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A-5.2.1 Interactive effects of increased UV-B and global warming on crop growth

[Contact Person]

Oura Noriko
Global Agro-environmental research team
National Institute of Agro-environmental Sciences
Ministry of Agriculture, forestry and fisheries
3-1-1 Kannondai, Ibaraki 305-8604, Japan
Tel:+81-298-38-8356 fax:+81-298-38-8199
E-mail: nori@niaes.affrc.go.jp

Total Budget for FY1996-FY1998

11,642,000Yen (FY1998 4,050,000Yen)

Abstract

A greenhouse experiment was carried out to investigate the effects of UV-B on wheat (Triticum aestivum L.) growth and yield and its interactive effects with other environmental factors, according to the fractional (1/2) factorial design of 6 factors (UV-B, CO₂, temperature, soil fertility, wheat cultivar and block) with the orthogonal array table (L₃₂).
Results were, 1) Seed yield was not affected by increased UV-B irradiation (induced by 20-300/0 ozone depression) alone nor interactively. 2) CO₂ concentration and cultivar differences may modify effects of UV-B on tiller numbers. 3) Increased UV-B irradiation promoted the increase of tiller numbers in the early growth period, but final tiller number fell off under ambient CO₂ concentration compare with high CO₂ concentration, 4) Sensitiveness differed among wheat cultivars; Kitakamikomugi was not affected by UV-B, while UV-B increased tiller numbers or inhibited plant height for Norin 61.

[Key Words]

UV-B, Global warming, CO₂, Interactive effects, Wheat