CAJ | 학술논문

研究不同营养盐条件对龙须菜(Gracilaria lemaneiformis)的生理效应,对深入了解龙须菜与近海环境的相互作用具有重要意义.在低氮低磷(LNLP)、低氮高磷(LNHP)、高氮低磷(HNLP)和高氮高磷(HNaP)4种营养盐条件下培养龙须菜15 d,以探讨不同氮、磷水平对龙须菜生长和光合特性的影响.结果表明:1)LNHP、HNLP和HNHP处理促进了龙须菜的生长,其中HNHP处理下龙须菜具有最大的相对生长速率和生物量;2)LNHP、HNLP和HNHP处理提高了龙须菜的光合无机碳利用能力,其中HNHP处理下龙须菜具有最大的无机碳饱和光合速率和表观半饱和常数,比LNLP处理分别提高了118%倍和48.71%;3)LNHP、HNLP和HNHP处理显著影响龙须菜的光化学效率,与LNLP处理相比,LNHP处理提高了龙须菜的光化学效率,而HNLP和HNHP处理降低了龙须菜的光化学效率.研究结果表明,HNHP处理条件下,龙须菜的生长和光合无机碳利用能力最高,光化学效率最低.
연구불동영양염조건대룡수채(Gracilaria lemaneiformis)적생리효응,대심입료해룡수채여근해배경적상호작용구유중요의의.재저담저린(LNLP)、저담고린(LNHP)、고담저린(HNLP)화고담고린(HNaP)4충영양염조건하배양룡수채15 d,이탐토불동담、린수평대룡수채생장화광합특성적영향.결과표명:1)LNHP、HNLP화HNHP처리촉진료룡수채적생장,기중HNHP처리하룡수채구유최대적상대생장속솔화생물량;2)LNHP、HNLP화HNHP처리제고료룡수채적광합무궤탄이용능력,기중HNHP처리하룡수채구유최대적무궤탄포화광합속솔화표관반포화상수,비LNLP처리분별제고료118%배화48.71%;3)LNHP、HNLP화HNHP처리현저영향룡수채적광화학효솔,여LNLP처리상비,LNHP처리제고료룡수채적광화학효솔,이HNLP화HNHP처리강저료룡수채적광화학효솔.연구결과표명,HNHP처리조건하,룡수채적생장화광합무궤탄이용능력최고,광화학효솔최저.
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 lemaneiformis was capable of using HCO_3~- 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 in G. lemaneiformis grown under high N and high P treatment.