不同基因型玉米冠层温度与产量和水分利用效率的关系

2007年在甘肃陇东旱塬利用红外测温仪研究了19个基因型玉米冠层温度与产量、水分利用效率的关系。结果表明，不同基因型玉米在子粒灌浆期存在着冠层温度高度分异的现象，其差异可反应在产量和水分利用效率的不同上。无论灌浆初期还是中期或后期，旱地玉米产量、水分利用效率与冠层温度呈极显著的负相关(R²= 0.445～0.634)，并且随着灌浆期推移，相关性增大。表明灌浆期冠层温度偏低的品种具有较高产量和水分利用效率，冠层温度可作为高产节水品种田间筛选的指标。

Relationship of Canopy Temperature with Grain Yield and Water Use Efficiency in Various Genotypes of Maize

Field studies were conducted to examine the differences in canopy temperature(CT) and the relationships between CT to grain yield and water use efficieuy(WUE) in nineteen maize genotypes with a portable infrared thermometer at Zhenyuan, Gansu of China in 2007. The result showed that the considerable differences in CT, the differences increased with the development of plant and the maximum differences were observed at mid-late grain filling stage. Among the genotypes studied, a highly negative regression between CT and grain yield/WUE was established, no matter in early or middle or late grain filling stage and the R² values(R²=0.445 - 0.634)increased as grain filling proceeded. These results indicated that the varieties had high-yield and high-WUE with low CTs, CT can be used by breeding programs as a potential selection criterion for grain yield and WUE in wheat.