Relationship between photosynthetic characteristics and environmental factors in leaves of Pueraria lobata / 中国中药杂志

<p><b>OBJECTIVE</b>To study the relationship between photosynthetic characteristics and environmental factors in leaves of P. lobata.</p><p><b>METHOD</b>Photosynthetic characteristics and environmental factors were measured by using CIRAS-2 portable photosynthesis system.</p><p><b>RESULT</b>The apparent quantum yield in leaves was 0.0173 micromol CO2 x micromol(-1) photon. The dark respiration rate was 2.9333 micromol x m(-2) x s(-1). The light compensation point of photosynthesis was 180 micromol x m(-2) x s(-1). The light saturation point was 1600 micromol x m(-2) x s(-1). The carboxylation efficiency was 0.0338 micromol x m(-2) x s(-1). The light respiration rate was 2.5 micromol x m(-2) x s(-1). The CO2 compensation point was 100 micromol x mol(-1), The CO2 saturation point was 1 600 micromol x mol(-1).</p><p><b>CONCLUSION</b>Photo flux density and air temperature are major environmental factors influencing diumal changes of net photosynthetic rate.</p>

Study on seed quality test and quality standard of Platycodon grandiflorum / 中国中药杂志

<p><b>OBJECTIVE</b>To study quality test, and establish quality classification standard of Platycodon grandiflorum.</p><p><b>METHOD</b>The seed quality and planting quality of P. grandiflorum from different producing areas and in different growing years were measured.</p><p><b>RESULT AND CONCLUSION</b>The range of seed purity, weight per 1000 seeds, seed moisture content,seed viability were determined and the primary seed quality classification standard was established.</p>

Observation of pollen tube germination of Platycodon grandiflorum by fluorescence microscopy / 中国中药杂志

<p><b>OBJECTIVE</b>To determine the self-compatibility of Platycodon grandiflorum and the location of microspore germination on stigma.</p><p><b>METHOD</b>The microspore germination of self-pollination, self-plant-pollination and cross-pollination and the pollination microspore germination in and outside of stigma were observed with fluorescence microscopy.</p><p><b>RESULT</b>Most pollens of self-pollination, self-plant-pollination and cross-pollination can germinate on the stigma, and after 24 hours, pollen tube entered into the ovary successfully. Pollinated on the outer-surface of stigma, microspores could not germinate, but on the inner-surface of the stigma when it dehisced most microspores can germinate.</p><p><b>CONCLUSION</b>The compatibility of self-plant-pollination of Platycodon grandiflorum is high. The microspore germination loci is on the inner-surface of the dehisced stigma.</p>

Advances in research on pharmacodynamics and chemical conversion of catalpol / 中国中药杂志

Catalpol is a active component in Rehmannia Root, and its pharmacological effects are extensive. In this paper its effects and chemical changes were summarized. This will offer the reference for further research work catalpol.