Baccharis halimifolia

Baccharis Oxide.—The interesting structure (79) has been proposed for baccharis oxide, from Baccharis halimifolia. In biogenetic terms baccharis oxide is readily derivable from the cation (80), which leads to ebelin lactone (81) and shionone (82). On treatment with boron trifluoride dihydro-baccharis oxide rearranged to (83). 

Artemisia verlotorum Lamotte Arctotheca nivea (L.) Lewin Aster subulatus Michaux Baccharis halimifolia L. 

Reports on the triterpene composition of Baccharis genus are recorded in the literature. Baccharis oxide, Fig. (21) is a common and unique triterpene found in many Baccharis species, such as Baccharis halimifolia L. [54] and B. salicifolia [55], The NMR spectra of this compound was assigned ambiguously [56], but recently Nurnberg et al. [57] established the total NMR chemical shift assignments of baccharis oxide. 

Anthonsen, T., T. Bruun, E. Hemmer, D. Holme, A. Lamvik, E. Sunde, and N. A. Sorensen Baccharis Oxide, a new Triterpenoid from Baccharis halimifolia L. Acta Chem. Scand. 24, 2479 (1970). 

Obviously the next question involves the transfer of resistance. If crosses are made between the Baccharis species will resistance be imparted to the offspring What sort of Mendelian ratios might be found Would this better be accomplished by protoplast fusion and tissue culture Can this resistance be transferred to other genera Is there a practical application (herbicide incorporation into seed) for this discovery Do the genes that enable B. megapotamica to handle the trichothecenes exist in B. halimifolia and, if they do, what turns them on or off There is some exciting work yet to be done in this area of research. And we have now entered the next topic. 

A moot question at this point concerns peptidyl transferase. How different, or similar are the peptidyl transferases within a given plant species How different are they from species to species, for example Baccharis megapotamica versus B. halimifolia Or are there slight changes in the nature of the 60s ribosomes from species to species ... 

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