RESPONSE OF WHEAT GROWTH AND CO2 ASSIMILATION TO ALTERING ROOT-ZONE TEMPERATURE
RESPONSE OF WHEAT GROWTH AND CO2 ASSIMILATION TO ALTERING ROOT-ZONE TEMPERATURE
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DOI：
10.1139/b90-341
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发表时间：
1990-12-01
期刊：
影响因子：
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通讯作者：
FRANCKO, DA
中科院分区：
文献类型：
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作者：
ALHAMDANI, SH;TODD, GW;FRANCKO, DA
小麦植株(Triticum aestivum L.var.)Chisholm)生长在气温23摄氏度和根区温度3摄氏度的条件下，与生长在根区温度23摄氏度的植株相比，其地上部和根的干重和叶面积显著减少。这一下降与显著降低的CO2同化速率有关，这与较低的叶片电导率、较低的内部CO2浓度和更多的负水势有关。CO2同化速率低也与地上部淀粉和总可溶性糖水平高、光合作用产物转运量少、库需求量少有关。改变根区温度对叶片叶绿素浓度的影响不大，而根区温度为3℃时的水分利用效率是根区温度为23℃时的1.5倍。
Wheat plants (Triticum aestivum L. var. Chisholm) grown at an air temperature of 23-degrees-C and a root-zone temperature of 3-degrees-C exhibited a significant reduction in shoot and root dry weight and leaf area compared with plants grown at a root-zone temperature of 23-degrees-C. This reduction was correlated with a significantly lower CO2 assimilation rate that was associated with lower leaf conductance, lower internal CO2 concentration, and more negative water potential. Low CO2 assimilation rate was also associated with high starch and total soluble sugar levels in the shoot, less translocation of photosynthate, and possibly less sink demand. Leaf chlorophyll concentration was not affected by altering the root-zone temperature, whereas water use efficiency of plants grown at a root-zone temperature of 3-degrees-C was as much as 1.5 times higher as those grown at 23-degrees-C.