Effect of Light Intensity, Duration and Photoperiod on Chlorophyll and Glycoalkaloid Production by Potato Tubers.

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  • 光照度ならびに照射時間の差異がバレイショ皮層部のクロロフィルおよびグリコアルカロイド含量に及ぼす影響
  • ヒカリ ショウド ナラビニ ショウシャ ジカン ノ サイ ガ バレイショ ヒソ

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Abstract

We investigated the changes in chlorophyll (Chl) and potato glycoalkaloid (PGA) contents in the cortex of 'May Queen' potato tubers formed by the duration and intensities of different white fluorescent lights and photoperiods. The fluorescent light intensities and storage temperature on potato tubers in several markets were also examined.<BR>1. Both Chl and PGA contents in the cortex formed under white fluorescent light increased up to 12, 500 lx, but their contents decreased slightly at 15, 400 lx. The light intensity which induced a maximum production of the two compounds ranged from 8, 000 to 12, 500 lx.<BR>2. Chlorophyll synthesis in tubers was observed after a daily irradiation (3, 000 3, 900 lx) of 3-hr for 7 days at 15 °C, whereas an increase in PGA content was detectable even after a 30-min irradiation.<BR>3. The light intensities and storage temperatures on potato tubers displayed in several markets in Himeji city ranged from 2, 200 to 8, 000 Ix and 9 ° to 15 °C, respectively. Therefore, we recommend that potato displays in markets should be shielded from light and kept at 10 °C or below.

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