State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China.
University of Chinese Academy of Sciences, Beijing, China.
J Sci Food Agric. 2018 Sep;98(12):4509-4516. doi: 10.1002/jsfa.8976. Epub 2018 Apr 14.
Elevated carbon dioxide (CO ) and nitrogen (N) availability can interactively promote cucumber yield, but how the yield increase is realized remains unclear, whilst the interactive effects on fruit quality are unknown. In this study, cucumber plants (Cucumis sativus L. cv. Jinmei No. 3) were grown in a paddy soil under three CO concentrations - 400 (ambient CO ), 800 (elevated CO , eCO ) and 1200 µmol mol (super-elevated CO ) - and two N applications - 0.06 (low N) and 0.24 g N kg soil (high N).
Compared with ambient CO , eCO increased yield by 106% in high N but the increase in total biomass was only 33%. This can result from greater carbon translocation to fruits from other organs, indicated by the increased biomass allocation from stems and leaves, particularly source leaves, to fruits and the decreased concentrations of fructose and glucose in source leaves. Super-elevated CO reduced the carbon allocation to fruits thus yield increase (71%). Additionally, eCO also increased the concentrations of fructose and glucose in fruits, maintained the concentrations of dietary fiber, phosphorus, potassium, calcium, magnesium, sulfur, manganese, copper, molybdenum and sodium, whilst it decreased the concentrations of nitrate, protein, iron, and zinc in high N. Compared with eCO , super-elevated CO can still improve the fruit quality to some extent in low N availability.
Elevated CO promotes cucumber yield largely by carbon allocation from source leaves to fruits in high N availability. Besides a dilution effect, carbon allocation to fruits, carbohydrate transformation, and nutrient uptake and assimilation can affect the fruit quality. © 2018 Society of Chemical Industry.
升高的二氧化碳（CO ）和氮（N）供应可以相互促进黄瓜的产量，但产量增加的机制尚不清楚，而其对果实品质的互作效应也尚不清楚。在本研究中，黄瓜（Cucumis sativus L. cv. Jinmei No. 3）植株在稻田土壤中于三种 CO 浓度下生长-400（大气 CO ）、800（升高的 CO ，eCO ）和 1200µmol mol（超升高的 CO ）-和两种 N 应用-0.06（低 N）和 0.24 g N kg 土壤（高 N）。
与大气 CO 相比，高 N 下 eCO 使产量增加了 106%，但总生物量仅增加了 33%。这可能是由于更多的碳从其他器官转移到果实，这表现为茎和叶特别是源叶向果实的生物量分配增加，以及源叶中果糖和葡萄糖浓度降低。超升高的 CO 减少了向果实的碳分配，从而导致产量增加（71%）。此外，eCO 还增加了果实中果糖和葡萄糖的浓度，维持了膳食纤维、磷、钾、钙、镁、硫、锰、铜、钼和钠的浓度，而在高 N 下降低了硝酸盐、蛋白质、铁和锌的浓度。与 eCO 相比，超升高的 CO 仍能在低 N 供应下在一定程度上改善果实品质。
在高 N 供应下，升高的 CO 主要通过源叶到果实的碳分配来促进黄瓜的产量。除了稀释效应外，碳向果实的分配、碳水化合物的转化、养分的吸收和同化也会影响果实的品质。 © 2018 英国化学学会。
