期刊
ANTIOXIDANTS
卷 10, 期 7, 页码 -出版社
MDPI
DOI: 10.3390/antiox10070996
关键词
P700; P700 oxidation system; photosynthesis; photosystem I (PSI); plant nutrition; reactive oxygen species (ROS)
资金
- Core Research for Evolutional Science and Technology (CREST) of Japan Science and Technology Agency, Japan [JPMJCR1503]
The study found that deficiencies of different minerals resulted in distinct changes in PSI and PSII parameters in sunflower leaves, such as an increase or decrease in oxidized P700. Specific responses of parameters to each mineral deficiency allowed for diagnosis of the deficiency and identification of which mineral affected photosynthesis.
In response to decreases in the assimilation efficiency of CO2, plants oxidize the reaction center chlorophyll (P700) of photosystem I (PSI) to suppress reactive oxygen species (ROS) production. In hydro-cultured sunflower leaves experiencing essential mineral deficiencies, we analyzed the following parameters that characterize PSI and PSII: (1) the reduction-oxidation states of P700 [Y(I), Y(NA), and Y(ND)]; (2) the relative electron flux in PSII [Y(II)]; (3) the reduction state of the primary electron acceptor in PSII, Q(A) (1 - qL); and (4) the non-photochemical quenching of chlorophyll fluorescence (NPQ). Deficiency treatments for the minerals N, P, Mn, Mg, S, and Zn decreased Y(II) with an increase in the oxidized P700 [Y(ND)], while deficiencies for the minerals K, Fe, Ca, B, and Mo decreased Y(II) without an increase in Y(ND). During the induction of photosynthesis, the above parameters showed specific responses to each mineral. That is, we could diagnose the mineral deficiency and identify which mineral affected the photosynthesis parameters.
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