鲁西地区六个山药地方品种光合特性比较研究

Study on Photosynthetic Characteristics of Several Indigenous Yam Varieties in the West of Shandong Province

以鲁西地区"明豆子"、"西施种子"、"鸡皮糙"、"大白玉"、"大和玉"和"九斤黄"6个山药地方品种为试材,对叶片光净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、胞间二氧化碳浓度(Ci)等生理因子进行了测定,并对Pn、Tr的日变化趋势,以及Pn与Tr、Gs、Ci的相关性进行了分析。结果表明:所有品种的Pn日变化均呈典型的双峰型曲线,首峰出现在10:00左右,次峰出现在14:00左右,有明显的"午休"现象;Tr呈现单峰曲线,最大值出现在14:00左右。通过相关性分析发现,"西施种子"、"大白玉"和"大和玉"3个品种的Pn与Gs呈显著的正相关,与Ci呈显著的负相关;"明豆子"Pn与Gs呈极显著的正相关;"鸡皮糙"品种的Pn与Tr呈显著正相关。

Taking 6 indigenous yam varieties in the west of Shandong province, that were ＇Mingdoizi＇,＇ Xishizhongzi＇, ＇J ipieao ＇, ＇ Dabaiyu ＇, ＇ Daheyu ＇, ＇Jiujinhuang＇ as materials, net photosynthetic rate （Pn）, transpiration rate （Tr）, stomatal conductance （Gs） and intercellular carbon dioxide concentration （Ci） were determined. Then the daily variation trend of Pn and Tr ,the correlation between Pn and Tr ,Gs,Ci were analyzed. The results showed that the daily variation trend of Tr manifested as a single-peak curve,with the peak value at 14：00. But that of Pn manifested as a typical double-peak curve,and the first peak appeared at about 10： 00, the second at about 14 .. 00. In the variation curve, a obvious ＇ Midday depression＇phenomenon could be observed. Through correlation analysis, it found that there was a significant positive correlation between Pn and Gs, but a significant negative correlation between Pn and Ci in the three varieties of ＇ Xishizhongzi＇,＇ Dabaiyu ＇ and ＇ Daheyu＇. Meanwhile, the Pn of ＇ Mingdouzi ＇ had an extremely positive correlation with Gs,and the Pn of ＇Jipizao＇ had positive correlation with Tr.