Genetic studies of heat and drought tolerance in maize
1940
Heyne, E.G. | Brunson, A.M.
Inheritance of tolerance to heat and drought was studied in selfed lines of corn and crosses among them. Heat tolerance was definitely inherited and, in most of the cases studied was intermediate to dominant. Hybrid vigor, in itself, apparently does not make a cross resistant to heat, at least in the seedling stage. Linkage relations were studied between one or more factors in 8 of the 10 linkage groups and the possible factors determining heat tolerance. Close associations of heat tolerance with the Su(1)su(1) and Prpr and a possible association with Cc loci were observed. The effects of gl(1) and gl(2) in the seedling stage apparently protect the corn seedlings from injury by artificial heat, while the factor gl(3) probably does not possess this protective quality. The su gene is considered to be directly responsible for susceptibility to heat injury as shown by the behavior of seedlings from sugary and starch kernels. The equal distribution of the semi-sterile and normal plants among those tolerant to heat from a backcross involving chromosome 4 strengthens this belief.
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