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Natural and Controlled Loblolly x Shortleaf Pine Hybrids in Mississippi

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Means for most of 20 vegetative characters of young F1 hybrids between Pinus taeda L. and Pinus echinata Mill. were intermediate to those of the interplanted parental checks, while ranges overlapped. Rows of stomates were consistently more numerous in the hybrid than in either of the parent species. The F1 hybrids were in plantations on a cultivated site, an uncultivated site, and a poor sandhill site. The best separation of characters for the parent species occurred on the sandhill site. In comparisons across sites, character fluctuation was sometimes so great that the species could not be distinguished by mean measurements. Separation of hybrids and parents which minimized such genotype-environmental disturbances was obtained by combining certain vegetative characters in pictorialized scatter diagrams. The diagrams resulted in good distinction between the parent species and hybrids in two areas where natural hybrids occurred. The 14 trees identified as natural hybrids were assumed to be F1's and backcrosses. Six reproductive characters were also examined on the trees which were flowering in the natural stands. Male strobili length was outstandingly discriminative as a single character. In combination with other reproductive characters, it confirmed the separation of species and hybrids that had been achieved with the vegetative characters. In the hybrids, dominance was noted for loblolly in vegetative characters and flowering phenology and for shortleaf in morphologic reproductive characters.

Document Type: Journal Article

Affiliations: Member of the Inst. of Forest Genetics, Southern Forest Expt. Sta., Forest Service, U. S. Dept. Agric., Gulfport, Miss.

Publication date: September 1, 1965

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