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Titolo:
Effects of boron starvation on boron compartmentation, and possibly hormone-mediated elongation growth and apical dominance of pea (Pisum sativum) plants
Autore:
Li, CJ; Pfeffer, H; Dannel, F; Romheld, V; Bangerth, F;
Indirizzi:
Univ Hohenheim, Inst Obst Gemuse & Weinbau 370, D-70593 Stuttgart, GermanyUniv Hohenheim Stuttgart Germany D-70593 370, D-70593 Stuttgart, Germany Univ Hohenheim, Inst Pflanzenernahrung 330, D-70593 Stuttgart, Germany Univ Hohenheim Stuttgart Germany D-70593 330, D-70593 Stuttgart, Germany China Agr Univ, Dept Plant Nutr, Beijing 100094, Peoples R China China AgrUniv Beijing Peoples R China 100094 ng 100094, Peoples R China
Titolo Testata:
PHYSIOLOGIA PLANTARUM
fascicolo: 2, volume: 111, anno: 2001,
pagine: 212 - 219
SICI:
0031-9317(200102)111:2<212:EOBSOB>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUNFLOWER HYPOCOTYL SEGMENTS; CYTOKININ CONCENTRATION; STEM ELONGATION; TRANSPORT; AUXIN; DEFICIENCY; ACID; DECAPITATION; SEEDLINGS; LEAVES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Bangerth, F Univ Hohenheim, Inst Obst Gemuse & Weinbau 370, D-70593 Stuttgart, Germany Univ Hohenheim Stuttgart Germany D-70593 Stuttgart, Germany
Citazione:
C.J. Li et al., "Effects of boron starvation on boron compartmentation, and possibly hormone-mediated elongation growth and apical dominance of pea (Pisum sativum) plants", PHYSL PLANT, 111(2), 2001, pp. 212-219

Abstract

Two experiments were carried out to study the effects of boron (B) deficiency on 7-day-old pea plants for 6 or 9 days under controlled growth chamberconditions. Growth and apical dominance (AD) of the plants and their B concentration and compartmentation were followed throughout the starvation period. Additionally, auxin (indoleacetic acid, IAA) concentration in the shoot apex and polar transport from it were measured along with the cytokinin (CK) concentration in the shoot apex and the roots. The results demonstrate that during a 6-day B-deficiency period, B concentration in the water-insoluble residue of the roots was very stable and could not easily be reduced. In contrast, B concentration in the cell sap fraction was very sensitive toexternal B supply. Twelve hours after transferring the plants from B-sufficient to B-deficient solutions, the B concentration in root cell sap declined to half the concentration of the control plants. In addition, B concentration in the new aerial plant parts, which developed after the onset of theB-deficiency treatment, was extremely low. A decline in elongation growth could be observed as soon as about 4 days after the imposition of B deficiency. This preceded the first measurable growth of lateral buds (release from AD). Before the onset of these morphological changes, there was a considerable decline in CK concentration, accompanied by a dramatic decrease in IAA export out of the shoot apex, a decline in IAA concentration in the shootapex and the roots and a reduced capacity for polar IAA-transport. These changes are discussed as possible reasons for the observed reduction in elongation growth and AD. These hormonal changes themselves are possibly the result of the decreased symplasmic B concentration, which in turn may be responsible for the reduced concentration in apical CKs, A sequence of events, which may be causally related, is suggested to explain the effects of B deficiency on the growth and AD of pea plants.

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Documento generato il 25/09/20 alle ore 06:53:55