Articles

Effect of Coronatine on Internode Elongation and Yield Characters of Maize

  • WEI Xiaoyi;ZHANG Mingcai;LI Zhaohu;DUAN Liusheng
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  • Engineering Research Center of Plant Growth Regulator, Ministry of Education; College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China

Received date: 2011-03-15

  Revised date: 2011-06-24

  Online published: 2011-07-18

Abstract

Maize hybrid Zhengdan 958 was tested, with the treatment of 0.001, 0.01, 0.1 and 1μmol/L coronatine (COR), and with water as control (CK). Agronomic traits, physiological indexes and yield characters were measured to study the effect of coronatine on internode elongations in maize. The results show that with the increase of the concentration of coronatine, the plant height, the ear height and the internode length are decreased. The plant height, the ear height and the internode length of the 2nd to 8th internodes with the treatment of 0.01, 0.1 and 1μmol/L COR are smaller than those of CK, and the differences are in a significant or highly significant level. With the increase of the concentration of coronatine, the activities of indole acetic acid oxidase (IAAO), phenylalanine ammonia lyase (PAL) and peroxidase (POD) of the elongated internodes are significantly increased. Except for the 0.001μmol/L COR treatment, the enzymatic activities of IAAO, PAL and POD with the treatment of 0.01, 0.1 and 1μmol/L COR are higher than those of CK, and the differences are in a highly significant level. Compared with those of CK, the ear length, the kernels per row, the ear weight, the grain weight per ear and the yield with the treatment of 0.001 and 0.01μmol/L COR are significantly or highly significantly increased. With the increase of concentrations of coronatine, these traits see decreasing trends, which shows that low concentrations of coronatine would increase the maize production. On the whole, the optimal concentration of coronatine should be 0.01μmol/L, which could suppress the internode elongation and increase the production. Therefore, the coronatine has a good prospect to serve as a retardant in maize.

Cite this article

WEI Xiaoyi;ZHANG Mingcai;LI Zhaohu;DUAN Liusheng . Effect of Coronatine on Internode Elongation and Yield Characters of Maize[J]. Science & Technology Review, 2011 , 29(20) : 63 -67 . DOI: 10.3981/j.issn.1000-7857.2011.20.011

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