Crops ›› 2020, Vol. 36 ›› Issue (1): 98-102.doi: 10.16035/j.issn.1001-7283.2020.01.016

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Effects of Alkali Stress on Chlorophyll and the Contents of Proline and Soluble Sugar in Rice

Zhao Haixin   

  1. Rice Research Institute, Heilongjiang Academy of Agricultural Sciences, Jiamusi 154026, Heilongjiang, China
  • Received:2019-06-12 Revised:2019-11-26 Online:2020-02-15 Published:2020-02-23

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Abstract:

In this study, the relative water content, chlorophyll, proline and soluble sugar contents of top leaves were quantified after 20 days of Na2CO3+NaHCO3 alkali stress in 4.5 leaf age rice seedlings treated with 5 concentrations. The results showed that the relative water content of the leaves first increased and then decreased after the treatment concentration increases. The content and ratio of chlorophyll a and b were significant linear with decreasing trend. Proline content and soluble sugar content decreased first and then rose. After alkali stress, chlorophyll a is more destructive and chlorophyll b is relatively stable. The water content and proline content of the top leaves were regulated by the soluble sugar content in rice to improve its resistance and maintain the activity of the newborn leaves.

Key words: Rice, Alkali stress, Chlorophyll, Proline, Soluble sugar, Inverse resistance

Fig.1

Changes of relative water content of top leaves under different alkali treatments"

Fig.2

The effects of alkali concentration on the contents of chlorophyll a and chlorophyll b"

Fig.3

The effects of alkali concentration on chlorophyll a/b"

Fig.4

Changes of proline content in leaves of different varieties under different alkali treatments"

Fig.5

Changes of proline content of different varieties under different alkali treatments "**" indicates extremely significant correlation (P<0.01), the same below"

Fig.6

Effects of alkali concentration on soluble sugar content of rice varieties"

Fig.7

Changes of soluble sugar content in rice leaves treated with alkali concentration treatment"

Fig.8

Correlation anaylsis of soluble sugar and proline content under alkali concentration treatments "*" indicates significant correlation (P<0.05)"

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