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Temperature and Leaf Growth in Lolium perenne. III. Factors Affecting Seasonal Differences

J. M. Peacock
Journal of Applied Ecology
Vol. 12, No. 2 (Aug., 1975), pp. 685-697
DOI: 10.2307/2402182
Stable URL: http://www.jstor.org/stable/2402182
Page Count: 13
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Temperature and Leaf Growth in Lolium perenne. III. Factors Affecting Seasonal Differences
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Abstract

(1) Shoot growth rates of perennial ryegrass cv. S24 were examined in relation to seasonal changes in temperature in the region of the stem apex. Experiments were carried out in the field during spring and autumn. (2) There were seasonal trends in all the various attributes of shoot growth but the most striking feature was that, at similar temperatures, the rate of leaf extension in the spring was significantly higher than in the autumn. (3) Further studies in controlled environments showed that the seasonal difference in the effect of temperature upon the rate of leaf extension was independent of other environmental factors and that some plant developmental (morphogenetic) factor was involved. It is suggested that this endogenous mechanism, controlling the seasonal pattern of growth, is strongly linked with the plant's change from a vegetative to a reproductive phase.

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