Dynamic of Water Transport in Napiergras (Pennisetum purpureum Schumach) Plant : Relationship between Water Transport Regulation and Water Storage Capacity in the Diurnal Water Balance

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概要

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• The characteristics of economical water transport in napiergrass were investigated with respect to water transport regulation by the nodal stem and a water storage capacity (WSC), partly compensation for transpiration with water in the plant. Changes in leaf photosynthesis after plant excisions suggested that water transport to the leaves was mainly regulated by the nodal stem in the morning and the stem base regulated instead in the aftenoon. Contrary to Plant transpiration rate (PTr), water absorption rate by roots (SF) increased slowly and leaf water potential (Ψ[leaf] ) decreased in the morning. However, because of SF increase, Ψ[leaf] gradually recovered in the afternoon. It was condired thar water condifions would be related to the contribute to maintenance of PTr, and it was estimated that WSC compensated 8% of total PTr. On the oter hand, WSC of pot-cultivated plant was estimated to be 3% and WSC in stem was higher than that of leaf from the relationship between PTr and decrease in water content of plant parts. It was considered tat these were involved in controlling water balance in napiegrass.

• 九州大学の論文

著者

• Nagasuga Kiyoshi

  National Agricultural Research Center For Tohoku Region Climate Change Research Team

• Nagasuga Kiyoshi

  National Institute Of Agrobiological Sciencies

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• Dynamic of Water Transport in Napiergras (Pennisetum purpureum Schumach) Plant : Relationship between Water Transport Regulation and Water Storage Capacity in the Diurnal Water Balance

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