REPRESSION OF THE PEA LIPOXYGENASE GENE LOXG IS ASSOCIATED WITH CARPEL DEVELOPMENT

被引:29
作者
RODRIGUEZCONCEPCION, M [1 ]
BELTRAN, JP [1 ]
机构
[1] UNIV POLITECN VALENCIA,CSIC,INST BIOL MOLEC & CELULAR PLANTAS,E-46022 VALENCIA,SPAIN
关键词
CARPEL DEVELOPMENT; FRUIT-SET; GIBBERELLINS; LIPOXYGENASE; PEA;
D O I
10.1007/BF00037017
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
A cDNA clone (loxg) corresponding to a gene repressed during carpel development has been isolated from a cDNA library of unpollinated carpels induced to grow by treatment with gibberellic acid (GA,). The sequences of loxg cDNA and the deduced polypeptide have a high similarity with legume type 2 lipoxygenases, especially with Phaseolus lox1 (78.5% similarity at the protein level) and pea and soybean lox3 (83.6% and 85.4%, respectively). loxg expression is constant in unstimulated carpels but it decreases in carpels induced to keep growing by fertilization or hormone treatment. A similar pattern of repression was observed in lipoxygenase activity of pea and tomato carpels. In situ hybridization studies showed that loxg mRNAs are present in the endocarp and the mesocarp of pea pods; no loxg expression was detectable either in the pod exocarp or in the ovules. Loxg is also expressed in other young growing tissues, especially in flower organs. Nevertheless, the natural pattern of flower and fruit development is associated with loxg repression.
引用
收藏
页码:887 / 899
页数:13
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