J Integr Plant Biol. ›› 1993, Vol. 35 ›› Issue (Suppl.): -.

• Research Articles •    

Effect of Light and Antioxidants on Fluoreseence Qucnching of Chlorophyll in Maize Leaves under Water Stress

Chen Yi-zhu,Li Shuang-sun and Lin Zhi-fang   

Abstract: hlorophyll fluorescence in PS II of the leaves of maize (Zea mays L. ) seedlings under stress was measured with a newly developed pulse modulation fluorometer. Water stress had no effect on the initial fluorescence (Fo) but slightly inhibited the maximum fluorescence (Fm), variable fluorescence(Fv), Photochemical efficiency (Fv/Fm) and the effective activity of PS Ⅱ (Fv/Fo). In the first minute of saturated flash, some changes in photochemical quenching (qp) occurred. However, when leaves that had been subjected to water stress were illuminated again with intense light (1100 μmol · m-2· s-1) for 30 min, fluorescence yield, fluorescence kinetics, photochemical and non-photochemical quenching(qE) all changed significantly. Pretreatment of the leaves with scavengers of activated oxygen butylated hydroxytoluene (BHT), ascorbic acid(ASA) and 6-BA could change to a certain extent the effect of water stress on Q-quenching and E-quenching. It might be concluded that: (1) light enhanced the damage of water stress on photosynthetic apparatus; and (2) such damage could be relieved by ASA and 6-BA.

Key words: Zea mays, Water stress, Antioxidant, Chlorophyll fluorescence

Editorial Office, Journal of Integrative Plant Biology, Institute of Botany, CAS
No. 20 Nanxincun, Xiangshan, Beijing 100093, China
Tel: +86 10 6283 6133 Fax: +86 10 8259 2636 E-mail: jipb@ibcas.ac.cn
Copyright © 2022 by the Institute of Botany, the Chinese Academy of Sciences
Online ISSN: 1744-7909 Print ISSN: 1672-9072 CN: 11-5067/Q