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Cacti Cultivation Instructions

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In most cases, stem internodes are longer, leaf areas smaller and plant growth rate lower in low R : FR ratios than in neutral shade. Some species, however, are able to maintain their morphogenetic pattern, even under the low R : FR ratios of leaf-filtered light; invariably these are species characteristic of shaded habitats, such as forest floors (Fig. 7). These species experience permanently reduced R : FR ratios and appear to have evolved insensitivity to them. In the annual balsam Impatiens capensis, plants from open sites were more responsive to low R : FR ratios than plants from woodlands, suggesting that selection within a set of populations of a single species produces the same differentiation (Dudley and Schmitt, 1995).

Minor 8 day 0 day 5 day 10 6 4 2 0 2 C. 9 Rates of net CO2 assimilation in young (A) and mature (˜˜) leaves of young trees of species of Clusia, native to Trinidad, raised under identical conditions in a growth chamber. The measurements were made under well-watered conditions (day 0) and after 5 and 10 days without further irrigation. The solid bar on the x-axis indicates the duration of darkness. C. P. ) assimilation by the C3 pathway was restricted to daylight hours; drought caused prolonged midday closure of stomata, and eventually brought about a very limited induction of CAM on day 10 (weak CAM-inducible).

The concept of the monolayer implies some mechanism for leaf orientation that minimizes gaps between leaves. It is well known that the leaves on branches of some trees form mosaics‘, interlocking patterns that appear to fill space very effectively (Fig. 9). Achieving such patterns requires precise movements during growth, as for example by phototropism. Tropic responses remain a physiological enigma. Much of the groundwork was laid by Darwin and an apparently adequate explanation was propounded by Went and his co-workers in the 1920s, based on a theory of auxin movement.

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