祁白芷光合特性和生长发育动态研究

通过对春播祁白芷的光合特性和农艺性状研究,明确两者与根干重的关系,并为祁白芷的合理栽培提供理论依据。从苗期开始每隔25 d测定1次光合特性和农艺性状。结果表明:在苗期叶绿素a、叶绿素b、叶绿素a+b和可溶性蛋白含量以及希尔反应、Ca2+-ATPase和Mg2+-ATPase的活性都有增加的趋势;到叶生长盛期含量或活性都最高;进入根生长盛期含量或活性逐渐下降。除气孔导度外,光合特性指标和根干重呈负相关,但是只有光合速率和Ca2+-ATPase活性与根干重达到显著负相关。根粗、叶干重、茎干重、地上干重、根冠比与根干重呈极显著正相关。祁白芷的营养生长期分为苗期、叶生长盛期和根生长盛期。地上部与地下部之间存在着明显的竞争关系,可以通过叶面积和茎粗来判断地下的长势。

Dynamic studies on photosynthetic and growth characteristics of Angecila dahurcia

Photosynthetic and growth characteristics of Angelica dahurica were studied in order to clarity the relations of photosynthesis, growth and root dry weight, and provide a theoretical basis for its cultivation. Photosynthesis and growth indexes were measured every 25 days. The contents of chlorophyll a, b, a+b, soluble protein and the activities of Hill reaction, Ca²⁺-ATPase, Mg²⁺-ATPase had an increasing trend; They had the highest value in leaf high-speed growth period. Then, they were decreased in root high-speed growth period. The root dry weight showed negative corelation with photosynthetic characteristics indexes except stomatal conductance, however, the negative corelation only from net photosynthetic rate and Ca²⁺-ATPase were significant. The vegetative growth period of spring sowing A. dahuricia was divided into three phases: seedling period, leaf high-speed growth period and root high-speed growth period. The root dry weight showed a significantly positive corelation with the root diameter, leaf dry weight, shoot dry weight, aboveground dry weight. There was the competitive relation between aboveground and underground, so underground growth could be estimated from leaf area and shoot dimeter.