棉 花 学 报     Cotton Science     2009，21(3)：248-251

Endogenous Hormone Contents in Apical Buds of Short-stalked Cotton Lu-ai No.1
LIU Ai-yu，CHEN Jin-xiang^*，LI Rui-lian, YI Jiu-hong，FENG Zheng-rui
(College of Agronomy，Hu′nan Agricultural University，Changsha 410128，China)

Abstract：The endogenous hormones contents of a dwarf cotton( Gossypium hirsutum L.) line Lu-ai-1,standard line, TM-1, and their hybrid F₁ at different growth stages were presented in the paper. The result showed that the GA₃ and IAA contents in apical buds of Lu-ai-1 at different growth stages were lower than that of TM-1 and F₁, and the GA₃content in apical buds of Lu-ai 1 at peak squaring stage was only about 28.37% and 31.04% of TM-1 and F₁, and IAA at first flowering stage was 61.20% and 52.76% of TM-1 and F₁, respectively. The maximal Z content in apical buds of Lu-ai-1 and F₁ was reached at the beginning of squaring, and then decreased gradually, which was 15 days earlier than that of TM-1.The ABA content in apical buds of Lu-ai-1 decreased rapidly after peak squaring stage, but still kept the highest level compared with that of TM-1 and F₁, and the ABA content was 26.7%, 32.4%, 132.5% higher than that of TM-1, and 129.1%, 87.5%, 37.4% higher than that of F¹ at peak squaring stage, first flowering stage and peak flowering stage, respectively.
Key words：cotton；short-statured line；apical bud；endogenous hormones    [Full Text, 1822KB]