Chemical regulation of vegetative growth∗

Davis, Tim D.; Curry, Eric A.; Steffens, G. L.

doi:10.1080/07352689109382310

Cited by 147 publications

(99 citation statements)

References 201 publications

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“…The Arabidopsis spy mutations confer resistance to the plant-growth and GA-biosynthesis inhibitor PAC (Hedden and Graebe, 1985;Davis and Curry, 1991) and suppress the effects of GA deficiency (Jacobsen and Olszewski, 1993;Jacobsen et al, 1996). Thus, although the GA-deficient ga1-2 mutant requires exogenous GA for germination (Koornneef and van der Veen, 1980;Sun et al, 1992), spy-1 ga1-2 double-mutant seeds germinate in the absence of exogenous GA (Jacobsen and Olszewski, 1993).…”

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confidence: 99%

Extragenic Suppressors of the Arabidopsis gaiMutation Alter the Dose-Response Relationship of Diverse Gibberellin Responses1

et al. 1999

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Active gibberellins (GAs) are endogenous factors that regulate plant growth and development in a dose-dependent fashion. Mutant plants that are GA deficient, or exhibit reduced GA responses, display a characteristic dwarf phenotype. Extragenic suppressor analysis has resulted in the isolation of Arabidopsis mutations, which partially suppress the dwarf phenotype conferred by GA deficiency and reduced GA-response mutations. Here we describe detailed studies of the effects of two of these suppressors, spy-7 and gar2-1, on several different GA-responsive growth processes (seed germination, vegetative growth, stem elongation, chlorophyll accumulation, and flowering) and on the in planta amounts of active and inactive GA species. The results of these experiments show that spy-7 and gar2-1 affect the GA dose-response relationship for a wide range of GA responses and suggest that all GA-regulated processes are controlled through a negatively acting GA-signaling pathway.

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Extragenic Suppressors of the Arabidopsis gaiMutation Alter the Dose-Response Relationship of Diverse Gibberellin Responses1

et al. 1999

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“…There are few studies on the potential of growth regulators in mitigating the harmful effects of abiotic stress in plants (Davies and Cury 1991). Brassinosteroids (BRs) are steroidal sixth group of phytohormones with significant growth promoting effects and are essential for many processes in plant growth and development (Rao et al 2002, Sasse 2003.…”

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confidence: 99%

The effect of brassinosteroids on radish (Raphanus sativus L.) seedlings growing under cadmium stress

Anuradha¹,

Rao²

2007

Plant Soil Environ.

103

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The effect of 24-epibrassinolide and 28-homobrassinolide on seed germination and seedling growth of radish (Raphanus sativus L.) was studied under cadmium toxicity. The impact of brassinosteroids (BRs) on free proline levels and the activity of antioxidant enzymes catalase (CAT; EC 1.11.1.6), peroxidase (POD; EC 1.11.1.7), superoxide dismutase (SOD; EC 1.15.1.1), ascorbic peroxidase (APOX; EC 1.11.1.11) and guaiacol peroxidase (GPX; EC 1.11.1.7) in radish seedlings under Cd toxicity was evaluated. The effect of BRs on the activity of ascorbic acid oxidase (AAO; EC 1.10.3.3) and lipid peroxidation in radish seedlings challenged with Cd stress was also investigated. BRs supplementation alleviated the toxic effect of the heavy metal and increased the percentage of seed germination and seedling growth. Out of the two substances, HBL was found to be more effective than EBL in stress alleviation. HBL (3µM) alleviated the toxic effect of the heavy metal and increased the percentage of seed germination by 57% over Cd and 20% over unstressed control. Similarly supplementation of HBL (3µM) caused an increase of 156%, 78% and 91% in length, fresh weight and dry weight of seedling, respectively, over Cd treatment alone. The amelioration of seedling growth by BRs under metal toxicity was associated with enhanced levels of free proline. The activities of antioxidant enzymes CAT, SOD, APOX and GPX were increased in the seedlings from treatments with Cd along with BRs. Brassinosteroid treatment reduced the activity of POD and AAO in heavy metal stressed seedlings. Lipid peroxidation induced by Cd was found reduced with the supplementation of BRs. The results obtained in the study clearly indicated the ameliorative influence of brassinosteroids on the inhibitory effect of Cd toxicity.

