棉 花 学 报    Cotton Science   2010，22（3）：248-253

Response of Plant Height to the Exogenous Hormones of Dwarf Cotton ( Gossypium hirsutum L.) Lu-ai No.1
LIU Ai-yu¹, CHEN Jin-xiang^1*, LI Rui-lian¹, YI Jiu-hong^1，2, FENG Zheng-rui¹
(1.Agronomy college, Hunan Agricultural University, Changsha 410128, China；2.Crop research institute, Hunan Agricuture Scientific Academy, Changsha 410128, China)

Abstract: The study was undertaken to assess the sensitivity of plant height of Dwarf cotton ( Gossypium hirsutum L.) Lu-ai No.1 to ectohormone through spraying different concentrations of hormones at the budding stage and flower-boll stage. The results showed that: Lu-ai No.1 was more sensitive to the exogenous hormones than the CK, various concentrations of GA₃ can promote plant height of Lu-ai No.1 significantly, especially under 100 mg·L^-1 and 150 mg·L^-1 concentration, the promoting rate of 100.70% and 59.15% for Lu-ai No.1, while 27.51% and 27.88% for TM-1( CK), respectively. ABA significantly inhibited the plant height of Lu-ai No.1, the higher concentration, the stronger inhibition, the promotion rate was -31.03% under 40 mg·L^-1. Lower concentration (20 mg·L^-1) of the IAA treatment can significantly promote the plant height of dwarf Lu-ai No.1 and reverse under higher concentrations; higher concentration of KT treatment significantly inhibited the plant height of Lu-ai No.1, but lower concentrations indistinctively promoted. Mixed spraying with four kinds of hormones showed up antagonistic effect on promoting plant height of Lu-ai No.1, with much lower promoting rate than that of GA3 treatment alone.
Key words: Upland cotton ( Gossypium hirsutum L.); Lu-ai No.1; plant height; ectohormones;
sensibility            [Full Text, 298KB]