Articles
MODELING PELARGONIUM X HORTORUM BAILEY GROWTH AND MODEL RESPONSE TO ENVIRONMENTAL STRESS
Article number
174_27
Pages
227 – 234
Language
Abstract
Development of Pelargonium X hortorum Bailey ‘Red Elite’ plants was measured bi-weekly from sowing to anthesis for 3 experiments, each containing 15 treatments arranged according to the Central Composite design.
Regression equations developed from the first experiment which was performed in growth chambers were used in a computer simulation model to predict dry matter accumulation, leaf area, flowering, and other prominent plant characteristics.
Environmental data from the second and third experiments, unstressed and stressed greenhouse conditions, respectively, were used as inputs to the model, and predicted growth was compared with observed growth.
Plants in stressed greenhouse treatments received constant high temperature and irradiance (30°C and 150 μmol s-1m-2) during days 21–33 from sowing.
Model predictions of dry matter and leaf area agreed closely with both chamber and unstressed greenhouse data for total mean irradiance of 250–350 μmol s-1m-2, day temperature of 20–25°C, and 15–25°C night temperature.
Root, stem and leaf dry weights were seen to increase with increased irradiance.
Flower initiation appeared optimum at 25°C day temperature while flower bud development was most rapid at 27°C. Both irradiance and day temperature were more influential on flowering time than was night temperature.
Model predictions of dry matter, leaf area, and flowering varied considerably from observed values, suggesting that extremes in environment could not be accounted for with the present model.
Regression equations developed from the first experiment which was performed in growth chambers were used in a computer simulation model to predict dry matter accumulation, leaf area, flowering, and other prominent plant characteristics.
Environmental data from the second and third experiments, unstressed and stressed greenhouse conditions, respectively, were used as inputs to the model, and predicted growth was compared with observed growth.
Plants in stressed greenhouse treatments received constant high temperature and irradiance (30°C and 150 μmol s-1m-2) during days 21–33 from sowing.
Model predictions of dry matter and leaf area agreed closely with both chamber and unstressed greenhouse data for total mean irradiance of 250–350 μmol s-1m-2, day temperature of 20–25°C, and 15–25°C night temperature.
Root, stem and leaf dry weights were seen to increase with increased irradiance.
Flower initiation appeared optimum at 25°C day temperature while flower bud development was most rapid at 27°C. Both irradiance and day temperature were more influential on flowering time than was night temperature.
Model predictions of dry matter, leaf area, and flowering varied considerably from observed values, suggesting that extremes in environment could not be accounted for with the present model.
Publication
Authors
D. A. Hopper, W. H. Carlson, Royal D. Heins
Keywords
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