CAJ | 학술논문

采用2种典型的光响应模型对3个油葵品种KWS203、TH320及矮大头667DW叶片的光合-光响应曲线进行拟合,并分析其光合参数与油葵生物产量、籽粒产量的关系。结果表明：直角双曲线修正模型和非直角双曲线模型对3个油葵品种的光合-光响应曲线的拟合精度较高,拟合方程的决定系数均为R2≥0.997。其中直角双曲线修正模型可以更好地拟合KWS203和矮大头667DW光系统Ⅱ动力学下调或光抑制部分的光合-光响应曲线,可准确计算其饱和光照度及最大净光合速率,且与实际测量值相当接近。直角双曲线修正模型拟合3种油葵光合-光响应曲线所得的光合参数与产量关系表明,油葵产量与最大净光合速率和饱和光照度具有相关性,饱和光照度与其生物产量( r=0.971**)、籽粒产量( r=0.982**)的相关系数均为极显著差异水平,但最大净光合速率与其生物产量(r=0.309)、籽粒产量(r=0.344)的相关系数都未达到显著水平；TH320的最大净光合速率、饱和光照度均最大,为36.926μmol/(m2·s),CO2、2286.884μmol/(m2·s),其生物产量、籽粒产量也最高,分别为13664.25 kg/hm2、4711.81 kg/hm2。综上所述,直角双曲线修正模型更符合油葵的光合生理特征,是研究油葵光合-光响应曲线的首选模型；TH320相对于其他2个油葵品种,具有更高的光饱和点和最大净光合速率,更低的暗呼吸速率和光合产物消耗。
채용2충전형적광향응모형대3개유규품충KWS203、TH320급왜대두667DW협편적광합-광향응곡선진행의합,병분석기광합삼수여유규생물산량、자립산량적관계。결과표명：직각쌍곡선수정모형화비직각쌍곡선모형대3개유규품충적광합-광향응곡선적의합정도교고,의합방정적결정계수균위R2≥0.997。기중직각쌍곡선수정모형가이경호지의합KWS203화왜대두667DW광계통Ⅱ동역학하조혹광억제부분적광합-광향응곡선,가준학계산기포화광조도급최대정광합속솔,차여실제측량치상당접근。직각쌍곡선수정모형의합3충유규광합-광향응곡선소득적광합삼수여산량관계표명,유규산량여최대정광합속솔화포화광조도구유상관성,포화광조도여기생물산량( r=0.971**)、자립산량( r=0.982**)적상관계수균위겁현저차이수평,단최대정광합속솔여기생물산량(r=0.309)、자립산량(r=0.344)적상관계수도미체도현저수평；TH320적최대정광합속솔、포화광조도균최대,위36.926μmol/(m2·s),CO2、2286.884μmol/(m2·s),기생물산량、자립산량야최고,분별위13664.25 kg/hm2、4711.81 kg/hm2。종상소술,직각쌍곡선수정모형경부합유규적광합생리특정,시연구유규광합-광향응곡선적수선모형；TH320상대우기타2개유규품충,구유경고적광포화점화최대정광합속솔,경저적암호흡속솔화광합산물소모。
Two typical models of photosynthesis-light response curve were adopted to fit the photosynthesis-light re-sponse curves of three sunflower varieties(KWS203, TH320 and Aidatou 667DW), and to analyse the relationship between its photosynthetic parameters and biological yield and grain yield. The modified rectangular hyperbolic model and non-rectangular hyperbolic model could fit the photosynthesis-light response curves of the three sunflower varieties (R2>0. 997). The modified rectangular hyperbolic model could better fit the light response curves of PSII kinetics down-regulation or photoinhibition of KWS203 and Aidatou 667DW, accurately calculating its light saturation point and the maximum net photosynthetic rate which were quite close to the actual measured values. There were positive correlations between yields of sunflower and light saturation point, the correla-tion coefficient being 0. 971** for biological yield 0. 982** for grain yield. TH320 held the maximum net photosynthetic rate and light saturation point, and its biological yield and grain yield were the highest as well. In summary, the modified rectan-gular hyperbolic model is preferable to study the light response characteristics of sunflower. TH320 presented higher light sat-uration point and the maximum net photosynthetic rate, and a lower respiration rate and consumption of photosynthetic prod-ucts.