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>

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>