キュウリの光合成産物の動態に及ぼす温度の影響-2-キュウリの14C-光合成産物の動態に及ぼす夜温の影響
スポンサーリンク
概要
- 論文の詳細を見る
In the previous paper (6), it was reported that the temperature of 25°C in day and 14°C at night was the most suitable for raising healthy seedlings of cucumber. The purpose of the present study was to examine the effect of night-temperature on the translocation of 14C-photosynthates after 14CO2 feeding by using tracer techniques.Seeds of cucumber, variety“Natu-Sairaku No. 3”were sown on April 17, 1971, and transplanted into plastic pots of 15cm in diameter on April 21 at the stage of cotyledon expansion. From April 24, the pots were placed in a phytotron programmed by“the gradient temperature control system”(6). The day-temperature was set from 10:00AM to 14:00PM at 25°C and the night-one from 2:00AM to 6:00AM at 14°C. The shift between day- and night-temperatures was made as moderate as possible.On May 30, uniformly raised seedlings were exposed to 14CO2 in an assimilation chamber for 60 minutes under the natural light condition. Then the distribution of 14C-radioactivities was determined immediately after 14CO2 feeding (Exp. A), and two days (Exp. B), and three days (Exp. C) later. The temperature after 14CO2 feeding was kept at 25°C in day and at 20°C (high-night; H) or 14°C (low-night; L) at night by the horizontal temperature control system.Results obtained were summarized as follows:1. Percentage of dry matter to fresh weight decreased at the high night-temperature after 14CO2 feeding, while it remained constant in the low night-temperature. It is considered that the plant exhausted much more photosynthates at the high night-temperature (20°C) than at the low one (14°C) (Fig.3).2. Specific activity of respective plant part, shown in Table 2 was the highest in the blade of the tenth leaf from the base, and very low in the old- (1st-2nd) and adult-leaves (3rd-7th), when it was determined immediately after 14CO2 feeding. After 14CO2 feeding, specific activity of the young leaves except stem apex (8th-12th) decreased remarkably, and those of the stem apex (T), the stem, and the root increased, at high night-temperature. In other hand, only a little decrease in specific activity occurred at the low night-temperature (Fig.4).3. After the dried sample of each plant part was extracted with hot ethyl alcohol, the alcohol extract was fractionated into four fractions by the procedure described in Figure 1. Radioactivities of five fractions including the alcohol insoluble fraction were compared for each plant part. Radioactivity of the alcohol insoluble fraction containing starch, protein and cellulose increased in the low night-temperature lot, but not in the high night-temperature lot (Fig. 11).4. The translocation of photosynthates was faster and their exhaustion by respiration was higher at the high night-temperature (20°C) than at the low night-one (14°C). Consequently, the final reservation of photosynthates was more at the low night-temperature than at the high night-one.On the efficient temperature management in the cultivation under growing structures, it is reasonably recommended from the point of reservation of photosynthates that the air temperature should be kept low at night.
- 園藝學會の論文
著者
関連論文
- 5-3P トウモロコシ根におけるリンの移行(5.植物の無機栄養および養分吸収)
- 種々な起源のβ-グルコシダ-ゼによるステビオシドおよびステビオ-ルビオシドの水解
- 6.ステビオールビオシドの伸長促進作用とβ-グルコシダーゼによる水解 (第22回大会研究発表抄録)
- 6 ステビオールビオシドの伸長促進作用とβ-グルコシダーゼによる水解
- 12.高等植物起源のβ-グルコシダーゼによるステビオシドの水解 (第21回大会研究発表抄録)
- 12 高等植物起源のB-グルコシダーゼによるステビオシドの水解
- ワイルドライスの植物学的位置と食品的価値
- テンサイにおける糖の分配--光合成産物の通導過程における一時貯溜と変換・蓄積の酵素組織化学的解析
- 71 サンプリングの時刻と光合成産物の体内分配 : トウモロコシ地上部における器官別分配
- テンサイの葉における糖の分配 : 採取時刻と組織部位による糖含量の差異
- 113 サンプリングの時刻と光合成産物の体内分配 : テンサイの葉柄における糖分配の組織間差
- テンサイの葉柄組織細胞におけるPhosphoglucose Isomeraseの組織化学的検出
- 登熟期の水稲体内における蛋白質及びアミノ酸の変化
- 酵素法 (HK/G6P-DH法) によるテンサイ植物体の糖の定量
- テンサイの葉柄柔組織におけるUDPG-Pyrophosphorylaseの組織化学的検出
- 水稲の登熟機構に関する生理的研究
- カトレアの齢別シュートにおける14CO2の暗期同化能と14C同化物の転流
- 夜温がカーネーションの生育ならびに14C-同化産物の転流におよぼす影響の品種間差異
- キュウリにおける光合成産物の移行・分配と着果との関係
- 蛍光性色素を生産するPseudomonas属およびBacillus属細菌のキュウリ連作土壌における動態
- キュウリ栽培土壌より分離された細菌の性質
- キュウリの光合成産物の動態に及ぼす温度の影響-2-キュウリの14C-光合成産物の動態に及ぼす夜温の影響
- キュウリの光合成産物の動態に及ぼす温度の影響-1-種々の気温で育苗した苗の14CO2とりこみと光合成産物の配分