The expression of floral organ identity genes in contrasting water lily cultivars |
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Authors: | Huolin Luo Sumei Chen Jiafu Jiang Yu Chen Fadi Chen Nianjun Teng Dongmei Yin Changbing Huang |
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Institution: | (1) College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People’s Republic of China;(2) Present address: Suzhou Polytechnic Institute of Agriculture, Suzhou, 215008, Jiangsu, People’s Republic of China; |
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Abstract: | The floral organs of typical eudicots such as Arabidopsis thaliana are arranged in four characteristic whorls, namely the sepal, petal, stamen and carpel, and the “ABC” floral organ identity
model has been based on this arrangement. However, the floral organs in most basal angiosperms are spirally arranged with
a gradual transition from the inside to outside, and an alternative model referred to as “fading borders” was developed to
take account of this. The flower morphology of the water lily was tested against the “fading borders” model by determining
the expression profile of the six primary floral organ identity genes AP2, AGL6, AP3, PI, AG and SEP1 in two cultivars showing contrasting floral morphology. In addition, to get accurate floatation of the genes expression level
from outer to inner, we divided the floral organs into eight whorls according to morphological features. All these genes were
expressed throughout all whorls of the flower, but their expression level changed gradually from the outside of the flower
to its inside. This pattern was consistent with the “fading borders” model. |
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