明期と暗期の気温差および光合成有効光量子束がバレイショ培養小植物体のシュ-ト長および生長に及ぼす影響

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Potato plantlets (Solanum tuberosum L. cv. Benimaru) under CO2 enriched and photoauto-trophic culture conditions were subjected to three different photo-/dark period temperature combinations (25°/15°C, 20°/20°C and 15°/25°C) and two levels of photosynthetic photon flux densities (74 and 147 μmol-m -2.sec-1). The shoot length of the plantlets under the same photosytnthetic photon flux density (PPF) was reduced with decreasing the difference between photoperiod and dark period temperatures (it is named DIF, photoperiod temperature minus dark period temperature). No marked differences in the fresh and dry weights per plantlet were observed among the three DIF treatments in each PPF treatment. The higher PPF led to a decrease in the shoot length, an increase in the fresh weight, dry weight and leaf area per plantlet in each DIF treatment. It is suggested that shoot length of plantlets in vitro under CO2 enriched and photoautotrophic culture conditions can be controlled without reducing the weight increments and leaf area per plantlet by regulating the difference between photoperiod and dark period temperatures.
園藝學會の論文