RELATIONSHIP BETWEEN NITROGEN-CONTENT IN LEAF BLADES AND PHOTOSYNTHETIC RATE OF RICE PLANTS WITH REFERENCE TO STOMATAL APERTURE AND CONDUCTANCE
RELATIONSHIP BETWEEN NITROGEN-CONTENT IN LEAF BLADES AND PHOTOSYNTHETIC RATE OF RICE PLANTS WITH REFERENCE TO STOMATAL APERTURE AND CONDUCTANCE
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DOI：
10.1626/jcs.48.543
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发表时间：
1979-01-01
影响因子：
--
通讯作者：
OGURA, T
中科院分区：
文献类型：
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作者：
ISHIHARA, K;IIDA, O;OGURA, T
在用红外气体分析仪测定光合速率前几天，在土壤中添加硫酸铵，制备了不同氮含量的水稻植株。用改良的入渗法和扩散阻力仪分别测定了同一叶片的气孔开度和导度。叶片含氮量与光合速率呈显著正相关，但相同含氮量的叶片光合速率也有一定的差异，可能是气孔开度和导度不同所致。在较宽的氮含量范围内，气孔开度或导度与叶片光合速率呈高度正相关。高氮含量的叶片，由于气孔开度和导度的增加，光合速率增加。在气孔开度和导度相同的情况下，只有在气孔开度足够大的情况下，叶片含氮量与光合速率才呈正相关。在相同气孔开度和导度的叶片中，氮含量的增加对光合速率的提高作用相对较小。叶肉电导率与叶片氮含量呈显著正相关，尤其是氮含量较低时。两个因素被认为是在光合速率的增加与N含量：在CO2固定的叶绿体活性的增加和减少的阻力CO2从大气中转移到叶肉由于气孔孔径和电导率的增加。
Rice plants with different N content were prepared by additional application of ammonium sulfate to soils several days before the measurement of photosynthetic rate in gasmetric system using an IR gas analyzer. Stomatal aperture and conductance on the same leaf blades used for the measurement of photosynthesis was measured by improved infiltration method and by diffusive resistance meter, respectively. A positive correlation was found between N content in leaf blades and photosynthetic rate, but the photosynthetic rate varied to some extent even in leaf blades with the same N content, probably due to the difference of stomatal aperture and conductance. A high positive correlation was clarified between stomatal aperture or conductance and the photosynthetic rate in leaf blades with wide range of N content. The photosynthetic rate increased due to the increase in the stomatal aperture and conductance in leaf blades with higher N content. A positive correlation was found between N content and photosynthetic rate in leaf blades with the same stomatal aperture and conductance only when the extent of stomatal opening was sufficient. The increase in the photosynthetic rate due to the increase in N content was comparatively small in leaf blades with the same stomatal aperture and conductance. Mesophyll conductance was positively correlated with N content in leaf blades, especially with lower N content. Two factors are considered in the increase in photosynthetic rate in relation to N content: an increase in chloroplast activity in CO2 fixation and a decrease in the resistance to CO2 transfer from the atmosphere to mesophyll due to the increase in stomatal aperture and conductance.