College of Horticulture, Northwest Agriculture & Forest University, Yangling, 712100, Shaanxi, China.
College of Horticulture Science and Engineering, Shandong Agricultural University, Taian, 271018, Shandong, China.
Sci Rep. 2019 Jun 18;9(1):8700. doi: 10.1038/s41598-019-45232-w.
The high vapor pressure deficit (VPD) in some arid and semi-arid climates creates undesirable conditions for the growth of tomato plants (Solanum lycopersicum L., cv. Jinpeng). The global CO concentration ([CO]) has also risen in recent years to levels above 400 μmol·mol. However, the coordinated effect of VPD and [CO] on tomato plant growth remains unclear, especially at VPDs of 5-6 kPa or even higher that are extremely detrimental to plant growth. Here, we explore the interaction of VPD and [CO] on plant water status, stomatal characteristics, and gas exchange parameters in summer greenhouses in a semi-arid area. Plants were grown in four adjacent glass greenhouses with different environmental conditions: (i) high VPD + low [CO] representing natural/control conditions; (ii) high VPD + high [CO] representing enriched CO; (iii) low VPD + low [CO] representing reduced VPD; and (iv) low VPD + high [CO] representing reduced VPD and enriched CO. Reducing the VPD alleviated the water stress of the plant and increased the gas exchange area of the leaf, which was beneficial to the entry of CO into the leaf. At this time, the increase of [CO] was more beneficial to promote the photosynthetic rate and then improve the water use efficiency and yield.
在一些干旱和半干旱气候中，高蒸汽压差（VPD）为番茄植株（Solanum lycopersicum L.，cv. Jinpeng）的生长创造了不理想的条件。近年来，全球 CO2 浓度 ([CO2]) 也上升到了 400 μmol·mol 以上的水平。然而，VPD 和 [CO2] 对番茄植株生长的协同影响尚不清楚，尤其是在对植物生长极为不利的 5-6 kPa 甚至更高的 VPD 下。在这里，我们在半干旱地区的夏季温室中探索了 VPD 和 [CO2] 对植物水分状况、气孔特征和气体交换参数的相互作用。在四个具有不同环境条件的相邻玻璃温室内种植植物：（i）高 VPD + 低 [CO2] 代表自然/对照条件；（ii）高 VPD + 高 [CO2] 代表富 CO2；（iii）低 VPD + 低 [CO2] 代表降低 VPD；和（iv）低 VPD + 高 [CO2] 代表降低 VPD 和富 CO2。降低 VPD 缓解了植物的水分胁迫并增加了叶片的气体交换面积，这有利于 CO2 进入叶片。此时，[CO2] 的增加更有利于促进光合作用，从而提高水分利用效率和产量。
