EFFECTS OF SHADING ON THE PHOTOSYNTHETIC CHARACTERISTICS AND LIGHT USE EFFICIENCY OF PHELLODENDRON AMURENSE SEEDLINGS

doi:10.3773/j.issn.1005-264x.2009.05.020

Abstract

Abstract:

Aims Although Phellodendron amurense is generally recognized as a shade-intolerant tree species, it has been reported to have some shade tolerance and be able to regenerate in both full sunshine and shade in New York, USA, where it is invasive. Our objective was to investigate shade tolerance of P. amurense.
Methods We planted 2-year-old P. amurense seedlings in two plantation plots, one with full natural light and the other with 15% of full natural light. After one year we observed the parameters of gas exchang, including maximum net photosynthetic rate (P_max), apparent quantum yield (AQY), dark respiration rate (R_d), light compensation point (LCP) and light use efficiency (LUE), using a Li-6400 (Li-Cor, USA). We also determined chlorophyll (Chl) contents per unit leaf area and per unit mass and specific leaf weight (SLW).
Important findings There were no significant differences (p>0.05) between sun and shade treatments for P_max, AQY and R_d. However, plants in the shade treatment had significantly lower LCP and SLW, but higher Chl content per unit mass and leaf area. These results indicated that P. amurense seedlings effectively used weak light by decreasing LCP and R_d, and enhanced the ability of capturing light by decreasing SLW and increasing leaf area and relative content of chlorophyll b, which made LUE increase in weak light condition. Therefore, P. amurense seedlings are shade tolerant.

Key words: Phellodendron amurense, shade tolerance, secondary forest, photosynthesis

WANG Kai, ZHU Jiao-Jun, YU Li-Zhong, SUN Yi-Rong, CHEN Guang-Hua. EFFECTS OF SHADING ON THE PHOTOSYNTHETIC CHARACTERISTICS AND LIGHT USE EFFICIENCY OF PHELLODENDRON AMURENSE SEEDLINGS[J]. Chin J Plant Ecol, 2009, 33(5): 1003-1012.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2009.05.020

https://www.plant-ecology.com/EN/Y2009/V33/I5/1003

Figures/Tables 6

References 38

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	春季 Spring		夏季 Summer		秋季 Autumn
	自然光 Natural light	遮阴 Shade	自然光 Natural light	遮阴 Shade	自然光 Natural light	遮阴 Shade
最大光合速率 Maximum net photosynthetic rate (P_max) (μmol·m^-2·s^-1)	18.52±1.57^a	14.81±0.65^a	17.39±0.37^a	13.89±1.13^a	18.46±1.71^a	17.61±1.36^a
表观量子效率 Apparent quantum yield (AQY) (mol·mol^-1)	0.079±0.007^a	0.060±0.003^a	0.074±0.009^a	0.077±0.008^a	0.048±0.007^a	0.074±0.004^a
暗呼吸速率 Dark respiration rate (R_d) (μmol·m^-2·s^-1)	1.601±0.006^a	1.400±0.092^a	3.194±0.134^a	2.423±0.292^a	1.614±0.310^a	0.944±0.123^a
光补偿点 Light compensation point (LCP) (μmol·m^-2·s^-1)	30.49±0.32^a	25.58±0.67^b	70.69±3.55^a	42.45±2.89^b	32.31±2.88^a	15.08±1.99^b

	春季 Spring		夏季 Summer		秋季 Autumn
	自然光 Natural light	遮阴 Shade	自然光 Natural light	遮阴 Shade	自然光 Natural light	遮阴 Shade
最大光合速率 Maximum net photosynthetic rate (P_max) (μmol·m^-2·s^-1)	18.52±1.57^a	14.81±0.65^a	17.39±0.37^a	13.89±1.13^a	18.46±1.71^a	17.61±1.36^a
表观量子效率 Apparent quantum yield (AQY) (mol·mol^-1)	0.079±0.007^a	0.060±0.003^a	0.074±0.009^a	0.077±0.008^a	0.048±0.007^a	0.074±0.004^a
暗呼吸速率 Dark respiration rate (R_d) (μmol·m^-2·s^-1)	1.601±0.006^a	1.400±0.092^a	3.194±0.134^a	2.423±0.292^a	1.614±0.310^a	0.944±0.123^a
光补偿点 Light compensation point (LCP) (μmol·m^-2·s^-1)	30.49±0.32^a	25.58±0.67^b	70.69±3.55^a	42.45±2.89^b	32.31±2.88^a	15.08±1.99^b

	春季 Spring		夏季 Summer		秋季 Autumn
	自然光 Natural light	遮阴 Shade	自然光 Natural light	遮阴 Shade	自然光 Natural light	遮阴 Shade
单位干重叶绿素含量 Chlorophyll content per mass (Chl_mass) (mg·g^-1)	5.60±0.10^a	17.72±0.38^b	7.33±0.17^a	13.28±0.12^b	5.73±0.09^a	14.0±0.16^b
单位面积叶绿素含量 Chlorophyll content per area (Chl_area) (g·m^-2)	0.2627±0.0045^a	0.4142±0.0088^a	0.4323±0.0099^a	0.4186±0.0039^a	0.3457±0.0056^a	0.4469±0.0051^a
叶绿素a/b值 Chlorophyll a/b (Chl a/b)	3.40±0.13^a	2.35±0.04^b	6.82±0.07^a	4.08±0.14^b	5.82±0.14^a	4.19±0.03^b
类胡萝卜素含量 Carotenoid content (Car) (g?m^-2)	0.0523±0.0011^a	0.0454±0.0010^b	0.1176±0.0039^a	0.0765±0.0011^b	0.0911±0.0026^a	0.0799±0.0010^a
类胡萝卜素/叶绿素比值 Chlorophyll/Carotenoid (Car/Chl)	0.1989±0.0012^a	0.1098±0.0039^b	0.2720±0.035^a	0.1827±0.0010^b	0.2635±0.0033^a	0.1787±0.0005^b

	春季 Spring		夏季 Summer		秋季 Autumn
	自然光 Natural light	遮阴 Shade	自然光 Natural light	遮阴 Shade	自然光 Natural light	遮阴 Shade
单位干重叶绿素含量 Chlorophyll content per mass (Chl_mass) (mg·g^-1)	5.60±0.10^a	17.72±0.38^b	7.33±0.17^a	13.28±0.12^b	5.73±0.09^a	14.0±0.16^b
单位面积叶绿素含量 Chlorophyll content per area (Chl_area) (g·m^-2)	0.2627±0.0045^a	0.4142±0.0088^a	0.4323±0.0099^a	0.4186±0.0039^a	0.3457±0.0056^a	0.4469±0.0051^a
叶绿素a/b值 Chlorophyll a/b (Chl a/b)	3.40±0.13^a	2.35±0.04^b	6.82±0.07^a	4.08±0.14^b	5.82±0.14^a	4.19±0.03^b
类胡萝卜素含量 Carotenoid content (Car) (g?m^-2)	0.0523±0.0011^a	0.0454±0.0010^b	0.1176±0.0039^a	0.0765±0.0011^b	0.0911±0.0026^a	0.0799±0.0010^a
类胡萝卜素/叶绿素比值 Chlorophyll/Carotenoid (Car/Chl)	0.1989±0.0012^a	0.1098±0.0039^b	0.2720±0.035^a	0.1827±0.0010^b	0.2635±0.0033^a	0.1787±0.0005^b