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“…CCC is a favorable choice for general application since it is easily broken down in the environment [12]. Chlormequate chloride disrupts gibberellin biosynthesis prior to the steps at which PBZ acts, inhibiting cyclization of geranylgeranyl diphosphate to copalyl diphosphate [4]. Aphalo et al [13] found that application of CCC to containerized silver birch seedlings partially inhibited their height, growth and dry mass accumulation without negative effects on root growth in the following spring.…”

Section: Introductionmentioning

confidence: 99%

“…Paclobutrazol (PBZ) [(2RS, 3RS)-1-(4-chlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-1-yl) pentan-3-ol], a member of the triazole plant growth inhibitor group, is a broad-spectrum gibberellin biosynthesis inhibitor [4]. The primary action of PBZ is to inhibit ent-kaurene oxidase, which catalyzes the sequential oxidations from ent-kaurene to ent-kaurenoic acid in the early sequence of gibberellin biosynthesis [5], resulting in reduced plant height [6,7], increased chlorophyll content [8], and enhanced carbohydrate accumulation in shoots and roots [9,10].…”

Section: Introductionmentioning

confidence: 99%

Effects of plant growth regulators on growth and carbohydrate accumulation in shoots and roots of two almond rootstock seedlings

Mobli¹,

Baninasab²

2008

Fruits

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Effects of plant growth regulators on growth and carbohydrate accumulation in shoots and roots of two almond rootstock seedlings. Abstract --Introduction. Prunus amygdalus and P. webbii can be used as rootstocks for almond cultivars due to their adaptability to severe environmental conditions. However, the time required for seedlings to reach a suitable size for transplanting may take 1 to 3 years. Our study tested the effects of foliar application of growth regulators on the vegetative growth and carbohydrate accumulation in shoots and roots of these species. Materials and methods. Six-week-old seedlings were treated with gibberellic acid (GA 3 ) (100 mg·L -1 ) alone or with GA 3 followed by ethephon [(100 and 200) mg·L -1 ], or chlormequat chloride (CCC) [(500 and 1000) mg·L -1 ], or paclobutrazol (PBZ) [(500 and 1000) mg·L -1 ]. Results and discussion. Most levels of plant growth regulators significantly enhanced seedling growth. However, GA 3 alone was most effective on stem height, leaf area, and shoot fresh and dry weights of both almond species. The thickest stems of P. amygdalus and P. webbii were obtained from the application of 100 mg GA 3 ·L -1 followed by application of (1000 and 500) mg PBZ·L -1 , respectively. In both species, PBZ significantly increased leaf chlorophyll content compared with the controls as well as with the other treatments. Application of GA 3 alone on P. webbii and of GA 3 followed by 100 mg ethephon·L -1 on P. amygdalus showed the highest root number, and root fresh and dry weights. High levels of soluble sugars and starch in the shoots and roots of both species were observed when GA 3 application was followed by PBZ. Conclusion. These results demonstrated that application of plant growth regulators to the seedlings might be a useful way of enhancing growth of P. amygdalus and P. webbii and reducing the time and cost of seedling production. Iran Islamic Republic / Prunus amygdalus / Prunus webbii / rootstocks / seedlings / growth / plant growth substances / gibberellic acid / ethephon / chlormequat / paclobutrazol Effets des régulateurs de croissance végétaux sur la croissance et l'accumulation d'hydrate de carbone dans les tiges et racines de deux porte-greffes d'amandier.

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Chemical regulation of vegetative growth∗

Cited by 147 publications

References 201 publications

Extragenic Suppressors of the Arabidopsis gaiMutation Alter the Dose-Response Relationship of Diverse Gibberellin Responses1

Extragenic Suppressors of the Arabidopsis gaiMutation Alter the Dose-Response Relationship of Diverse Gibberellin Responses1

The effect of brassinosteroids on radish (Raphanus sativus L.) seedlings growing under cadmium stress

Effects of plant growth regulators on growth and carbohydrate accumulation in shoots and roots of two almond rootstock seedlings

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