Effects of High and Low Temperature Conditions on the Fruit Setting and Growth of the Parthenocarpic Tomato 'Renaissance'

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  • 高温および低温条件下における単為結果性トマト‘ルネッサンス’の着果および果実肥大特性
  • コウオン オヨビ テイオン ジョウケンカ ニ オケル タンイ ケッカセイ トマト ルネッサンス ノ チャッカ オヨビ カジツ ヒダイ トクセイ

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Abstract

Effects of high and low temperature conditions in greenhouse on the fruit setting and growth of the parthenocarpic tomato ‘Renaissance’ were examined. Under high temperatures with a mean peak daytime temperature of 39.2°C, the fruit setting rate of ‘Renaissance’ was 100%, and there were no undergrown fruit due to the steady expression of parthenocarpy. At the same condition, the non-parthenocarpic tomato cultivar ‘Momotaro york’ was not able to fertilize, and the fruits did not develop normally without treatment using 4-chlorophenoxy acetic acid (4CPA). Furthermore, under low temperatures with a mean daytime low of 5.9°C, the fruit setting rate of ‘Renaissance’ was 100%, and there were no undergrown fruit due to the steady expression of parthenocarpy. Under the same condition, ‘Momotaro york’ fertilized imperfectlly, the incidence of undergrown fruit was 61%, and treatment with 4CPA was necessary to achieve normal fruit development. It was suggested that the productivity of ‘Renaissance’ was higher than that of the non-parthenocarpic tomato cultivar because the fruits of ‘Renaissance’ developed normally without pollination and the synthetic auxin treatment under high and low temperatures as in this experiment.<br>

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