[Chlorophyll content and net photosynthetic rate of Machilus pauhoi and M. leptophylla].
By using SPAD-502 chlorophyll meter, LI-6400 portable photosynthesis system, and spectrophotometer, the leaf SPAD value, net photosynthetic rate (Pn), and chlorophyll (a + b) content (Ct) of 3-year-old Machilus pauhoi and M. leptophylla seedlings were measured, and the relationships of SPAD value with Pn and Ct were analyzed. The M. pauhoi seedlings were grown from the seeds originated from Suichuan County of Jiangxi Province and Jian'ou County of Fujian Province, named as MPS and MPJ, respectively; while the M. leptophylla seedlings were grown from the seeds originated from Shangyou County of Jiangxi Province, named as MLG. There were significant differences in the mean chlorophyll content of MPS, MPJ, and MLG. The SPAD value and the contents of chlorophyll (a + b) (Ct), chlorophyll a (Ca) and chlorophyll b (Cb) were in the order of MPS < MLG < MPJ, with the mean SPAD value being 43.80, 45.12, and 50.67 and the Ct value being 1.944, 2.831, and 3.447 mg c g(-1), respectively. The chlorophyll content was influenced by the maturing degree of mesophyll tissues of M. pauhoi and M. leptophylla, being lower in current-year leaves than in 2-year-old leaves. The Ct of same age leaves at different crown layers of MPS and MPJ and of MLG was in the order of upper layer < middle layer < lower layer and of upper layer < lower layer < middle layer, respectively, and the SPAD value of the same lamina at different positions was in the order of apex < middle < base. SPAD value had a significant positive linear correlation with Ct, and a statistically not significant positive correlation with Pn.
Zhong
Quan-Lin
QL
Fujian Provincial Key Laboratory of Subtropical Resources and Environment, College of Geography Science, Fujian Normal University, Fuzhou 350007, China. qlzhong@126.com
Cheng
Dong-Liang
DL
Hu
Song-Zhu
SZ
He
Li-Zhong
LZ
Tang
Cheng-Cai
CC
Wen
Ya-Xiang
YX
Qiu
Jian-Fei
JF
Li
Xiu-Hua
XH
D002681:China; D002734:Chlorophyll / Q000032:analysis*; D019770:Lauraceae / Q000737:chemistry* / Q000502:physiology*; D010788:Photosynthesis / Q000502:physiology*; D036226:Seedlings / Q000737:chemistry / Q000502:physiology
D002734:Chlorophyll