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cje ›› 2011, Vol. 30 ›› Issue (04): 682-688.

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Regulation effects of bioorganic fertilizer on sunflower seedlings growth and leaf physiological indices under salt-alkali stress.

WANG Shan-xian1,2, LIU Wan1, LI Pei-jun1, ZHAN Zhen-nan1,2, LI Xiao-jun1, JIA Chun-yun1, SONG Li-chao3   

  1. 1Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China|2Graduate University of Chinese Academy of Sciences, Beijing 100049|3Shenyang Agricultural University, Shenyang 110161, China
  • Online:2011-04-08 Published:2011-04-08

Abstract: A pot experiment was conducted to study the effects of different dosages (0%, 2%, 4%, and 8%) bioorganic fertilizer on the seed germination, emergence rate, seedling growth, and leaf physiological indices of sunflower under salt-alkali stress. As compared with the control, after 7-28 days under salt-alkali stress (T0), the seed germination rate and emergence rate decreased markedly, seed emergence delayed for 3 days, seedlings shoot- and root length, shoot- and root fresh weight, and leaf chlorophyll and soluble protein contents decreased significantly (P<0.05), and the roots were much more sensitive than the shoots. As compared with T0, after the application of 2% (T1), 4% (T2), and 8% (T3) bioorganic fertilizer, the seed emergence rate increased by 564% (P<0.05), 643% (P<0.05), and 857% (P<0.05), respectively, and the seed emergence advanced by 2-3 days. After 7 days under salt-alkali stress, the seedling growth in treatments T1, T2, and T3 had an obvious increase, leaf chlorophyll content increased by 24.4% (P<0.05), 27.2% (P<0.05), and 33.2% (P<0.05), and leaf soluble protein content increased by 34.4% (P<0.05), 43.6% (P<0.05) and 48.8% (P<0.05), respectively. When the treated duration prolonged from 7 to 28 days, the inhibitory effects of salt-alkali stress on the seedling growth and the leaf chlorophyll and soluble protein contents in treatments T1, T2, and T3 decreased to some extent. These results indicated that applying 2%-8% bioorganic fertilizer could obviously alleviate the inhibitory effects of salt-alkali stress on the seed emergence, seedling growth, and leaf physiological indices of sunflower.

Key words: 16S rRNA, Oligonucleotide probes, Quantitative hybridization, Microbial ecology