BN—29548 
A cytologist at the U.S. Regional Pasture Research 
Laboratory, University Park, Pa., studies chromosome 
behavior. 
To make better use of cytogenetics in research on 
grasses and legumes, we need more information on— 
@ Transferring characters between species and creat- 
ing new species through hybridization. 
® Restoring fertility in sterile hybrids. 
@ Investigating the effects of chromosomal behavior 
and cytoplasm on seed-set. 
@ Determining the effects of genetics and environ- 
ment on asexual seed-set. 
®@ Determining the origin and inheritance of asexual 
seed-set and male sterility. 
® Establishing the physiological consequences of 
changing the number of chromosomes. 
® Identifying mutagenic agents as well as the types 
and value of mutations. 
®@ Determining the origin and genetic behavior of 
natural and induced polyploids. 
@ Isolating genetic markers for basic and applied 
studies. 
N-13377 
Crosses between related species often fail to produce 
seed. Embryos reared under an agar surface in diffused 
light and at controlled temperature—like eggs in an 
incubator tray—sometimes circumvent this problem. 
This seedling is from a cross made at Lincoln, Nebr., 
between white and yellow sweetclover. 
N-31863 
Grass specialists examine Kentucky bluegrass mutants 
at the Plant Industry Station, Beltsville, Md. Mutations 
obtained by irradiation and chemical treatments are of 
value in studying gene action and inheritance in 
breeding. 
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