ISHS Acta Horticulturae 711: V International Symposium on Artificial Lighting in Horticulture
LIGHT CONTROL OF GROWTH AND DEVELOPMENT IN VEGETABLE PLANTS WITH VARIOUS LIFE STRATEGIES |
| Author: | I.G. Tarakanov |
| Keywords: | plant strategies, photomorphogenesis, photoperiodism, pre-adaptation, light environment design |
| Abstract:
Vital (photosynthetic) and signal role of light in the control of growth and development was studied in several species of vegetable plants, representing various life-forms and life strategies (competitor, stress-tolerator, and ruderal). It was found that some of the genotype by light environment interactions can be ascribed to the differences in such traits as the length of juvenile phase, critical daylength, civil twilight sensitivity, light spectral quality response. Both photoperiodic response and shade avoidance response in neighbor-sensing are predicted due to the unique mechanisms of "outstripping reality reflection". The effect of different environmental stimuli (e.g., daylength or red : far-red ratio under the canopy) often results in the same developmental and morphogenetic pattern depending on the plant life (or coenosis) strategy. Changes in source-sink relations observed in marginal light environments (both low irradiation level and unfavorable photoperiod) modify plant developmental pattern and productivity, especially in genotypes with low level of phenotypic plasticity and adaptation potential. Screening of germ plasma of diverse geographical origin in "analyzing" light environments shows that the genotype reaction norm variability must be taken into consideration in plant density optimization, crop timing, and light regime design. | |
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