GROWTH-RESPONSE OF A CHRYSANTHEMUM CROP TO THE ENVIRONMENT .3. EFFECTS OF RADIATION AND TEMPERATURE ON DRY-MATTER PARTITIONING AND PHOTOSYNTHESIS
GROWTH-RESPONSE OF A CHRYSANTHEMUM CROP TO THE ENVIRONMENT .3. EFFECTS OF RADIATION AND TEMPERATURE ON DRY-MATTER PARTITIONING AND PHOTOSYNTHESIS
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DOI：
10.1093/oxfordjournals.aob.a085732
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发表时间：
1979-01-01
期刊：
影响因子：
4.2
通讯作者：
SAWYER, S
中科院分区：
文献类型：
--
作者：
ACOCK, B;CHARLESEDWARDS, DA;SAWYER, S
菊花的营养作物在日光同化室中生长5或6周。分析了不同辐射水平和温度对作物干物质分配、比叶面积、叶片光合作用和冠层截光的影响。新形成的干物质分配给叶片的比例几乎是恒定的，但随着辐射的增加或温度的降低，更大比例的干物质分配给茎组织，而牺牲了根组织。地上部干物质含量与全碳干物质比呈显著正相关。假设作物所有叶片的光合作用行为相同，对冠层光合作用进行了分析。作物环境对叶片光化学效率影响较小。光饱和度下单位叶面积的总光合速率PA （max）随辐射积分的增加而增加，但单位叶干物质的相同参数PW （max）几乎不受生长辐射的影响。相反，PA （max）几乎不受温度的影响，而PW （max）随生长温度的升高而升高。这是因为比叶面积随温度的降低而减小，随辐射的减小而增大。冠层呼吸积分与光合积分之间存在正相关关系，尽管试验期间作物质量变化了4倍，但冠层呼吸的维持分量仍然很小且保持不变。林冠消光系数与辐射积分变化不一致，与温度呈负相关。冠层拦截辐射效率的下降完全抵消了随生长温度升高而增加的特定碳同化率，使生长速率完全取决于入射光的水平。
Vegetative crops of chrysanthemum were grown for 5 or 6 wk periods in daylit assimilation chambers. Crop responses to different radiation levels and temperatures were analyzed into effects on dry matter partitioning, specific leaf area, leaf photosynthesis and canopy light interception. The percentage of newly formed dry matter partitioned to the leaves was almost constant, although with increasing radiation or decreasing temperature, a greater percentage of dry matter was partitioned to stem tissue at the expense of root tissue. There was a positive correlation between the percentage of dry matter in shoot material and the overall carbon:dry matter ratio. Canopy photosynthesis was analyzed assuming identical behavior for all leaves in the crop. Leaf photochemical efficiency was only slightly affected by crop environment. The rate of gross photosynthesis per unit leaf area at light saturation, PA (max), increased with increasing radiation integral, but the same parameter expressed per unit leaf dry matter, PW (max) was almost unaffected by growth radiation. In contrast, PA (max) was hardly affected by temperature but PW (max) increased with increasing growth temperature. This was because specific leaf area decreased with decreasing temperature and increased with decreasing radiation. There was a positive correlation between canopy respiration integral and photosynthesis integral, and despite a 4-fold change in crop mass during the experiments, the maintenance component of canopy respiration remained small and constant. Canopy extinction coefficient showed no consistent variation with radiation integral but was negatively correlated with temperature. This decrease in the efficiency of the canopy at intercepting radiation exactly canceled the increase in specific carbon assimilation rate that occurred with increasing growth temperature, giving a growth rate depending solely on the incident light level.