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Titolo:
Changes in starch content in oat (Avena sativa) shoot pulvini during the gravitropic response
Autore:
Chang, SC; Cho, MH; Kang, BC; Kaufman, PB;
Indirizzi:
Univ Michigan, Dept Biol, Mol Cellular & Dev Biol Grp, Ann Arbor, MI 48109USA Univ Michigan Ann Arbor MI USA 48109 Dev Biol Grp, Ann Arbor, MI 48109USA Yonsei Univ, Dept Biol, Seoul 120749, South Korea Yonsei Univ Seoul South Korea 120749 ept Biol, Seoul 120749, South Korea
Titolo Testata:
JOURNAL OF EXPERIMENTAL BOTANY
fascicolo: 358, volume: 52, anno: 2001,
pagine: 1029 - 1040
SICI:
0022-0957(200105)52:358<1029:CISCIO>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
INDUCED NEURITE OUTGROWTH; PROTEIN-KINASE-C; ARABIDOPSIS-THALIANA; OKADAIC ACID; CALCIUM; PHOSPHORYLATION; INHIBITION; CELLS; CA2+; ROOTS;
Keywords:
calcium; gravitropism; protein dephosphorylation; oat; pulvini; starch metabolism;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Kaufman, PB Univ Michigan, Dept Biol, Mol Cellular & Dev Biol Grp, Ann Arbor, MI 48109USA Univ Michigan Ann Arbor MI USA 48109 , Ann Arbor, MI 48109USA
Citazione:
S.C. Chang et al., "Changes in starch content in oat (Avena sativa) shoot pulvini during the gravitropic response", J EXP BOT, 52(358), 2001, pp. 1029-1040

Abstract

In order to determine if components of the signal transduction pathway areinvolved in starch metabolism during the gravitropic response, the effectsof inhibitors of phosphoprotein phosphatases and protein kinases (OA), andcalcium channel blockers (LaCl3), on gravitropic bending and starch levelsin gravisensitive node/pulvini of oat shoots were examined. Among the compounds tested, okadaic acid (OA) and lanthanum chloride (LaCl3) showed the strongest inhibitory effects on the negative gravitropic curvature response in oat shoot node:pulvini. At the same time, they caused a rapid loss of starch in graviresponding pulvini based on a quantitative analysis of starch levels in the bending tissues over 48 h periods. These two compounds act initially to block the net increase in starch content that occurs during the early stages (0-9 h) in graviresponding oat shoot pulvini. As a result, starch levels drop precipitously in shoots treated with OA and LaCl3, startingat time zero of gravistimulation by reorientation. These findings suggest that protein dephosphorylation and calcium play a role in starch metabolismin oat shoot pulvini in response to a gravistimulation signal. They also indicate that the amount of starch present in the chloroplast gravisensors in oat shoot pulvini may determine the rate of upward bending in graviresponding pulvini.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 31/03/20 alle ore 05:10:55