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Inheritance of the Capacity for Chloride Inclusion and Chloride Exclusion by Soybeans¹

Roots of Glycine max (L.) Merr. varieties absorb chloride ions in comparable amounts, but subsequent translocations of chlorides to plant tops is genetically controlled. Some varieties accumulate relatively large amounts of chlorides in plant tops; others exclude them almost completely. Chlorides occur in petioles and leaflets, with higher concentrations in leaflets, but whole leaf samples can be used to classify chloride-accumulating capacity.

The chloride includers growings in the saline soils of the Imperial Valley of California develop severe leaf necrosis from chloride toxicity, whereas the chloride excluders show no necrosis

Crosses between parents with similar chloride accumulating capacity gave F₂ and F₃ progeny similar to parents in chloride content. In eight crosses from parents dissimilar in chloride accumulation, F₂ plants segregated in ratios of 3 chloride excluder to 1 includer. In tests of the F₃ progeny from these crosses, the F₂ excluder plants segregated in ratios of 1 excluder to 2 segregating, whereas the F₂ includer plants bred true.

In backcrosses of the F₁ plants from an includer by excluder cross, the segregating ratio was 1 includer to 1 segregating line when the recurrent parent was an includer and 1 excluder to 1 segregating line when the recurrent parent was an excluder.

The gene symbols Nel and nel are proposed as the dominant for chloride excluders and the recessive for chloride includers, respectively.

Key Words: Glycine max. (L.) Merr. • Chloride inheritance • Chloride includers and excluders • Chloride accumulation • Chloride toxicity symptoms

² Research Agronomist. Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, now located at Mesa, Arizona, P. O. Box 858, 85201.

Received for publication May 4, 1969.

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