夏蜡梅杂交后代幼苗生长和光合特性

夏蜡梅（Sinocalycanthus chinensis）为国家2级保护植物，野生资源十分有限。采用不同种群的花粉与大明山夏蜡梅杂交，得到4种杂交后代塔沙降（TSJ）、白水（BS）、清凉峰（QLF）和顺溪坞（SXW）。通过对4种杂交后代和大明山（DMS）自然种群后代（对照）的幼苗的生长状况和光合生理特性的对比分析，结果表明：不同杂交后代幼苗，其生长和生理特性均有一定的差异。单株的叶片数、单株总叶面积、单株总叶长、植株生物量以SXW最高，与其它杂交后代和对照均差异显著。株高、单株总叶周长也以SXW最高，与对照差异显著。SXW的日均净光合速率显著高于其它杂交后代和对照；光饱和点也是SXW最高，与对照差异显著。这可能是SXW幼苗生长较快的原因之一。SXW的杂交后代是否有较强的适应能力，还需作进一步深入地研究。

Growth and Photosynthetic Characteristics of the Seedlings of Sinocalycanthus chinensis Hybrid Progeny

The wild resources of Sinocalycanthus chinensis the Class Ⅱ protected plant in China, are limited. S.chinensis in Daming Mountain was pollinated by the pollens of S.chinensis in Tashajiang, Baishui, Qingliangfeng and Shunxiwu, respectively. The hybrid progeny was named as TSJ, BS, QLF and SXW, respectively. Natural progeny in Daming Mountain was used as control (DMS). The growth and photosynthetic characteristics of hybrid progeny were compared with natural progeny. The results showed that there were significant differences in the growth and physiological properties between hybrid and natural progeny. The leaves number, total leaf area, leaf length and total biomass per plant were the highest in SXW, and there were significant differences with the other hybrid and natural progeny. The plant height and total leaf perimeter per plant were also the highest in SXW, being significantly different with natural progeny. The daily average net photosynthetic rate of SXW hybrid progeny was significantly higher than the other hybrid progeny. The light saturation point was the highest in SXW, being significantly different with natural progeny. This might be one of the reasons why the seedlings of SXW hybrid progeny grew much faster. Whether SXW hybrids have a strong adaptive ability needs further and deeper studies.