00441nas a2200157   4500008004100000245005300041210004900094300001200143490000700155653001800162653001800180653001500198100001400213700001600227856004000243       1991                        eng d00aTriglochin maritima L. (Triglochin maritimum L.)0 aTriglochin maritima L Triglochin maritimum L  a531-5550 v7910aBritish Isles10aJuncaginaceae10aTriglochin1 aDavy, A J1 aBishop, G F  uhttp://www.jstor.org/stable/226073102107nas a2200145   4500008004100000245005900041210005900100300001100159490000700170520169000177100001401867700001501881700001601896856004901912       1990                        eng d00aGenetic variation and adaptation to flooding in plants0 aGenetic variation and adaptation to flooding in plants  a91-1080 v383 aEvidence exists for genetic variation that can be associated with the evolution of adaptations to flooding: variation related to flooding at the level of molecular mechanism; comparisons of the patterns of variation in flooding-tolerant and non-tolerant species; within-species variation associated with genetically-differentiated populations that enable certain higher plants to tolerate or avoid the effects of flooding are understood. Yet little is known of the genetic basis for these features and less of its variation. An analysis was done of Salicornia, which exists as locally differentiated populations in different tidal flooding regimes, from the lowest to the highest parts of salt marshes. Genetic differentiation can be demonstrated by significant selection coefficients against alien types in reciprocal transplant experiments. The genetic variation within and between these populations were investigated using restriction fragment length polymorphism studies of the ribosomal DNA (rDNA). Two rDNA repeat unit types were found, only one of which occurs in any individual plant. Only the 12-kilobase (kb) fragment was found in populations that experience the most flooding, whereas plants on the highest parts of the marsh had only the 10.5-kb fragment. Typical lower and upper marsh populations were mixed in their fragment compositions, but lower marsh areas supported a higher frequency of the 12-kb fragment than upper marsh and depressions supported a higher frequency of the 12-kb fragment than raised interfluve areas. The use of such DNA variation, which is itself unselected , as a marker for selected genetic variation shows considerable promise for the future.1 aDavy, A J1 aNoble, S M1 aOliver, R P  uhttps://juncaginaceae.myspecies.info/node/88