Role of abscisic acid (ABA)and Arabidopsis thaliana ABA-insensitive loci in low water potential-induced ABA and proline accumulation (Record no. 41957)

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control field 20250625124704.0
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Transcribing agency CICY
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Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) B-7633
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245 10 - TITLE STATEMENT
Title Role of abscisic acid (ABA)and Arabidopsis thaliana ABA-insensitive loci in low water potential-induced ABA and proline accumulation
490 0# - SERIES STATEMENT
Volume/sequential designation Journal of Experimental Botany, 57, p.201-212, 2006
520 3# - SUMMARY, ETC.
Summary, etc. The mechanisms by which plants respond to reduced water availability (low water potential)include both ABA-dependent and ABA-independent processes. Pro accumulation and osmotic adjustment are two important traits for which the mechanisms of regulation by low water potential, and the involvement of ABA, is not well understood. The ABA-deficient mutant, aba2-1, was used to investigate the regulatory role of ABA in low water potential-induced Pro accumulation and osmotic adjustment in seedlings of Arabidopsis thaliana. Low water potential-induced Pro accumulation required wild-type levels of ABA, as well as a change in ABA sensitivity or ABA-independent events. Osmotic adjustment, in contrast, occurred independently of ABA accumulation in aba2-1. Quantification of low water potential-induced ABA and Pro accumulation in five ABA-insensitive mutants, abi1-1, abi2-1, abi3, abi4, and abi5, revealed that abi4 had increased Pro accumulation at low water potential, but a reduced response to exogenous ABA. Both of these responses were modified by sucrose treatment, indicating that ABI4 has a role in connecting ABA and sugar in regulating Pro accumulation. Of the other abi mutants, only abi1 had reduced Pro accumulation in response to low water potential and ABA application. It was also observed that abi1-1 and abi2-1hadincreasedABAaccumulation.Theinvolvement of these loci in feedback regulation of ABA accumulation may occur through an effect on ABA catabolism or conjugation. These data provide new information on the function of ABA in seedlings exposed to low water potential and define newroles for three of thewell-studied abi loci.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Verslues, P.E.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Bray, E.A.
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  Clasificación local     Ref1 CICY CICY Documento préstamo interbibliotecario 25.06.2025   B-7633 25.06.2025 25.06.2025 Documentos solicitados