期刊
AGRONOMY JOURNAL
卷 102, 期 2, 页码 395-402出版社
AMER SOC AGRONOMY
DOI: 10.2134/agronj2009.0274
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类别
资金
- National Science and Technology Support Program [2006BAD09A08-03]
- Yangzhou University [200675]
Emergence and early seedling growth are critical for establishing reasonable plant population densities under saline stress conditions. An experiment with seashore mallow (Kosteletzkya virginica L.) seedling culture in plastic nutrient-rich matrices and transplanted into pots filled with soil from a local farm field was conducted under five salinity levels (0, 0.3, 0.6, 0.9, and 1.2%). Emergence, survival, growth, and physiological characteristics were monitored for 45 d after seeding. Increasing salinity levels from 0.3 to 1.2% inhibited seedling growth through the reduction in leaf size, leaf number, and physiological traits. At 45 d after seeding, there was a reduction of 13 to 47% in photosynthesis, 18 to 62% in soluble protein, 6 to 84% in superoxide dismutase activity, and 20 to 81% in root activities, whereas free amino acids increased by 34 to 104%, proline by 18 to 167%, and malondialdehyde by 20 to 220%. The reduction in photosynthesis was mainly associated with the reduction in stomatal conductance. Emergence and survival rates could be maintained at >= 60% at salinity levels <= 0.9%. Our results indicate that seashore mallow could grow in saline soils with seedling culture in nutrient-rich plastic matrices and transplanted into conventional soils provided that the salinity levels in nutrient-rich medium and conventional soils are <= 0.9%.
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