濒危植物大花黄牡丹光合特性及日进程研究  

Study on Photosynthetic Characteristics and Diurnal Course of the Endangered Species Paeonia ludlowii

作　　者：权红[1] 兰小中[1] 

机构地区：[1]西藏大学农牧学院,西藏林芝860000

出　　处：《种子》2013年第5期29-32,38,共5页Seed

基　　金：国家科技支撑计划(编号:2011BAI13B06);国家中医药管理局公共卫生专项(编号:20120716-540000)

摘　　要：采用目前最为先进的光合作用测定系统Li-cor-6400测定珍稀、濒危物种大花黄牡丹的光合作用特性和日进程,自然环境条件下的大花黄牡丹光合速率表现为单峰型曲线,在11:30时达到最高峰[12.560μmol/(m2.s)],其光合作用不存在"午休"现象。在12:30时,大花黄牡丹的气孔限制值(0.410)和水分饱和亏缺(2.960 kPa)分别达到最大值,此时的水分利用效率并不高(1.821μmol/mmol),在10:30时水分利用效率达到最大值(8.339μmol/mmol)。在10:30时,大花黄牡丹获得1 d中最大的表观量子效率(0.050),其蒸腾速率在12:30时最大[5.135 mmol/(m2.s)],这个时间并不与光合速率最大值同步,这说明在西藏特殊的气候环境条件下,影响光合速率的因素很多。在大花黄牡丹的光合速率日进程中,维持高光合速率值[大于4.00μmol/(m2.s)]的时间很长,大约9 h,这使得大花黄牡丹能有效的积累光合作用产物,这也说明大花黄牡丹是一种喜光植物。通过对大花黄牡丹的光合作用特征及日进程研究,为以后的毛茛科芍药属药用(或观赏)植物驯化提供了科学依据。In this research, the most advanced system for portable photosynthesis system-Li-cor-6400 was used in Paeonia ludlowii which was one kind of rare and endangered species. The diurnal course of net photosynthetic rate of P. ludlowii showed a single peak in natural environment conditions, which reached a peak at 11：30 O＇clock. There existed no ＂midday depression＂ in its photosynthesis. At 12：30 O＇clock,the value of stoma limitation and water pressure saturation deficits of leaf reached their peaks, while water use efficiency was not high, with a highest value appearing at 10：30 O＇ clock. The maximum value of apparent quantum yield appeared at 10：30 O＇clock. However,the climax value of transpiration rate appearing at 12：30 O＇clock, was not coordinate in time with maximum value of photosynthetic rate, which showed that lots of factors affected photosynthetic rate of P. ludlowii under special climate factors in Tibet. In the diurnal course of photosynthetic rate of P. ludlowii, high value [ over 4.00/xmol/（ m2·s） ] had kept on for 9 hours or so, which was very easy for P. ludlowii to accumulate photosynthetic products, and it showed that P. ludlowii was a type of light plant. Generally, it offered scientific foundation for taming medical or ornamental plant of wild Ranunculaceae Paeonia by studying the photosynthetic characteristics and diurnal course of P. ludlowii.

关 键 词：大花黄牡丹 光合特性 光合有效辐射 水分利用效率 日进程 

分 类 号：S685.11[农业科学—观赏园艺]