Genetic and Evolutionary Relationships in Atriplex

Abstract

In this chapter we will review the available information on genetic relationships among various taxa of Atriplex as determined by cytogenetic methods, and the attempts to hybridize these taxa both at the intra- and inter-specific levels. Such studies are of utmost importance in understanding the evolutionary processes operating in speciation. In Atriplex, they also serve as a unique tool in elucidating the evolutionary and genetic aspects of an especially interesting example of adaptive differentiation, namely the C₄ pathway of photosynthesis which is present in certain taxa but absent in others.