EFFECTS OF NITROGEN AND PHOSPHOROUS LEVELS ON GROWTH AND PHOTOSYNTHETIC TRAITS OF GRACILARIA LEMANEIFORMIS (RHODOPHYTA)

doi:10.3773/j.issn.1005-264x.2009.06.014

Abstract

Abstract:

Aim Our objective was to investigate the impacts of different nutrient levels on the physiology of Gracilaria lemaneiformis to evaluate the relationship between this mariculture species and costal environment.
Methods Thalli of Gracilaria lemaneiformis were cultured for 15 days under four different nutrient conditions (low N and low P, low N and high P, high N and low P, and high N and high P) to examine the possible effects of the availability of different nutrients on growth and photosynthesis in this alga.
Important findings Growth of G. lemaneiformis was enhanced with the low N and high P treatment, high N and low P treatment, and high N and high P treatment, compared to low N and low P treatment. The highest relative growth rate (RGR) and biomass were observed under high N and high P treatment.Gracilaria lemaneiformiswas capable of using HCO₃^-as a source of exogenous inorganic carbon (Ci) for its photosynthesis, and the ability was increased at the above three nutrient conditions. Both carbon-saturated photosynthetic rate and apparent half saturation constant under high N and high P treatment were significant higher than those under low N and low P treatment by 118% and 48.71%, respectively. Photochemical efficiency of G. lemaneiformis was stimulated with low N and high P treatment, but was inhibited at the two high N treatments. Thus, the rates of growth and photosynthesis were the highest, but the photochemical efficiency was the lowest inG. lemaneiformis grown under high N and high P treatment.

Key words: Gracilaria lemaneiformis, nitrogen, phosphorus, growth, photosynthesis, photochemical efficiency

LI Feng, ZOU Ding-Hui, LIU Zhao-Pu, ZHAO Geng-Mao, CHENG Li-Wei, ZHU Xi-Feng, CHEN Wei-Zhou. EFFECTS OF NITROGEN AND PHOSPHOROUS LEVELS ON GROWTH AND PHOTOSYNTHETIC TRAITS OF GRACILARIA LEMANEIFORMIS (RHODOPHYTA)[J]. Chin J Plant Ecol, 2009, 33(6): 1140-1147.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2009.06.014

https://www.plant-ecology.com/EN/Y2009/V33/I6/1140

Figures/Tables 5

Fig. 1 Relative growth rate (RGR) and productivity of Gracilaria lemaneiformis under different nutrients treatments

Fig. 2 Rates of photosynthetic oxygen evolution vs. inorganic carbon concentration curves of Gracilaria lemaneiformis under different nutrients treatments

Table 1 Kinetic parameters in the curves of rates of photosynthetic oxygen evolution vs. Ci concentration of Gracilaria lemaneiformis under different nutrients treatments

动力学参数		LNLP		LNHP		HNLP		HNHP
无机碳饱和光合速率 Carbon-saturating maximum photosynthetic rate (V_max) (μmol O₂·g^-1FW·h^-1)		29.88±8.55^a		51.34±2.88^bc		43.28±6.15^ac		65.23±12.11^b
表观半饱和常数 The concentration of inorganic carbon (K_m) (mmol·L^-1)		3.49±1.12^a		4.15±0.44^ab		2.96±0.27^a		5.19±0.99^b

Fig. 3 Photochemical efficiency of Gracilaria lemaneiformis under different nutrients treatments

Table 2 Photosynthetic parameters in the curves of relative electron transport rates (rETR) vs. irradiance of Gracilaria lemaneiformis under different nutrients treatments

光合参数	LNLP	LNHP	HNLP	HNHP
最大电子传递速率 Maximum roelative electron transfer rate (rETR_max)	89.15±4.31^a	92.78±4.89^a	84.64±4.46^a	53.68±2.93^b
光能利用效率 Photosynthetic efficiency (α)	0.136±0.024^a	0.160±0.011^a	0.140±0.001^a	0.131±0.041^a

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