Journal article : China Rice 2017 Vol.23 No.4 pp.26-33 ref.47
Abstract : In order to study the effects of different saline stress on yield and physiological properties of rice at six salinity gradient (0%, 0.07%, 0.14%, 0.21%, 0.28%, 0.35%), a comparative experiment was conducted using Nanjing 9108 and Yongyou 2640 as materials. Key findings of this study were the following: (1) Saline stress affected the growth and development of rice. Plant height, leaf area and dry matter weight were decreased with the increase of salt concentration. The yield of rice decreased with the increase of salt concentration. When the salt concentration was higher than 0.07%, the yields were significantly lower compared with the control. Yields of Nanjing 9108 were respectively dropped by 14.14%, 43.05%, 58.91%, 65.68% and Yongyou 2640 were dropped by 20.25%, 31.97%, 40.41%, 49.82%. (2) With the increase of salt concentration, the activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) of the leaves of two varieties showed a trend of rise first then fall, and the highest value was given at the level of 0.07%. (3) During heading stage, free proline content in leaves increased with the increase of salt concentration. When the salt concentration was higher than 0.14%, the free proline content increased significantly compared with the control. (4) Under saline stress, rice seedling absorbed Na+ from roots and discharged K+. With the increase of salt concentration, the K+ concentration in different organs decreased and the Na+ concentration increased, in addition to the K+ concentration in the leaves. K+/Na+ratio of different parts showed downward trend. SK,Na between stem and leaves increased with the increase of salt concentration. The stem selectively transported K+ and inhibited Na+ into the leaves. SK,N between root and stem decreased with the increase of salt concentration, The stem absorbed Na+ and outputted K+ to the root. Overall, low salt concentration had no significant effect on the yield and physiological characteristics of high yielding rice varieties, once the salt, concentration is higher than 0.07%, the effect was significant.
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