ABSTRACT
Diversity within the plant kingdom may be partially explained as the evolutionary response of photoautotrophic life to the variation of environmental conditions around the earth. Plant geneticists and breeders have been encouraged to exploit the genetic diveristy occurring among plants and their variable adaptation in high soil salinity. Two main obstacles have to be considered. First, natural selection favors plants that survive and compete well. But this is not the criterion needed to meet the needs of plant breeding in agriculture. Second, the genetic diversity needed for plant breeding may be absent or only partially present within closely related relatives to our present-day crops. The cotton leaves that had been collected at the end of the greenhouse experiment for the purpose of several analyses were subjected to water extraction and thereafter to cryoscopic analyses.
