Brassinolides and IAA induce the transcription of four ?-expansin genes related to development in Cicer arietinum
2004
S?nchez, Ma Angeles | Mateos, Isabel | Labrador, Emilia | Dopico, Berta
Four different cDNAs encoding a-expansins have been identified in Cicer arietinum (Ca-EXPA1, Ca-EXPA2, Ca-EXPA3 and Ca-EXPA4). The shared amino acid sequence similarity among the four a-expansin proteins ranged from 67 to 89%. All of them display common characteristics such as molecular mass (around 24 kDa), amino acid numbers, and also the presence of a signal peptide. The transcription pattern of chickpea a-expansin genes in seedlings and plants suggests a specific role for each of the four a-expansins in different phases of development or in different plant organs. High levels of Ca-EXPA2 transcripts coincide with maximum epicotyl and stem growth, indicating an important involvement of this particular a-expansin in elongating tissues. Ca-EXPA3 would be related to radicle development, while Ca-EXPA4 seems to be involved in pod development.A considerable increase in the level of all Ca-EXPA transcripts accompanied the indole acetic acid (IAA) plus brassinolide (BR)-induced elongation of excised epicotyl segments. This IAA + BR induction was seen even for the chickpea expansin genes whose transcription was not affected by IAA or BR alone.
Mostrar más [+] Menos [-]This work was supported by a grant from the Ministerio de Ciencia y Tecnolog?a, Spain (BOS2002-01900) and the Junta de Castilla y Le?n (SA124/04).
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