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THE PHOTOPERIODIC RESPONSE OF AMERICAN PROSOPIS AND ACACIA FROM A BROAD LATITUDINAL DISTRIBUTION
Author(s) -
Peacock J. Talmer,
McMillan Calvin
Publication year - 1968
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1968.tb06955.x
Subject(s) - acacia , prosopis , prosopis juliflora , biology , population , latitude , range (aeronautics) , botany , geography , demography , materials science , geodesy , sociology , composite material
Prosopis and Acacia from North and South America were studied in the laboratory under constant and increasing night length under two temperature regimes. The Prosopis juliflora (Sw.) DC. complex showed strong populational differentiation; Acacia farnesiana (L.) Willd. showed minimal populational differentiation. In Prosopis a population from Oklahoma (36° N) showed the greatest inhibition of stem height under increasing night length. A population from Peru (6° S) showed least control of stem height by night length. In Acacia the response of the latitudinal series was relatively uniform within each of the 6 sets of light period‐temperature conditions. In general the height increase for Acacia was two to three times greater under the warmer regime than under the cooler regime at a given night length. Since Acacia farnesiana occurs sympatrically with the Prosopis juliflora complex over a broad range of latitudes, it is of interest to find that the distributional mechanisms of these two leguminous trees are basically different.