ABSTRACT
<p><b>OBJECTIVE</b>To study the effect of light intensity on photosynthetic characteristics and seedling growth of Prunella vulgaris under different light intensity.</p><p><b>METHOD</b>The seedling of P. vulgaris was shaded with shading net, and relative parameters were measured. The data was statistically processed.</p><p><b>RESULT</b>With the reducing light intensity, the young plant stems became slender, the leaf long increased. The plant height and net growth under 42% full light condition were significantly higher than those under the other light intensity, chlorophy II and carotenoid contents increased, as well as Chl a/b decreased under low light. Photosynthetic indicators of P(n), T(r) decreased under low light, but CO2 concentration increased, and G(s) content decreases and then increased under 10% full light intensity.</p><p><b>CONCLUSION</b>P. vulgaris manifested the different plasticity and adaptability under different light intensities. The 42% light intensity was the best and the proper shading would promote the growth of seedlings.</p>
Subject(s)
Adaptation, Physiological , Chlorophyll , Metabolism , Light , Photosynthesis , Radiation Effects , Plant Leaves , Radiation Effects , Plant Stems , Radiation Effects , Prunella , Radiation Effects , Seedlings , Radiation EffectsABSTRACT
<p><b>OBJECTIVE</b>To study the effect of water stress on physiological and the growth characters of Prunella vulgaris at the vegetative stage.</p><p><b>METHOD</b>The plants were treated timely and quantitatively by weighting method, and the relevant index were measured under different water stress conditions.</p><p><b>RESULT</b>With the long time of water stress, the plants of SY2 and SY3 showed the quickest growth rate and the best of growth vigor. The protective enzyme and osmoregulation substance presented the trend of increase firstly and then decrease. Under the same time of water stress, with the increase of extent in treatment, the protective enzyme and osmoregulation substance presented the trend of increase firstly and then decrease, and SY2 and SY3 were the lowest.</p><p><b>CONCLUSION</b>The protective enzyme and osmoregulation substance of P. vulgaris have a whole effect. The suitable water range of growth in P. vulgaris is 65%-80%.</p>