水稲個体群における環境と個葉の生産・消費活動との関係 : 第4報 栽植密度と施肥量を異にする個体群内個葉の葉位別・時期別の光合成および呼吸の変化
スポンサーリンク
概要
- 論文の詳細を見る
To understand the contribution of each positional leaf to the dry matter production in rice populations or individual plants, net photosynthetic and dark respiration rates of individual leaves of different position and age were measured at four growth stages (reduction division stage, boot stage, heading stage and ripening stage) under full light and mutual shading conditions in the paddy field where different fertilization (high fertilizer, 1 kg/a of each of the three main elements; low fertilizer, 0.2 kg/a of the same elements) and plant spacing (wide spacing, 30 × 22.5 cm; close spacing, 30 × 7.5 cm) were given. 1. The maximum rate of photosynthesis of the uppermost leaf was considered to show the full capacity of production, and the ratio of the photosynthetic rate of each individual leaf to that of the uppermost leaf under the full light condition was regarded to indicate its relative vitality, while the decrease in the photosynthetic rate under mutual shading compared with that under full light was thought to be caused by the external factors. 2. At reduction division stage, the relative vitality of middle and lower leaves to the upper leaf were 80% ca. and 60% ca., respectively; and the external factors lowered the photosynthetic rates under mutual shading by 20% ca. and 35% ca. in the middle and lower leaf, respectively, compared with those under full light. Photosynthetic rate decreased as the time progressed, and the heavily fertilized plants had more efficient leaves in photosynthesis than those lightly fertilized during all the experimental period, but there was no significant difference between those of different plant spacing. In general, photosynthetic rates of individual leaves both under full light and mutual shading conditions decreased about 20% by each descend ofleaf position from the top. 3. Dark respiration rates decreased proportionally to photosynthetic rates during the aging processes of the leaves. The dark respiration rate of the lowest leaf did not exceed 30% of its net photosynthetic rate under mutual shading. Therefore, even the lowest leaf did not seem to be so-called parasitic.
- 日本作物学会の論文
- 1980-06-30
著者
関連論文
- 水稲個体群における環境と個葉の生産・消費活動との関係 : 第5報 栽植密度と施肥量を異にする個体群内個葉の2, 3の化学成分の葉位別・時期別変化
- 水稲個体群における環境と個葉の生産・消費活動との関係 : 第4報 栽植密度と施肥量を異にする個体群内個葉の葉位別・時期別の光合成および呼吸の変化
- 水稲個体群における環境と個葉の生産・消費活動との関係 : 第3報 葉位別個葉の光合成・呼吸に及ぼす遮光の影響
- 水稲個体群における環境と個葉の生産・消費活動との関係 : 第2報 葉位別個葉の光合成・呼吸に対する温度の影響
- 水稲個体群における環境と個葉の生産・消費活動との関係 : 第1報 圃場における個葉の光合成と暗呼吸
- 61 水稲個体群の物質生産における個葉の機能と役割 : II. 栽植密度と施肥量を変えた圃場における個葉の二,三化学成分の葉位別,時期別変化.
- 124 水稲個体群の物質生産における個葉の機能と役割 : I.栽植密度と施肥量の異なる圃場における葉位別,時期別個葉の光合成・呼吸速度の変化