Agronomic Studies on Quinoa (<i>Chenopodium quinoa</i> Willd.) Cultivation in Japan

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  • 我が国におけるキノアの栽培に関する作物学的研究
  • 我が国におけるキノアの栽培に関する作物学的研究 : 開花期以降の昼・夜温がキノアの子実肥大に及ぼす影響
  • ワガクニ ニ オケル キノア ノ サイバイ ニ カンスル サクモツガクテキ ケンキュウ : カイカキ イコウ ノ ヒル ・ ヤオン ガ キノア ノ シジツ ヒダイ ニ オヨボス エイキョウ
  • —Effects of Day and Night Temperature After Flowering Time on Seed Thickening—
  • －開花期以降の昼・夜温がキノアの子実肥大に及ぼす影響－

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Abstract

The effects of day and night temperatures after flowering on the seed growth of quinoa were examined using two varieties, Amarilla de Marangani (valley type) and NL-6 (sea-level type), cultivated in growth cabinets. From sowing to flowering time, both varieties were grown at a day temperature of 25°C and night temperature of 10°C under a 13-hour day length condition. After flowering, the plants were divided into 6 plots, and kept under an 11-hour day length condition with a day temperature of 30°C, 25°C or 20°C with a night temperature of 17°C (30/17, 25/17, 20/17°C), or night temperature of 10°C, 15°C or 20°C with a day temperature of 25°C (25/10, 25/15, 25/20°C). The increase of night temperature from 10 to 20°C did not change the seed thickness. However, the decrease of day temperature from 30 to 20°C promoted seed growth, and the 1000 seed weight was the largest at 20°C although the seed thickness was not changed. The change in day temperature to 20°C increased both 1000 seed weight and seed number in Amarilla de Marangani, and the seed weight was the heaviest at a day temperature of 20°C. On the other hand, in NL-6, the seed number decreased with the decrease in day temperature, and seed weight was the heaviest at a day temperature of 30°C. Thus, there were differences in the effects of day temperature on seed growth and formation between the valley type and sea-level type quinoa.

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