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Additional resources for Cacti Cultivation Instructions
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.