Photosynthetica 2002, 40(2):209-213 | DOI: 10.1023/A:1021389506501

Characteristics of Photosynthetic Apparatus in Mn-Starved Maize Leaves

C. D. Jiang1, H. Y. Gao1, Q. Zou1
1 Shandong Agricultural University, Tai'an, Shandong, P.R. China

The effects of Mn-deficiency on CO2 assimilation and excitation energy distribution were studied using Mn-starved maize leaves. Mn-deficiency caused about 70 % loss in the photon-saturated net photosynthetic rate (PN) compared to control leaves. The loss of PN was associated with a strong decrease in the activity of oxygen evolution complex (OEC) and the linear electron transport driven by photosystem 2 (PS2) in Mn-deficienct leaves. The photochemical quenching of PS2 (qP) and the maximum efficiency of PS2 photochemistry (Fv/Fm) decreased significantly in Mn-starved leaves under high irradiance, implicating that serious photoinhibition took place. However, the 'high-energy' fluorescence quenching (qE) decreased, which was associated with xanthophyll cycle. The results showed that the pool of de-epoxidation components of the xanthophyll cycle was lowered markedly owing to Mn deficiency. Linear electron transport driven by PS2 de-creased significantly and was approximately 70 % lower in Mn-deficient leaves than that in control, indicating less trans-thylakoid pH gradient was built in Mn deficient leaves. We suggest that the decrease of non-radiative dissipation depending on xanthophyll cycle in Mn-starved leaves is a result of the deficiency of trans-thylakoid pH gradient.

Additional key words: chlorophyll fluorescence; net photosynthetic rate; photoinhibition; violaxanthin; violaxanthin de-epoxidase; xanthophyll cycle; Zea; zeaxanthin

Published: June 1, 2002  Show citation

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Jiang, C.D., Gao, H.Y., & Zou, Q. (2002). Characteristics of Photosynthetic Apparatus in Mn-Starved Maize Leaves. Photosynthetica, 40(2), 209-213. doi: 10.1023/A:1021389506501
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