The aberrant cell walls of boron-deficient bean root nodules have no covalently bound hydroxyproline/proline-rich proteins

被引:73
作者
Bonilla, I
Mergold-Villaseñor, C
Campos, ME
Sánchez, N
Pérez, H
López, L
Castrejón, L
Sánchez, F
Cassab, GI
机构
[1] Univ Nacl Autonoma Mexico, Inst Biotechnol, Dept Biol Mol Plantas, Cuernavaca 62271, Morelos, Mexico
[2] Univ Autonoma Madrid, Fac Ciencias, Dept Biol, Madrid 28094, Spain
关键词
D O I
10.1104/pp.115.4.1329
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
B-deficient bean (Phaseolus vulgaris L.) nodules examined by light microscopy showed dramatic anatomical changes, mainly in the parenchyma region. Western analysis of total nodule extracts examined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis showed that one 116-kD polypeptide was recognized by antibodies raised against hydroxyproline-rich glycoproteins (HRGPs) from the soybean (Glycine max) seed coat. A protein with a comparable molecular mass of 116 kD was purified from the cell walls of soybean root nodules. The amino acid composition of this protein is similar to the early nodulin (ENOD2) gene. Immunoprecipitation of the soybean ENOD2 in vitro translation product showed that the soybean seed coat anti-HRGP antibodies recognized this early nodulin. Furthermore, we used these antibodies to localize the ENOD2 homolog in bean nodules. Immunocytochemistry revealed that in B-deficient nodules ENOD2. was absent in the walls of the nodule parenchyma. The absence of ENOD2 in B-deficient nodules was corroborated by performing hydroxyproline assays. Northern analysis showed that ENOD2 mRNA is present in B-deficient nodules; therefore, the accumulation of ENOD2 is not affected by B deficiency, but its assembly into the cell wall is. B-deficient nodules fix much less N-2 than control nodules, probably because the nodule parenchyma is no longer an effective O-2 barrier.
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页码:1329 / 1340
页数:12
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