this plant had 2n=2x=12 and the L. tenuis ph