Pedosphere 19(1): 86--95, 2009
ISSN 1002-0160/CN 32-1315/P
©2009 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effect of N fertilizers on root growth and endogenous hormones in strawberry |
WANG Bo1,2 , LAI Tao1, HUANG Qi-Wei1, YANG Xing-Ming1 and SHEN Qi-Rong1,2 |
1 College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095 (China). E-mail: wangb@suda.edu.cn
2 Faculty of Horticulture, Soochow University, Suzhou 215006 (China) |
| ABSTRACT |
| Endogenous hormones play an important role in the growth and development of roots. The objective of this research was to study the effect of four types of N fertilizers on the root growth of strawberry (Fragaria ananassa Duchesne) and the endogenous enzymes of indole-3-acetic acid (IAA), abscisic acid (ABA), and isopentenyl adenosine (iPA) in its roots and leaves using enzyme-linked immunosorbent assay. Application of all types of N fertilizers significantly depressed (P ≤ 0.05) root growth at 20 d after transplanting. Application of organic-inorganic fertilizer (OIF) as basal fertilizer had a significant negative effect (P ≤ 0.05) on root growth. The application of OIF and urea lowered the lateral root frequency in strawberry plants at 60 d (P ≤ 0.05) compared with the application of two organic fertilizers (OFA and OFB) and the control (CK). With the fertilizer treatments, there were the same concentrations of IAA and ABA in both roots and leaves at the initial growth stage (20 d), lower levels of IAA and ABA at the later stage (60 d), and higher iPA levels at all seedling stages as compared to those of CK. Thus, changes in the concentrations of endogenous phytohormones in strawberry plants could be responsible for the morphological changes of roots due to fertilization. |
| Key Words: endogenous hormone, organic and inorganic N fertilizers, root growth, strawberry |
| Citation: Wang, B., Lai, T., Huang, Q. W., Yang, X. M. and Shen, Q. R. 2009. Effect of N fertilizers on root growth and endogenous hormones in strawberry. Pedosphere. 19(1): 86-95. |
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