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Productivity‐independent initial growth of individual leaves in sunflower ( Helianthus annuus L.)
Author(s) -
Oishi Yuji
Publication year - 1991
Publication title -
ecological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.628
H-Index - 68
eISSN - 1440-1703
pISSN - 0912-3814
DOI - 10.1007/bf02347134
Subject(s) - helianthus annuus , sunflower , productivity , biology , nutrient , agronomy , irradiance , growth rate , botany , mathematics , ecology , economics , geometry , macroeconomics , physics , quantum mechanics
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.