Chromosome number of 421 seedlings derived from nine crosses of tetraploid pear cultivar 'Dayali' was observed, in which 15 seedlings being triploid of 2n = 3x = 51, 44 being tetraploid of 2n = 4x = 68, and frequency of polyploid produced from the offaprings of 'Dayali' pear being 14%.
Among which "Sui ling wan su li" and "Sui ling 73-81" in Hei-longjiang are triploid(2n = 3x=24), "Sha he zi cuo li" in Jilin is a chimera of tetraploid and diploid (2n = 4x=32,2n=2x=16).
The relative nuclear DNA content of nuclei isolated from young leaves including 4 diploid, 2 triploid and 1 tetraploid was measured by flow cytometry in grape cultivars.
When using tetraploid as female parent and liploid as male parent, the triploid proportion in progeny was 13.2%, higher than thst using diploid as female parent and tetraploid as male parent.
Electrophoretic analysis of 2 isozyme systems(MDH and GOT)were used to compared the difference of gene expression between apple's diploid and triploid,which indicated that the band intensities of MDH-1 in triploids was thicker than that in diploid,and the band number of GOT-1 in triploid was more than one in diploid.
The results indicated:The seeds of triploid Citrullus lanatus were surface sterilized as follows: (1) Rinsing with 75% alcohol for 30s. (2) Sterilizing with 10% bleaching powder and 0.5% NaClO for 30min and washing with sterile distilled water for 5min (3 to 5 times).
The best explants were hypocotyl and cotyledon of the seedlings which were two to six days old. The most suitable medium for callus induction to triploid Citrullus lanatus was MS+NAA 1.0mg/L+BA 0.5mg/L.
In C24(MS+NAA l.Omg/L+BA 0.5mg/L) medium, "Heimi 5 Hao" was the easiest one to induce callus. It would be a perfect material for somatic embryogenic cell induction of triploid Citrullus lanatus.
In order to improve wood properties of triploid clones of Populus tomentosa, urea-formaldehyde (UF) resin was compounded with nano-SiO2, coupling agents and flame retardants in different ways to prepare five kinds of modifiers.
A study on the biomass of fine roots and its relationship with water-stable aggregates (WSA) was conducted in two herbaceous models, triploid Populus tomentosa + Lolium multiflorum (TL) and triploid P.
Studies were made on the small seeds of some monoembryonic citrus. Chromosome counts of young embryo squashes 120~150 days after polli-nation and of root tips of seedling demonstrated that small seeds of monoembryonic diploids in citrus are triploids [2n=27=(3X)], except pummelo. The weight of these small seeds is about 1/3~1/8 that of the large seeds and the frequencies of small seeds are dependent on the cultivars. Because the triploid small seeds are precocious and fully developed, they germi...
Karyotypes of the tree paeony (Paeonia suffruticosa) species and its 5 Cultvars have been microscopically examined both cultivars and the original species are proved to be diploides with the only exception of Shou An-hong,being a triploid.Althouge the original species and the cultivars,have shown diversity in morphological features and flower types,no distinct differences in their karyotypes can be mode.There is close relation existing between the indistinct variation in karyotypes and that in the flo...
For a long time species in genus,paeonia were only found to be diploids and tetroploids.In 1955,Haga and ogata discovered a triploid herbaceous pe-ony(paeonia japonica).Recently P.suffruticosa cv.'Shou An Hong'was found to be a triploid.This is the first triploid discovered in tree peony.The ka-ryotype of this triploid cultivar was studied.It's stoma size and number p-er unit leaf surface were compared to those of the similar diploid cultirar 'Mo-Kui'
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