一个黄麻矮秆种质株高性状对外源激素的敏感性

doi:10.3864/j.issn.0578-1752.2015.10.003

Abstract

Abstract: 【Objective】The aim of this study was to illuminate the sensibility of the exogenous hormones to plant height of a dwarf germplasm Aidianyehuangma so as to determine which kind of hormone sensitivity this germplasm belongs to, which will facilitate dissecting the relationship between the genetic basis of plant height and hormonal regulation in jute. 【Method】 Firstly, the performance of important agricultural traits, e.g. plant height, were compared between Aidianyehuangma and the variety Huangma 179 with normal plant height. Secondly, the dwarf germplasm of Aidianyehuangma was treated with different concentrations of exogenous GA₃, IAA and BR. And the hypocotyl length in the Ms culture media and plant height variation in the field were investigated. Meanwhile, the hypocotyl length of Huangma 179 and Aidianyehuangma on the GA₃ culture media was evaluated. Thirdly, the effects of continuous spraying of 100 mg·L^-1GA₃ every 3 days on plant height of Aidianyehuangma were analyzed. Furthermore, the activities of α - amylase of Aidianyehuangma were analyzed after it was once treated with GA₃. 【Result】 The comparison analysis of important agricultural traits showed that the plant height of Aidianyehuangma (1.89 m) was significantly lower than that of Huangma 179 (4.28 m) without exogenous hormone treatment, indicating that Aidianyehuangma is a typical dwarf germplasm in jute. After being treated with MS culture media of 0.1 mg^.L^-1 exogenous IAA and BR, the hypocotyl length of Aidianyehuangma did not show a significant difference with that of the control. However, after being treated with MS culture media of 0.1 mg·L^-1 exogenous GA₃, the hypocotyl length of Aidianyehuangma showed a significant difference compared with Aidianyehuangma without being treated with GA₃, and the hypocotyl length of Aidianyehuangma and Huangma 179 was similar to that of Huangma 179 without being treated with GA₃. It suggested that the plant height of Aidianyehuangma is sensitive to exogenous GA₃ while that of Huangma 179 is not sensitive to the exogenous GA₃. After being treated with different concentrations of exogenous hormone in the field, plant height of Aidianyehuangma with high concentration (100 mg·L^-1) of GA₃ was significantly higher than that with the other two lower concentrations of GA₃. By contrast, plant height of Aidianyehuangma treated with different concentrations of exogenous IAA and BR did not show a significant difference with that of the control. It further suggested that Aidianyehuangma is a GA₃ sensitive dwarf germplasm. After being treated with 100 mg·L^-1 exogenous GA₃ continuously in the field, the plant height of Aidianyehuangma showed a significant difference in comparison of Aidianyehuangma without being treated with GA₃, reaching a significant level, and appoached that of Huangma 179. It showed that plant height of Aidianyehuangma could be resumed using exogenousGA₃. After Aidianyehuangma was once treated with GA₃, α- amylase activity of Aidianyehuangma in the first 3 days began to increase in comparison with that before treatment, and enhanced significantly in the first 6 days, which indicated that the exogenous GA₃ could increase the α- amylase activity of Aidianyehuangma. 【Conclusion】Aidianyehuangma is a typical dwarf germplasm in jute. The plant height of Aidianyehuangma is not sensitive to exogenous IAA and BR, but sensitive to the exogenous GA₃, and can be resumed to normal plant height with continuous exogenous GA₃ treatment. The exogenous GA₃ could increase the α- amylase activity of Aidianyehuangma. Aidianyehuangma is a GA₃ sensitive dwarf germplasm.

Key words: jute, dwarf, plant height, hormones, GA₃sensitivity

ZHANG Li-wu, HUANG Wen-xuan, TAO Ai-fen, LIN Li-hui, XU Jian-tang, FANG Ping-ping, QI Jian-min. Research of Exogenous Hormone Sensitivity on Plant Height of a Dwarf Germplasm in Jute (Corchorus capsularis L.)[J].Scientia Agricultura Sinica, 2015, 48(10): 1892-1899.

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