Effects of Reduction in Plant Height Induced by Chlormequat on Radiation Interception and Radiation-Use Efficiency in Wheat in Southwest Japan
スポンサーリンク
概要
- 論文の詳細を見る
The effects of reducing plant height by the growth retardant chlormequat on radiation interception and radiation-use efficiency in field-grown wheat were studied in southwest Japan. Chlormequat was applied to wheat cultivar Sanukinoyume 2000 at the beginning of jointing. The cumulative total solar radiation intercepted by the plant canopy (Si) was determined by continuous measurements of total solar radiation above the canopy with a dome pyranometer and below the canopy with tube solarimeters. Nondestructive measurement of leaf area index (LAI) and mean tip angle of the canopy (MTA) using a plant canopy analyzer<cc:Blue> <cc:>was performed weekly. Chlormequat application shortened the culm length by 12.6% compared with the control, but did not affect the aboveground dry matter (AGDM), LAI, yield or yield components except for the harvest index (HI). The extinction coefficient in canopy (K) was not affected by chlormequat, so that Si at heading and anthesis were not significantly different. Radiation-use efficiency (RUE) of chlormequat treated plants estimated from the slope of a linear regression of Si vs AGDM was 1.34 g MJ-1 for the period up to heading and 1.57 g MJ-1 for the period up to anthesis. The RUE values were not significantly different between chlormequat-treated and control plants. Although the effect may be restricted to the duration from heading to the premature ripening stage, a higher MTA in chlormequat should provide a more even distribution of radiation within the canopy, which should increase the photosynthetic performance. These results suggested that shortening the culm length of this wheat cultivar by about 12% is beneficial in reducing the risk of lodging without affecting light interception characteristics or RUE.
- 日本作物学会の論文
日本作物学会 | 論文
- レイメイとキヨニシキの出葉特性に関する二, 三の知見
- 91 冷害実験装置による水稲の冷害再現試験
- 水稲機械移植栽培の作期と生育収量について
- 42 低水温処理が水稲の生育収量ならびに根の機能におよぼす影響 : 3. 不稔発生様相等に現れた苗間の差異
- 機械移植による晩植水稲の生育相 : 第2報 出穂および諸形質への影響