Effect of irradiance and plant age on the dimensions of the growing shoot of poplar |
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Authors: | George A Pieters M E van den Noort |
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Institution: | Dept of Plant Physiological Research, Agricultural Univ., Gen. Foulkesweg 72, 6703 BW Wageningen, The Netherlands. |
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Abstract: | Populus euramericana (Dode) Guinier cv. Robusta plants were cultivated at irradiances of 7.5, 15 and 30 W m−2 (32.5, 65 and 130 μmol m2 s−1), 400–700 nm at 22°C and a relative humidity between 40 and 60% on a gravel culture subirrigated with Hoagland's nutrient solution. The basal diameter of the growing shoot, a measure of the number of apical cells participating in growth, increased proportionally to irradiance and was correlated with mature leaf length. The development of the length of the growing shoot (Lgs) depended also on the nutritional status of the (young) shoot. Lgs was strongly correlated with the rate of height growth. |
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Keywords: | Growing shoot growth pattern growth vigour irradiance height growth leaf length phyllotaxy plant age poplar vascular system |
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