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The Effects of NaCl Stress on Seed Germination and Physiological Indexes of Seedlings of Two Species of Halophytes

Author: GuXiaoZuo
Tutor: DingYanFen
School: Nanjing Forestry University
Course: Ornamental Plants and Horticulture
Keywords: Atriplex in Central Asia Suaeda salsa NaCl stress Seed germination Seedling Physiological indicators
CLC: Q945.78
Type: Master's thesis
Year: 2011
Downloads: 128
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Abstract

Test by different concentration of NaCl stress, the two kinds of halophytes in Central Asia saltbush (Atriplex centralasiatica) the Suaeda salsa (Suaeda salsa) seed germination and seedling physiological indices change research and analysis, to explore the two kinds of plants to salt stress response and salt tolerance mechanism of salt tolerance of difference, and concluded as follows: (1) germination test results show that: As the NaCl concentration increased, the the species germination rate, germination potential, germination index and vigor index showed a different minimize. High concentrations of NaCl stress on seed germination osmotic effect, inhibition of seed germination. NaCl stress, the germination process is delayed. Stress was relieved, the seed still has the a higher germination force and vitality. Central Asia saltbush seed germination salt tolerance of NaCl single salt suitable value 59.39mmol / L critical value 173.7mmol / L, and limits 288.01mmol / L; the Suaeda salsa seed germination salt tolerance of NaCl single salt suitable value 83.67mmol / L, the critical value 193.8mmol / L limit is 303.93mmol / L. Root length inhibition index bud inhibition index increased with NaCl concentration increasing. The radicle of NaCl stress sensitivity is greater than the germ. Low concentrations of NaCl stress on seed germination and radicle growth of the germ has some synergistic effect. (2) Analysis of Physiological indicators: growth and concentration increased with the NaCl stress was a rising trend, the relative conductivity of the two kinds of plants and species relative conductivity and stress time, stress concentration are positive. correlation. NaCl stress, the chlorophyll content varied with NaCl stress increased concentration, Central Asia saltbush is first and then decreased, Suaeda salsa is an upward trend. Chlorophyll content and stress concentration in Central Asia saltbush negative correlation between Suaeda salsa showed a positive correlation. Promote a short period of time, low concentrations of NaCl Stress on Central Asia Atriplex and Suaeda salsa SOD activity in varying degrees, to reduce the stress intensity SOD activity. Species SOD activity was negatively correlated with stress time. NaCl stress intensity increases the Atriplex centralasiatica slightly soluble protein content increased gradually reduced, soluble protein content was positively correlated with stress time, stress concentration was negatively correlated. Suaeda salsa soluble protein content and stress concentration is a positive correlation between the high concentration stress the early soluble protein decreased, then gradually increased. Pro content of the two kinds of plants are rising, as the stress concentration increases with stress prolonging elevated decline. The salt stress process, Pro Suaeda salsa osmoregulation dominant.

The Effects of NaCl Stress on Seed Germination and Physiological Indexes of Seedlings of Two Species of Halophytes

Abstract

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