Comparative analysis of endogenous hormones in maize seeds with different dormancy characteristics

doi:10.11686/cyxb2015136

Abstract

Abstract: A study has been undertaken to clarify maize seed dormancy mechanisms. Four endogenous hormones-zeatin (ZT), gibberellins (GA₃), indole acetic acid (IAA) and abscisic acid (ABA) in 7 maize inbred lines with diverse dormancy characteristics were measured and analysed by HPLC. We analysed the effect of the four endogenous hormones on seed dormancy, including their interaction. Results indicated that ZT content was negatively correlated with seed dormancy, with an antagonism to germination inhibitors. GA₃ is necessary for germination and can help break dormancy. IAA has no correlation with seed dormancy. ABA promoted dormancy and inhibited germination, with an antagonism to GA₃. Furthermore, seed dormancy was closely related to the proportion of the four hormones. Maize inbred lines with strong dormancy had the following traits: low content of ZT and GA₃, high content of ABA, low values of ZT/ABA and GA₃/ABA, and balanced hormone content.

WU Yuan-Qi, LENG Yi-Feng, XIA Chao, ZHOU Shu-Feng, LAN Hai. Comparative analysis of endogenous hormones in maize seeds with different dormancy characteristics[J]. Acta Prataculturae Sinica, 2015, 24(12): 213-219.

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