Bowden R L, Rouse D I, Sharkey T D
Department of Plant Pathology, University of Wisconsin, Madison, Wisconsin 53706.
Plant Physiol. 1990 Nov;94(3):1048-55. doi: 10.1104/pp.94.3.1048.
Young, visually symptomless leaves from potato (Solanum tuberosum) plants infected with Verticillium dahliae exhibited reduced carbon assimilation rate, stomatal conductance, and intercellular CO(2), but no increase in dark respiration, no change in the relationship between carbon assimilation rate versus intercellular CO(2), and no change in light use efficiency when intercellular CO(2) was held constant. Therefore, the initial decrease in photosynthesis caused by V. dahliae was caused by stomatal closure. Errors in the intercellular CO(2) calculation caused by uneven distribution of carbon assimilation rate across the leaf were tested by (14)CO(2) autoradiography. Patchiness was found at a low frequency. Low stomatal conductance was correlated with low leaf water potentials. Infection did not affect leaf osmotic potentials.
感染大丽轮枝菌的马铃薯（Solanum tuberosum）植株上幼嫩且无视觉症状的叶片，其碳同化率、气孔导度和胞间二氧化碳浓度降低，但暗呼吸未增加，碳同化率与胞间二氧化碳浓度之间的关系未改变，且当胞间二氧化碳浓度保持恒定时，光利用效率也未改变。因此，大丽轮枝菌引起的光合作用最初下降是由气孔关闭导致的。通过¹⁴CO₂放射自显影检测了因叶片碳同化率分布不均导致的胞间二氧化碳计算误差。发现斑块现象的频率较低。低气孔导度与低叶水势相关。感染并未影响叶片渗透势。
