J Integr Plant Biol. ›› 1964, Vol. 12 ›› Issue (1): -.

• Research Articles •    

A Preliminary Study of Increasing the Salt Tolerance of Soybean and Italian Millet (Setaria italica)

Pang Shih Chuan, Chang Sian Tze and Wu Ching Fung   

Abstract: The effects of seed treatment of soybean and millet with different available mineral solutions were studied. The aim of this study is to investigate the mechanism of increasing the salt tolerance and raising the seed yield of soybean and millet. The main results and conclusions are summarized as follows: 1. Seeds were treated with various concentrations of CaC12, NaC1, NaHCO3, Na2SO4, and saline soil from Chao-Tung, AN-Ta districts. Based on our experimental results the degree of tolerance of each variety varied both with different salts and with various concentrations of the same salt. It was shown that each variety had its own limited adaptability to salt hardiness. 2. Early workers, discussed the salt tolerances of trees, shrubs, or crops, claiming that the tolerant degree of plants was directly correlated with the concentrations of salt content. Results of our experiment indicated that the salt tolerance of each variety might be increased only when seeds were treated with a definite available concentration of a suitable solute. 3. Under the treatment of different mineral solute, soybean and millet showed radical changes in germination rate, germination percentage, seedling survival and growth. Based on our results soybean showed relatively higher germination percentage and growth of seedlings; under the treatment of 0.3%, 0.5%, CaC12; 1% NaCl; 0.5% Na2SO4; 1% NaHCO3 and light saline soil from Chaotung; while with Italian millet similar effects were obtained with the treatment of 0.5%, 1% CaCl2; 1%, 3% NaCl; 2% NaHCO3; 1% Na2SO4 and light saline soil. 4. In soybean, the treatment of 1% CaC12; 3% NaCl; 1% NaHCO3; and light saline soil increased photosynthetic rate, and decreased respiratory intensity. In millet, similar effects were obtained with 1.5% CaC12; 7% NaCl; 4% NaHCO3. In regard to the chlorophyll content, 1% CaC12; 1%, 3% NaC1; 1%, 4% NaHCO3 treatments, resulted in a somewhat slight increase in quantity. The activity of catalase was more or less irregular. The oil content of soybean seed showed an increase of over 2%, with 1 % CaC12;1% NaHCO3; and heavy saline soil treatment. 5, Salt treatments exert a significant influence on seed yield, both in soybean and millet. According to our experimental results, it has been shown that the treatment with 1% CaCl2; 3% NaCl; and light saline soil to soybean raised the yield more than 10%; while to millet, the solution of 1%, 1.5%, 2% CaC12; 7% NaC1; 4% NaHCO3 increased the yield over 10% too.

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