2种株型丹参光合特性研究

通过研究直立型丹参和匍匐型丹参光合特性,为其合理栽培和优良品种选育提供依据。使用LI-6400便携式光合仪测定2种株型丹参光合速率对光强的响应曲线及光合日变化。结果表明,(1)匍匐型丹参光合符合典型喜阳植物的特点,光饱和点(LSP)高于直立型丹参,具有宽泛的光强适应性。(2)2种株型丹参均有光合午休的现象,类型为非气孔限制型。(3)环境因素的变化如温度、湿度等对匍匐型丹参光合参数的影响大于直立型丹参,直立型丹参表现出相对强的环境适应性。(4)合理的栽培条件下,匍匐型丹参的产量优于直立型丹参,增产约55%。匍匐型丹参可以作为进一步选育优良品种的材料。

Variation of Photosynthesis Characteristics in Two Kinds of Salvia miltiorrhiza

The erect type variety of Salvia miltiorrhiza and the creeping type were chosen to study their photosynthetic characteristics and provide good cultivation and breeding basis for them. Diurnal variation of photosynthesis and photosynthetic response of both types of Salvia miltiorrhiza were studied using the LI-6400 portable photosynthesis system. The results showed that: (1) the photosynthetic characteristics of the creeping type met the features of typical heliophilous plant, which had higher LSP and broader light adaptability; (2) both Salvia miltiorrhiza types had photosynthetic midday-depress, and the decrease of Pn was due to non-stomatal limitation; (3) changes of environmental factors like temperature and humidity would influence the photosynthetic characteristics of creeping type more than the erect type; the erect type of Salvia miltiorrhiza had stronger environmental adaptation than the creeping type; (4) the yield of the creeping type of Salvia miltiorrhiza was better than that of the erect type under good cultivation conditions, and the yield increase was around 55%. The creeping type could be a better breeding material.