The effects of competition on the growth of families of loblolly pine (Pinus taeda, L.) seedlings were investigated. The experimental design made it possible to evaluate the effects of crowding on growth and to determine the types and magnitudes of intergenotypic interactions among pairs of families. The results showed that intergenotypic interactions were both highly variable and pronounced in their effect on early growth. Evidence was also found for precompetition cooperating interactions occurring among seedlings surrounded by neighbors of the same family.
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Allard, R. W., Adams, J.: The role of inter-genotypic interactions in plant breeding. 12 Int. Congr. Genet. Proc. 3, 349–370 (1968).
Allard, R. W., Adams, J.: Population studies in predominantly selfpollinating species XIII. Intergenotypic competition and population structure in barley and wheat. Amer. Nat. 103 621–645 (1969).
Ayala, F. J.: Genotype, environment, and population numbers. Science 162, 1453–1459 (1968).
Brim, C. A., Schutz, W. H.: Inter-genotypic competition in soybeans II. Predicted and observed performance of multiline mixtures. Crop Sci. 8, 735–739 (1968).
Frey, K. J., Maldonado, V.: Relative productivity of homogeneous and heterogeneous oat cultivars in optimum and suboptimum environments. Crop Sci. 17, 532–535 (1967).
Jennings, P. R., Aquino, R. C.: Studies on competition in rice III. The mechanism of competition among phenotypes. Evolution 22, 529–542 (1968).
Jensen, N. F.: Multiline superiority in cereals. Crop Sci. 5, 566–568 (1965).
Lin, C. S., Torrie, J. H.: Effects of plant spacing within a row on the competitive ability of soybean genotypes. Crop Sci. 8, 585–588 (1968).
Sakai, K. I.: Competitive ability in plants: its inheritance and some related problems. Symp. Soc. exp. Biol. 15, 245–263 (1961).
Schutz, W. M., Brim, C. A.: Inter-genotypic competition in soybeans I. Evaluation of effects and proposed field plot design. Crop Sci. 7, 371–376 (1967).
Schutz, W. M., Brim, C. A., Usanis, S. A.: Inter-genotypic competition in plant populations I. Feedback systems with stable equilibria in populations of autogamous homozygous lines. Crop Sci. 8, 61–66 (1968).
Wilde, S. A., Voight, G. K.: Analysis of soils and plants for foresters and horticulturists. Ann Arbor, Mich.: J. W. Edwards Publisher, Inc. (1955).
Communicated by R. W. Allard
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Adams, W.T., Roberds, J.H. & Zobel, B.J. Intergenotypic interactions among families of loblolly pine (Pinus taeda L.). Theoret. Appl. Genetics 43, 319–322 (1973). https://doi.org/10.1007/BF00275259
- Early Growth
- Pinus Taeda