Effect of Air Temperature on the Content of Sugar and Vitamin C of Spinach and Komatsuna

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  • 栽培期間中の気温がホウレンソウおよびコマツナの糖とビタミンC含量に及ぼす影響
  • 栽培管理・作型 栽培期間中の気温がホウレンソウおよびコマツナの糖とビタミンC含量に及ぼす影響
  • サイバイ カンリ サクガタ サイバイ キカンチュウ ノ キオン ガ ホウレンソウ オヨビ コマツナ ノ トウ ト ビタミン C ガンリョウ ニ オヨボス エイキョウ

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Abstract

The relationship between the sugar and vitamin C contents in spinach (Spinacia oleracea L) and komatsuna (Brassica campestris L) and the maximum, minimum and mean air temperatures during the cultivation period was analyzed under conditions of limited solar radiation in winter. The results indicated that the minimum and mean air temperatures 10 days before harvest greatly affect the sugar and vitamin C contents in both crops. The sugar content (less than 1 g·100 g−1FW) and vitamin C content (less than 50 - 70 mg·100 g−1FW) in the two crops were not changed when the minimum air temperature 10 days before harvest was above 5 °C. However, when the minimum air temperature decreased below 5 °C, the two compounds increased linearly with the decreasing temperature. For example, when the minimum air temperature fell from 5 to −5 °C, the sugar content increased linearly from approximately 1 to 5 g·100 g −1FW and the vitamin C content increased from 50 - 70 to 175 mg·100 g−1FW. These date show that the sugar and vitamin C contents of spinach and komatsuna can be increased by controlling the minimum air temperature at 5 °C 10 days before harvesting.<br>

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