Productivity-independent initial growth of individual leaves in sunflower (Helianthus annuus L.) |
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Authors: | Yuji Oishi |
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Institution: | (1) Department of Botany, Faculty of Science, University of Tokyo, Hongo, 113 Tokyo, Japan |
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Abstract: | Growth rates of individual leaves attached to sunflower (Helianthus annuus) plants were measured experimentally under different levels of environmental productivity, modified by irradiance and nutrient
conditions. The unfolding rate and final area of an individual leaf increased with increasing environmental productivity.
The final area of an individual leaf also varied according to differences in leaf order. The declining pattern of relative
leaf area growth rate (RLGR) varied with environmental productivity; leaves in a productive environment had a longer period
of high sustained initial RLGR than leaves in a less productive environment. However, maximum RLGR was hardly influenced by
leaf order or environmental factors such as irradiance and mineral nutrition.
This article is dedicated to Prof. Emeritus Toshiro Saeki in recognition of his fruitful career in plant ecology. |
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Keywords: | Irradiance Leaf order Leaf unfolding rate Nutrients Relative leaf area growth rate (RLGR) |
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