论文部分内容阅读
试验设置4个CO2浓度(温室内未增施的CO2浓度约450μmol/mol,低、中、高CO2增施浓度分别为(700±50)、(1 000±50)、(1 300±50)μmol/mol)和3个水分条件(低、中、高基质含水率分别为基质饱和含水率的35%~45%、55%~65%、75%~85%)的交互处理。结果表明,增施1 000、1 300μmol/mol CO2能提升番茄叶片的净光合速率并可促使植株提早6~11 d开花;中水条件下,CO2增施组比未增施组的表观量子效率(AQY)、表观羧化效率(ACE)显著上升,光补偿点显著降低;高CO2浓度下,中水、高水组植株的最大净光合速率和表观量子效率显著高于低水组,同时光补偿点和CO2补偿点低于低水组;低水条件下CO2增施组植株叶片的丙二醛(MDA)含量降低,表明增施CO2可以在一定程度上缓解不利水分条件对番茄植株造成的氧化损伤;增施CO2条件下低水组比未增施条件下中水组植株的开花时间提前3~7 d、第一穗果鲜质量增加18%~44%,1 000、1 300μmol/mol CO2增施条件下中水组比未增施条件下高水组植株的开花时间分别提前8、10 d,第一穗果鲜质量分别增加42.8%、34.0%,表明CO2增施能提高番茄第一穗果鲜质量水平上的水分利用效率。
Four CO2 concentrations were set in the experiment (the un-applied CO2 concentration was about 450 μmol / mol in the greenhouse, the concentrations of low, medium and high CO2 were (700 ± 50), (1 000 ± 50) and (1 300 ± 50) μmol / mol) and three water conditions (low, medium and high substrate moisture were 35% -45%, 55% -65%, 75% -85% of the saturated water content of the substrate). The results showed that increasing 1000, 300μmol / mol CO2 could promote the net photosynthetic rate of tomato leaves and promote the flowering of plants 6 ~ 11 days earlier. Under the condition of medium water, the apparent quantum yield (AQY), apparent carboxylation efficiency (ACE) increased significantly and light compensation point decreased significantly. Under high CO2 concentration, the maximum net photosynthetic rate and apparent quantum yield of plants in medium water and high water were significantly higher than those in low water , While the light compensation point and CO2 compensation point were lower than those in the low-water group. Under low water conditions, the content of malondialdehyde (MDA) in the leaves of CO2-deficient plants decreased, indicating that CO2 could alleviate the adverse effects of adverse water conditions on tomato The oxidative damage caused by plants was accelerated 3 to 7 days ahead of flowering in the medium-water-treated group under the condition of low-water-supplemented CO2 and the fresh-weight of first-tassel increased by 18% -44% The flowering time of the high-water-treated plants increased by 8 and 10 days respectively under the condition of 300μmol / mol CO2 enrichment, and the fresh weight of the first fruits increased by 42.8% and 34.0% respectively, indicating that the increase of CO2 energy Improve the water use efficiency of fresh weight level of the first ear of tomato.