不同品种红花檵木光合特性的比较分析

Comparative analysis on photosynthetic characteristics of different varieties Loropetalum chinense var.rubrum

在同一自然环境下,对不同品种红花檵木的叶片光合特性进行研究。结果表明:3种红花檵木玫红尖叶青、冬艳紫红和大叶玫红的净光合速率和蒸腾速率均呈双峰曲线,气孔导度均呈单峰曲线,胞间CO2浓度均呈单谷曲线,Pn日均值为,玫红尖叶青>冬艳紫红>大叶玫红;玫红尖叶青的光补偿点、光饱和点、CO2饱和点、表观量子效率和羧化效率要高于其他2种红花檵木,而CO2补偿点则正好相反;在光合色素的比较方面,叶绿素a、叶绿素b、叶绿素a/b、叶绿素(a+b)和类胡萝卜素含量为:玫红尖叶青>冬艳紫红>大叶玫红;而在类胡萝卜素/叶绿素和花色素苷含量则正好相反。

The leaf photosynthetic physiological characteristics of different varieties Loropetalum chinense var.rubrum were studied in the same condition.The results showed that the diurnal process of photosynthetic rate and transpiration rate of the three varieties Loropetalum chinense var.rubrum changed in a double-peak curve,the diurnal process of stomata conductance and intercellular carbon dioxide concent ration of three varieties Loropetalum chinense var.rubrum changed in a single-peak curve and a single-vale curve separately;the photosynthetic rate ＇Meihong Jianyeqing＇〉 ＇Dongyan Zihong＇〉 ＇Daye Meihong＇;the light compensation point,light saturation point,CO2 saturation point,apparent quantum yield,carboxylation efficiency ＇Meihong Jianyeqing＇were higher than others;but the CO2 compensation point ＇Meihong Jianyeqing＇ was lower than others;on the photosynthetic pigments compared,the chlorophyll a,chlorophyll b,chlorophyll a /b,chlorophyll and carotenoid content ＇Meihong Jianyeqing＇ 〉＇Dongyan Zihong＇ 〉＇Daye Meihong＇;but carotenoid/chlorophyll and anthocyanin content was on the contrary.