abstracts of papers presented at the 1962 meetings - Genetics

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994 ABSTRACTS mouse typhoid than the outbred T. (Work supported by U. S. Public Health Service Research Training Grant 2G-246.) WIJEWANTHA, RONALD T., and G. LEDYARD STEBBINS, University of California, Davis, California.: Developmental genetics of the agropyroides mutant in barley.-A mutant affecting spike morphology was recovered from a dalapon treated field of six-rowed barley, variety California mariout. F, progeny from reciprocal crosses showed single factor inheritance with the mutant behaving as a recessive.-The upper parts of mutant spikes bear nodes with a single spikelet and with the glumes placed laterally rather than dorsally. This produces a morphological resemblance to Agropyron (or Triticum). The name Agropyroides, and the gene symbols ag ag, are therefore suggested for this mutant.-Agropyroides homozygotes show 100% penetrance and variable expressivity. The ug gene inhibits development of lateral spikelet components during early differentiation. At comparable nodes on a developing spike, the central spikelet primordium grows much faster than that of the lateral spikelet, the growth ratio being 13:2, as compared to 7:2 for normal spikes.-When crossed reciprocally to the two-rowed barley variety, Atlas deficiens, agropyroides, showed a modified dihybrid segregation in the F,, since two-rowed is incompletely dominant over six-rowed.-On a six-rowed background, ag decreases the number of spikelets per node in the upper half of the spike, but on a two-rowed deficiens background the opposite effect, increase in spikelet number, is produced at some of these nodes. WOLFF, G. L., The Institute for Cancer Research, Philadelphia, Pa.: Body and tail length differences between yellow (A’a) and nonyellow (aa) mice in parabiosis.-The existence of hormonal differences between (AYa) and nonyellow(aa) mice has long been suspected. If such differences exist, they might be detectable in parabionts. Inbred yellow and nonyellow mice from the YS/ChWf strain were joined parabiotically at four weeks of age with littermates of the same sex in three combinations: AYa:AYa, AYa:aa, aa:aa.-By 27-31 weeks of age the bodies, exclusive of the tails, of the yellow mice were longer (P
ABSTRACTS 995 possibly third) mitotic wave also appears, starting at about 28 hours. Thus, even in the slowly proliferating forestomach, cells which have divided once have a certain tendency to divide again within a very short time. (Research carried out at Brookhaven National Laboratory under the auspices of the U.S. Atomic Energy Commission and supported by U.S. Public Health Service Fellowship No. CF-14, 272 from the N.I.H.) WUNDERLICH, JOHN R., and LEONARD A. HERZENBERG, Department of Genetics, Stanford University School of Medicine, Palo Alto, California: A second gamma globulin isoantigen (allotype) in the mouse.-A gamma globulin isoantigen was reported to be present in serum from the inbred mouse strains “BALB/c,” C3H/He and “Champagne-Glaxo” but absent from the serum of “C57BL” (KELUS, A., and J. K. MOOR-JANKOWSKI, Nature 191:1405, 1961). We have found a second gamma globulin isoantigen demonstrable by immunoelectrophoresis on cellulose acetate. Antiserum from BALB/c animals immunized with the globulin fraction of C57BL/6J serum forms a single precipitin line in the gamma globulin region of the electrophoregram with serum from C57BL/6J and also from C57BL/Ka, C57BWlO.l and B10.D2. It does not react detectably with serum from BALB/c, or A/J, C3H/Sn, DBA/2J and CBA/J. The antigen is present in all tested F, progeny from the mating of a positive by negative strain. Appropriate backcrosses have been set up.-A sensitive test has shown this isoantigen to be associated with antibody activity. When a C57BL/Ka antiserum to the collphage T2 is used as antigen in reaction with the BALB/c antiglobulin serum, a specific loss of the phage-neutralizing activity results, indicating that the isoantigen is on antibody molecules. YAMADA, YUKIO, and A. E. BELL, Purdue University, Lafayette, Indiana: Selection for 13th day larva weight in Tribolium under two nutritional 1euels.