Articles
EFFECTS OF MAGNESIUM DEFICIENCY ON GROWTH AND PHOTOSYNTHESIS OF FLOWERING CHINESE CABBAGE
Article number
767_16
Pages
169 – 176
Language
English
Abstract
The effects of different Mg concentrations on growth, leaf pigment concentrations and photosynthetic activity were studied in flowering Chinese cabbage (Brassica campestris L. ssp. chinensis var. utilis Tsen et Lee, ‘Youqing 70’) grown in a hydroponic system.
Plants were grown in a solution with sufficient Mg supply for 3 weeks, then transferred to solutions with sufficient (2 mmol·L-1; S[Mg]), moderate (1 mmol·L-1; M[Mg]) or deficient (0 mmol·L-1; D[Mg]) Mg supply.
After 4 weeks, plants grown at D[Mg] displayed severe Mg deficiency symptoms and had significantly less biomass than those at M[Mg] and S[Mg]. There were significant differences in leaf area between the 3 treatments and in plant height between D[Mg] and M[Mg] and between D[Mg] and S[Mg], but no significant differences in leaf number between the 3 treatments.
The yield and vitamin C content of the flower stalk were significantly affected by Mg concentration, but soluble protein content of the flower stalk was not changed by Mg concentration.
Magnesium deficiency reduced the content of chlorophyll and carotenoid in the leaves, especially Chl a and Chl (a+b), but did not alter the ratio of Chl a/b.
Photosynthetic rates, Fm, Fv/Fm and φPSII decreased significantly in the D[Mg] treatment.
Our study indicated that Mg deficiency significantly affected growth and yield of flowering Chinese cabbage by affecting leaf pigment concentrations and photosynthetic activity.
Plants were grown in a solution with sufficient Mg supply for 3 weeks, then transferred to solutions with sufficient (2 mmol·L-1; S[Mg]), moderate (1 mmol·L-1; M[Mg]) or deficient (0 mmol·L-1; D[Mg]) Mg supply.
After 4 weeks, plants grown at D[Mg] displayed severe Mg deficiency symptoms and had significantly less biomass than those at M[Mg] and S[Mg]. There were significant differences in leaf area between the 3 treatments and in plant height between D[Mg] and M[Mg] and between D[Mg] and S[Mg], but no significant differences in leaf number between the 3 treatments.
The yield and vitamin C content of the flower stalk were significantly affected by Mg concentration, but soluble protein content of the flower stalk was not changed by Mg concentration.
Magnesium deficiency reduced the content of chlorophyll and carotenoid in the leaves, especially Chl a and Chl (a+b), but did not alter the ratio of Chl a/b.
Photosynthetic rates, Fm, Fv/Fm and φPSII decreased significantly in the D[Mg] treatment.
Our study indicated that Mg deficiency significantly affected growth and yield of flowering Chinese cabbage by affecting leaf pigment concentrations and photosynthetic activity.
Authors
Houcheng Liu, Ximing Chen, Riyuan Chen, Shiwei Song, Guangwen Sun
Keywords
magnesium deficiency, Brassica campestris L. ssp. chinensis var. utilis, growth, photosynthesis
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