雾培与基质栽培马铃薯的光合特性

Photosynthetic Characteristics of Potato in Aeroponics and Substrate Culture

试验以川芋56脱毒苗为试材,通过雾化和基质栽培方式研究结薯盛期的光合特性,得出以下结论:雾培条件下马铃薯光合有效辐射的利用范围大于基质栽培,对光的适应性更强。雾培的净光合速率和表观量子效率大于基质栽培,且雾化栽培在弱光和低CO2浓度条件下仍具有较强的光合能力,在较高光合有效辐射和较高CO2浓度条件下也能继续进行光合同化,表明雾培更有利于将光能转化为生物质能。雾培和基质栽培净光合速率的降低是受强光下光抑制的加强等非气孔限制因素的影响。雾化栽培下植株能更快的将气孔打开,蒸腾速率迅速增加,加快了水分运输,拉动光合产物的合成,从而使光合速率迅速增加。

The virus-free seedlings from the variety Chuanyu 5 potato,being as the trial material,were researched in the experiment that investigated the photosynthetic characteristics at the flourish tuberizing stage in both aeroponics and substrate culture.The results indicated that the potato utilizing range of photosynthetically active radiation was larger in aeroponics than in substrate culture.Furthermore,potato was more adapted to light.At the same time,under the aeroponics culture both the net photosynthetic rate and apparent quantum efficiency of potato were higher.And its photosynthetic ability was larger in weaker light or lower CO2 concentration.The photosynthesis proceeded in strong PAR and higher CO2 concentration,too.All findings suggested that aeroponics culture was more beneficial to light energy transforming into bio-energy.Pn decreasing was effected by non-stomatal limitation such as photoinhibiton increasing at strong photo radiation.Potato would open leaf stomata rapidly and transpiration also would become stronger in aeroponics culture,which would speed water transportation,promote photosynthesis,and enhance the photosynthetic rate.