Ivanov A G, Krol M, Maxwell D, Huner N P
Institute of Biophysics, Bulgarian Academy of Sciences, Sofia.
FEBS Lett. 1995 Aug 28;371(1):61-4. doi: 10.1016/0014-5793(95)00872-7.
The exogenous application of abscisic acid (ABA) to barely seedlings resulted in partial protection of the PSII photochemistry against photoinhibition at low temperature, the effect being most pronounced at 10(-5) M ABA. This was accompanied by higher photochemical quenching (qP) in ABA-treated leaves. A considerable increase (122%) in the amount of total carotenoids and xanthophylls (antheraxanthin, violaxanthin and zeaxanthin) was also found in the seedlings subjected to ABA. The activity of the xanthophyll cycle measured by the epoxidation state of xanthophylls under high-light treatment was higher in ABA-treated plants compared with the control. This corresponds to a higher value (0.411) of non-photochemical quenching (qNP) observed in ABA-treated than in control (0.306) leaves.
对外源脱落酸（ABA）处理大麦幼苗的研究发现，其可在低温条件下对PSII光化学起到部分保护作用，从而抵御光抑制，这种效果在10(-5) M ABA浓度时最为显著。ABA处理的叶片具有更高的光化学猝灭（qP）。此外，经ABA处理的幼苗中总类胡萝卜素和叶黄素（花药黄质、紫黄质和玉米黄质）含量显著增加（122%）。在高光处理下，通过叶黄素环氧化状态测定的叶黄素循环活性在ABA处理的植株中高于对照。这与ABA处理叶片中观察到的非光化学猝灭（qNP）值较高（0.411）相对应，而对照叶片中的该值为0.306。
