Plants for the Future: A Gardener's Wishbook by Jerome Malitz

By Jerome Malitz

The writer speculates at the vegetation that could be created sooner or later via genetic engineering and artistic hybridization. He provides a wishlist through gazing fascinating traits present in soft or fussy participants inside a number of plant households that will be bred into hardier species.

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Hence, attempting to classify plants according to phylogeny and evolutionary history leaves too many unanswered questions, and relatedness has to be deduced from the shared traits of existing plants. But the question remains: How does one measure the relative primacy of traits? What degree of similarity between two plants determines that they belong to the same class, or the same family, or the same genus? Page 25 The Modern Approach: Computers and Mathematical Formulae Some systematists believe that the traditional methodology allows such judgments to be made on grounds that are too subjective and hence unscientific.

Yet, there are limits. Some desirable plants are sterile. Some show such high variability when grown from seed that they need to be vegetatively cloneda procedure that if done in the traditional way might be prohibitively slow and expensive. And one can entertain all sorts of crosses that seem promising but cannot be realized by the traditional method of applying the pollen of one species onto the stigma of another. In the latter half of the twentieth century a whole new battery of techniques has been developedtechniques that are revolutionizing the creation of new plants and techniques with seemingly limitless potential.

The allocation of homologues is independent from pair to pair, as illustrated.  For three homologous pairs there would be eight (2×2×2) possible gamete genotypes. Page 33 Figure 3-6 The union of two haploid gametes during fertilization produces a diploid cell in which the chromosomes are present in homologous pairs. process, and much more research needs to be done before we can claim to have an adequate understanding of differentiation. Meiosis Another type of cell division serves an entirely different end.

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