Effects of Fruit Thinning, Covering of the Fruit Truss and CO2 Enrichment on Radial Fruit Cracking in Tomato Production under Rain Shelter in Cool Uplands

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  • Suzuki Takashi
    Gifu prefectural Research Institute for Agricultural Technology in Hilly and Mountainous Areas The United Graduate School of Agricultural Science, Gifu University
  • Nomura Yasuhiro
    Gifu prefectural Research Institute for Agricultural Technology in Hilly and Mountainous Areas
  • Shimazu Teruaki
    The United Graduate School of Agricultural Science, Gifu University
  • Tanaka Itsuo
    The United Graduate School of Agricultural Science, Gifu University

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  • 夏秋トマト雨よけ栽培における放射状裂果の発生に及ぼす着果制限，果房被覆および二酸化炭素施用の影響
  • ナツアキ トマト アマヨケ サイバイ ニ オケル ホウシャジョウ レッカ ノ ハッセイ ニ オヨボス チャッカ セイゲン カボウ ヒフク オヨビ ニサンカ タンソ シヨウ ノ エイキョウ

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Abstract

Radial fruit cracking (RFC) can contribute to serious economic losses in tomato production under rain shelter in cool uplands. In order to investigate the effects of translocation and distribution of photosynthate to the fruits during the occurrence of RFC, tomato plants were grown under treatments with fruit thinning and CO2 enrichment, which regulate the strength of sink and source, and treatments with covering of the fruit truss, which decreases solar radiation incident on the fruit surface. The occurrence of RFC was increased by fruit thinning and CO2 enrichment, and decreased by covering of fruit truss. Time course of the percentage of RFC to total harvest showed a remarkable rise toward the end of August and toward the end of October in 2004, when harvested fruit weight was increasing. These finding suggest that RFC is attributed to excessive enlargement of the fruit by promotion of translocation and distribution of photosynthate from leaves (source) to fruits (sink) and the solar radiation incident on the fruits. In addition, the relation between RFC and the generation of a cork layer is considered.<br>

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