Ahmadi-Lahijani Mohammad Javad, Kafi Mohammad, Nezami Ahmad, Nabati Jafar, Erwin John E
Department of Agrotechnology, Faculty of Agriculture, Ferdowsi University of Mashhad, P.O. Box 91779-48974, Mashhad, Iran.
Research Centre of Plant Sciences, Ferdowsi University of Mashhad, Mashhad, Iran.
Physiol Mol Biol Plants. 2021 Feb;27(2):313-325. doi: 10.1007/s12298-021-00956-w. Epub 2021 Feb 19.
Elevated CO interactions with other factors affects the plant performance. Regarding the differences between cultivars in response to CO concentrations, identifying the cultivars that better respond to such conditions would maximize their potential benefits. Increasing the ability of plants to benefit more from elevated CO levels alleviates the adverse effects of photoassimilate accumulation on photosynthesis and increases the productivity of plants. Despite its agronomic importance, there is no information about the interactive effects of elevated CO concentration and plant growth regulators (PGRs) on potato ( L.) plants. Hence, the physiological response and source-sink relationship of potato plants (. Agria and Fontane) to combined application of CO levels (400 vs. 800 µmol mol) and plant growth regulators (PGR) [6-benzylaminopurine (BAP) + Abscisic acid (ABA)] were evaluated under a controlled environment. The results revealed a variation between the potato cultivars in response to a combination of PGRs and CO levels. Cultivars were different in leaf chlorophyll content; Agria had higher chlorophyll a, b, and total chlorophyll content by 23, 43, and 23%, respectively, compared with Fontane. The net photosynthetic rate was doubled at the elevated compared with the ambient CO. In Agria, the ratio of leaf intercellular to ambient air CO concentrations [C:C] was declined in elevated-CO-grown plants, which indicated the stomata would become more conservative at higher CO levels. On the other hand, the increased C:C in Fontane showed a stomatal acclimation to higher CO concentration. The higher leaf dark respiration of the elevated CO-grown and BAP + ABA-treated plants was associated with a higher leaf soluble carbohydrates and starch content. Elevated CO and BAP + ABA shifted the dry matter partitioning to the belowground more than the above-media organs. The lower leaf soluble carbohydrate content and greater tuber yield in Fontane might indicate a more efficient photoassimilate translocation than Agria. The results highlighted positive synergic effects of the combined BAP + ABA and elevated CO on tuber yield and productivity of the potato plants.
高浓度二氧化碳与其他因素的相互作用会影响植物的生长表现。关于不同品种对二氧化碳浓度响应的差异，识别出对这种条件响应更好的品种将使其潜在益处最大化。提高植物从高浓度二氧化碳水平中更多获益的能力，可减轻光合产物积累对光合作用的不利影响，并提高植物的生产力。尽管其在农学上具有重要意义，但关于高浓度二氧化碳与植物生长调节剂（PGRs）对马铃薯（L.）植株的交互作用尚无相关信息。因此，在可控环境下评估了马铃薯植株（. Agria和Fontane）对二氧化碳水平（400对800 μmol mol）和植物生长调节剂（PGR）[6-苄基腺嘌呤（BAP）+脱落酸（ABA）]组合施用的生理响应及源库关系。结果显示，马铃薯品种对PGR和二氧化碳水平组合的响应存在差异。品种间叶片叶绿素含量不同；与Fontane相比，Agria的叶绿素a、b和总叶绿素含量分别高出23%、43%和23%。与环境二氧化碳浓度相比，高浓度二氧化碳下净光合速率翻倍。在Agria中，高浓度二氧化碳处理的植株叶片细胞间隙与外界空气二氧化碳浓度之比[C:C]下降，这表明在较高二氧化碳水平下气孔会变得更加保守。另一方面，Fontane中C:C的增加表明气孔适应了更高的二氧化碳浓度。高浓度二氧化碳处理和BAP + ABA处理的植株叶片暗呼吸较高，这与叶片可溶性碳水化合物和淀粉含量较高有关。高浓度二氧化碳和BAP + ABA使干物质分配向地下部分转移的程度超过地上部分器官。Fontane较低的叶片可溶性碳水化合物含量和较高的块茎产量可能表明其光合产物转运比Agria更高效。结果突出了BAP + ABA与高浓度二氧化碳组合对马铃薯植株块茎产量和生产力的积极协同效应。
