Study on Adaptability of Datura stramonium and Datura stramonium var. tatual to Temperature

This study was conducted to investigate the temperature adaptability of Datura stramonium and D. stramonium var. tatual. Under 4 temperature levels,plantgrowth and pigment concentrations in leaves and stems were determined, and leaf anatomic structures of D. stramonium var. tatual and D. stramonium were analyzed. The results showed that the palisade tissue thickness/sponge tissue thickness,stomatal density and stomatal index values of D. stramonium var. tatual were significantly greater than D. stramonium; the chlorophyll content/carotenoid content in leaves of D. stramonium var. tatual increased at first and decreased then, while no regularity was found in leaves of D. stramonium; and the contents of anthocyanin,flavonoids, and total phenols in stems of D. stramonium var. tatual were significantly higher than those in stems of D. stramonium. The temperature adaptability of D.stramonium var. tatual is stronger than that of D. stramonium.

紫花曼陀罗幼苗中紫色异细胞分布特征及其形态建成影响条件的初步研究

应用植物显微技术观察了幼苗期紫花曼陀罗(Datura stramonium L.var.tatula Torrey)中紫色异细胞的分布及不同温度与光照下培养的紫花曼陀罗幼苗茎中紫色异细胞的形态和分布差异。结果:(1)紫花曼陀罗中紫色异细胞分布在茎与叶地上器官中,根中则不存在。(2)强光和高温下培养的紫花曼陀罗幼苗茎中紫色异细胞的颜色明显加深、透明度下降,细胞间隙减小;而弱光和低温下其形态特征表现与上述相反。(3)强光处理下紫色异细胞横切面积、纵切长度以及数量均显著增加(P<0.05);弱光下该异细胞横切面积、纵切长度均显著减少(P<0.05),但数量显著增加(P<0.05)。(4)高温处理下紫色异细胞横切面积、纵切长度以及数量均显著增加(P<0.05);低温下该异细胞仅数量显著增加(P<0.05),其横切面积、纵切长度虽减小但变化差异性不显著(P<0.05)。结论:紫花曼陀罗中紫色异细胞的形态建成受光照和温度影响,曼陀罗(Datura stramonium L.)变种紫花曼陀罗(D.stramonium L.var.tatula Torrey)各营养器官中进化出紫色异细胞对其更好地适应光照和温度等生态环境变化有积极作用。

曼陀罗及其变种紫花曼陀罗的形态性状比较研究

对曼陀罗与其变种紫花曼陀罗的生长特性进行了比较观察,结果表明:曼陀罗花白色,叶柄较长,叶片较宽,叶边缘齿数较多,叶面积较大,单株结实少,花丝着生位置偏花冠下部,而紫花曼陀罗叶柄较短、叶宽度小,叶长宽比大,叶边缘锯齿数少,茎粗,单株结实数多,果大,花长,花丝着丝点位置在花冠较高位,且抗逆性整体优于曼陀罗,这些形态差异特征可以作为曼陀罗与紫花曼陀罗的辅助分类依据。