By Franklin S. Axelrod
Have you questioned the place a Puerto Rican plant grows, while it flora, the place it comes from? good, this is an annotated list of the vascular vegetation almost immediately discovered turning out to be within the wild at the island of Puerto Rico that may be a useful relief to botanists, ecologists, foresters and anybody else attracted to the vegetation of Puerto Rico. right here you will discover the distribution of vascular crops in the island supplied in response to a singular scheme that includes either wide physiographic parts and particular geographical websites. those are either defined within the textual content and illustrated by way of 3 maps. additionally, you will locate priceless info at the occasions of flowering, fruiting, and spore creation for every plant and likewise references for every one to fresh monographs on Puerto Rican vegetation the place a fuller description of every could be found.
In the earlier few years there were many adjustments within the names of person plant taxa (species, subspecies, and kinds) and within the alignment of plant households. those adjustments are recorded during this paintings in this sort of method that older clinical names in addition to Spanish universal names should be tracked to new authorised ones. considering that there's a lot overlap of the Puerto Rican plant life with that of different Caribbean islands and parts, those nomenclatural alterations may also be of use to researchers operating in these areas.
This list covers 2909 taxa which are incorporated in 1053 genera and 210 households. of those taxa 2335 (80.2%) are local and 574 (19.7%) are unique; of the local ones, 243 (10.4%) are endemic.
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Extra resources for A Systematic Vademecum to the Vascular Plants of Puerto Rico
Jacobs, 1987. ) Theor. Appl. Genet. 73: 920-925. , 1973. Haploidie bei der Zuckerriibe. Thesis, Justus Liebig-Universităt, Giesen. , 1. Slavova, G. Kikindonov and Zh. Ivanov, 1992. First results of the production of dihaploid multigerm lines of sugarbeet and their use in heterosis breeding. Genetika i Selektsiya 25(5): 375-378. 3. Haploidy in important crop plants - potato RICHARD E. VEILLEUX Contents 1. Introduction 2. Anther culture - development of the techniques for potato species 3. Embryo conversion 4.
In our own experiments, we found that both the induction frequency and the survival rate of the induced embryos were donor plant dependent and it was not unusual to Iose more than 50% of the induced embryos before they were ready for transplanting into soil. Some of the embryos died at an early stage of embryogenesis, whereas others were lost during subculture of the harvested embryos. Besides the effect of inadequate culture conditions, expression of lethal genes or failure in precocious germination may have affected embryo survival.
Of course, if the desired traits are due to more than one allele, a much smaller percentage of the doubled haploids can be used in the restoration. So far, we have not found any unexpected allelic segregation or for transgenes that could have developed as a result of ovule culture. ) 33 6. Conclusion At present cuI ture of unfertilized ovules is the method of choice for obtaining homozygous sugar beet plants. When compared with anther or free microspore culture, ovule culture is far more labour intensive, but as long as the androgenic response fails in beets, the gynogenic pathway is the only realistic alternative to traditional inbreeding.
A Systematic Vademecum to the Vascular Plants of Puerto Rico by Franklin S. Axelrod