毛白杜鹃(Rhododendron mucronatum) 适生光强的生理生化研究

研究了毛白杜鹃最适生境的相对光强和其在不同相对光强生境中抗性变化的规律。结果表明：当生境的相对光强处于65％以上时，毛白杜鹃叶子内过氧化物酶和过氧化氢酶活性达到较低值，而还原型Vc，单宁酸，多酚类的含量达到了较高值。同时，在相对光强为65％以上的生境中，毛白杜鹃类不仅生长发育健壮，抗逆性强，而且，开花指数和观赏价值达到了较高值。因此，推断毛白杜鹃类适生生境的相对光强为65％以上。而且过氧化物酶和过氧化氢酶活性及还原型Vc、单宁酸、多酚类的含量可以作为衡量植物是否处于适生生境的指标。

Biochemical and Physiological Studies on the Effct of Optimum Light Intensity for the growth and Development of Azalea

Two azalea (Rhododendron mucronatum) cultivars, under various relative light intensity (Rli) , were studied. Lower activity for catalase (CTA) and peroxdase (POX) , and higher content for reduced Vc tanin and polyphenol were found in habitats under Rli>65%, also with higher flowering index and more tolerent to adverse environmental conditions. Thus, the habitats under Rli>65%, were favourable for the growth and development of azalea. The activity of POX and CTA, and the content of tanin and polyphenal, and the reduced Vc in plant leaves could be considered as the criterion to dotermine whether the habitats were fit for their favourable growth and development.