Comparison of Photosynthesis, Postillumination CO<sub>2</sub>, Outburst, and C0<sub>2</sub> Compensation in Poplar Varieties, Sunflower, and Bean

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  • 光合成・光呼吸・CO<sub>2</sub>補償点の種間差異-ポプラクローンとヒマワリ・ミトリササゲとの比較
  • 光合成・光呼吸・CO2補償点の種間差異--ポプラクローンとヒマワリ・ミトリササゲとの比較〔英文〕
  • コウゴウセイ ヒカリ コキュウ CO2 ホショウテン ノ シュカン サイ ポプ

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Photosynthesis, postillumination C02 outburst, the CO2 compensation points, and dark respiration in leaves of four varieties of poplar (Populus euramericana Hardtwalden, P. nigra×maximowizii, 2 n & 4 n, P. maximowizii×trichocarpa) were compared with those in sunflower (Helianthus annuus) and bean (Vigna sesquipedalis) leaves. The maximum rate of net photosynthesis (NPmax) in sunflower leaves, estimated by the algebraic method, was 1. 13 to 1. 63 times greater than in leaves of poplar varieties. The magnitude of the initial CO2 outburst (PIB-1) in sunflower leaves was 6mg C02dm-2hr-1, which was 2- to 4-fold greater than that in leaves of poplar varieties. Bean leaves had 2 to 4mg CO2 dm-2 hr-1 of PIB-1. The CO2 compensation points in poplar varieties and in sunflower and bean were 50_??_57 and 44_??_50ppm, respectively. Sunflower leaves had a mean gross photosynthetic rate of about 40mg CO2 dm-2 hr-1, and poplar leaves had 23_??_33mg CO2 dm-2 hr-1. The rate of gross photosynthesis in bean leaves was about 30mg CO2 dm-2 hr-1. Results indicated that leaves of poplar varieties photosynthesize at rates similar to those herbaceous species of sunflower and bean.

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