Photosynthetic activity and water relations of sprouts ofPasania edulis |
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Authors: | Satoshi Ito Koichiro Gyokusen |
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Institution: | (1) Research Division of University Forests, Kyushu University, 812 Fukuoka, Japan;(2) Laboratory of Silviculture, Department of Forestry, Faculty of Agriculture, Kyushu University, 812 Fukuoka, Japan |
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Abstract: | In order to investigate the factors causing fast growth of sprouts ofPasania edulis, photosynthetic activity and water relation characteristics of lower (mature) leaves and upper (expanding) leaves of the
sprouts were compared with those of seedlings and adult trees ofP. edulis. Apparent quantum yield was generally low. Maximum photosynthetic rate was highest in the lower leaves of sprouts. Stomatal
frequency was higher in sprout leaves than in seedling leaves. Osmotic potential at the water saturation point and water potential
at the turgor loss point, in leaves, were higher in sprouts than in seedlings and adult trees. Symplasmic water content per
unit leaf area was higher in sprouts than in seedlings. These water relation parameters in leaves indicated that sprout leaves
are superior in maintaining cell turgor against water loss, but are not tolerant to water stress. In field measurements, sprout
leaves showed higher stomatal conductance and transpiration rates. These results indicated that sprout leaves fully realized
their high potential productivity even under field conditions. The leaf specific conductance, from the soil to the leaf, was
higher in sprouts than in seedlings. Large and deep root systems of the original stumps of the sprouts may be attributed to
the high leaf specific conductance. |
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Keywords: | leaf specific conductance leaf water relations potential productivity stump root system water stress |
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