-Selection for large and small 13th-day larva weight in Tribolium castaneum has been investigated in order to evaluate the effectiveness of various selection methods and the importance of genotype by environment interaction under two different nutritional levels. In addition to an unselected control population, there were eight experimental populations as follows: GL = selected large based on sib record under the good level each generation; PL = selected large under poor level each generation; - GPL = selected large on average performance under both levels; GPL = selected large under good and poor levels in alternating generations; and similar four populations for small direction. Each population was reproduced by 4.0 single pair matings each generation under standard wheat medium. Selection was made on the basis of full sibs reared either under good, poor, or average of both levels, depending on the selection methods. After choosing the best eight families out of 40, five males and five females from each selected family were taken from the standard medium. They were mated at random with the restriction that full-sib matings are avoided. Therefore, each family has full-sib records under both environments, and any specific environmental carry-over effect through parents is completely removed by the use of sib selection from the standard medium.-Heritability of the selected trait in the base population both under good and poor levels of nutrition was estimated to be roughly 20-25% and the genetic correlation was about 0.50 (HARDIN 1962).-Effectiveness of the selection methods and role of interaction will be discussed. (Supported by a grant from the National Science Foundation.) YANAGISAWA, KEIKO, (Introduced by FRANCIS J. RYAN), Columbia University, New York, New York: The simultaneous accumulation of RNA and of a repressor of ,&galactosidase synthesis.- The methionine-requiring mutant, 58-161, of E. coli, continues to synthesize RNA even after being deprived of all exogenous methionine. The effect of methionine starvation on the formation of P-galactosidase was studied using this strain. After methionine starvation, a long lag was observed in /3-galactosidase formation, although total protein started to increase immediately upon restoration of methionine. This delay was not observed in E. coli 15 hismet-, in which RNA is not synthesized during methionine starvation. If the former strain was deprived of a carbon source along with methionine, RNA did not increase during starvation and no delay was
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ABSTRACTS OF PAPERS PRESENTED AT TH
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ABSTRACTS 939 ARAKAKI, DAVID T., (I
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ABSTRACTS 941 BAND, H. T., and P. T
Page 7 and 8: ABSTRACTS 943 were the C57BL/6 pure
Page 9 and 10: ABSTRACTS 945 BROWN, RUSSELL V., an
Page 11 and 12: ABSTRACTS 94 7 development of corn
Page 13 and 14: ABSTRACTS 949 some closely linked t
Page 15 and 16: ABSTRACTS 95 1 An approach to this
Page 17 and 18: ABSTRACTS 953 Fox, A. S., I. L. MUN
Page 19 and 20: ABSTRACTS 955 mutants which form a
Page 21 and 22: ABSTRACTS 95 7 tion, respectively,
Page 23 and 24: ABSTRACTS 959 found in meiotic stag
Page 25 and 26: ABSTRACTS 961 cessive generations o
Page 27 and 28: ABSTRACTS 963 tances. For genes mor
Page 29 and 30: ABSTRACTS 965 environment interrela
Page 31 and 32: ABSTRACTS 967 dent maize inbred lin
Page 33 and 34: ABSTRACTS 969 procedure leaves much
Page 35 and 36: ABSTRACTS 971 63.1%. These results
Page 37 and 38: ABSTRACTS 973 hours to several week
Page 39 and 40: ABSTRACTS 975 to mutagen-induced li
Page 41 and 42: ABSTRACTS 977 the course of the exp
Page 43 and 44: ABSTRACTS 9 79 RBDEI, G. P., Univer
Page 45 and 46: ABSTRACTS 981 of the mutant alleles
Page 47 and 48: ABSTRACTS 983 enzyme synthesis.-Fiv
Page 49 and 50: ABSTRACTS 985 infected. Because vir
Page 51 and 52: ABSTRACTS 987 +/Su-V and Su-V/Su-V
Page 53 and 54: ABSTRACTS 989 sulfate concentration
Page 55 and 56: ABSTRACTS 991 XI1I.-These observati
Page 57: ABSTRACTS 993 body” is observed i
Page 61: ABSTRACTS 997 indole requirement si
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abstracts of papers presented at the 1962 meetings - Genetics

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