Influence of plant growth regulators on some enzymes of nitrogen assimilation in mustard seedlings

Chanda, Sumitra; Sood, Chitra; Reddy, V. S.; Singh, Y. D.

doi:10.1080/01904169809365521

Cited by 10 publications

(10 citation statements)

References 20 publications

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“…Although information on this subject is scant, early studies indicated that the applications of cytokinines, gibberellins, and indolacetic acid boost NR activity in the absence of NO 3 -, whereas the application of Ethephon stimulates NR activity only in the presence of NO 3 -(Hä nisch ten Cate and Bretele, 1982). More recent research, by Chanda et al (1998), confirms the above conclusions, reporting that the effect of the bioregulators giberrellic acid, kinetin, and abscisic acid on nitrogen metabolism is based on the induction of NR activity.…”

Section: Introductionsupporting

confidence: 73%

Nitrogen Metabolism in Pepper Plants Applied with Different Bioregulators

Ruiz

Castilla

Romero

2000

J. Agric. Food Chem.

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Certain bioregulators were studied in relation to nitrogen metabolism of pepper plants (Capsicum annuum L. cv. Lamuyo). Plants were grown under controlled conditions and submitted to regular fertilization with macro- and micronutrients. Treatments were as follows: nontreated control (T0); fosfonutren [essential amino acids and micronutrients (46.9 mg L(-)(1))] (T1); biozyme [GA(3) (32.2 mg L(-)(1)) plus IAA (32.2 mg L(-)(1)) plus zeatin (83.2 mg L(-)(1)) plus chelated micronutrients] (T2); and GA(3) [16 mg L(-)(1)] (T3). The concentrations of NO(3)(-), organic N, amino acids, and proteins, the activities of nitrate reductase (NR) and nitrite reductase (NiR), and finally the foliar dry weight and yield were analyzed. The results indicated that the application of certain bioregulators, such as fosfonutren (T1), which contain amino acids can cause a negative effect on the efficiency and utilization of NO(3)(-), resulting in a drastic loss in growth and yield, even under the control treatment, in which no bioregulator was applied. On the contrary, the application of certain bioregulators based principally on the combination of different hormones, as in the case of biozyme (T2), increased NO(3)(-) assimilation under our experimental conditions, due possibly to a greater availability of these bioregulators in the leaves and increased NR and NiR activities. This appears to explain why the T2 treatment gave the greatest foliar dry weight and fruit yield per plant in the experiment.

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Section: Introductionsupporting

confidence: 73%

Nitrogen Metabolism in Pepper Plants Applied with Different Bioregulators

Ruiz

Castilla

Romero

2000

J. Agric. Food Chem.

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“…This may also be attributed, as for growth characters, to its (GA) roles, on one hand, and compensation of the "hidden hunger" for GA by its pre-sowing seed treatment or foliar application on the other. These results corroborate the various other findings [59] [60] on sunflower and [61] [62] on other plant. The improvement in leaf N, P and K contents at both stages (50 and 70 DAS) resulting from pre-sowing seed treatment with GA particularly at 10 −3 M GA over the control is not far to seek.…”

Section: Soaking Durations (H)supporting

confidence: 83%

Augmentation of Dry Matter Production, Photosynthetic Enzymes, Yield Attributes and Quality Parameters of Sunflower through Seed Priming Effect of Gibberellic Acid—A Multifaceted Hormone

Jafri¹,

Mazid²

2015

OALib

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The aim of this experiment is to search best concentration of GA and appropriate duration (soaking hour) as well as to find out best interaction between best concentration and best soaking duration. Soaking the seeds with 10 −5 M GA for 8 h is best for growth and development of sunflower cv. PAC 3776. Surface sterilized seeds sunflowers (Helianthus annus L.) were soaked in 0, 10 −7 , 10 −5 and 10 −3 M aqueous solution of gibberellic acid (GA) for 4, 8, 12 and 16 h and sown in pots filled with 4 kg homogenous mixture of soil and farmyard manure in the ratio of 4:1. The plants were sampled at 50 and 70 days after sowing (DAS), for analysis of shoot and root dry weight, leaf area index (LAI), carbonic anhydrase activity (CA) and nitrate reductase (NR) activity, nitrogen (N), phosphorus (P) and potassium (K) content at 50 and 70 DAS and seeds per head, seed yield, and harvest index, acid value, iodine value and saponification value at harvest (90 DAS). All parameters were found to be significantly enhanced by the GA seed priming effect, with maximum stimulation being noted following an 8 h soaking treatment with 10 −5 M GA. Moreover, the most of the mentioned parameters were enhanced by 132.98%, 170.59%, 33.82%, 25.86% and 86.14% over the control at the 50 DAS except the CA, N, and P found to be non-significant at this stage. N content was found to be non-significant also at 70 DAS. Similarly, yield parameters were enhanced also by 123.49%, 44.76%, 41.38%, 111.76% and 1.64% respectively at harvest over control except iodine value. The objective of this experiment is to enhance the quality of sunflower constituents through application of best concentration and soaking time of GA.

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“…Peat & Tobin (1996) verificaram em cevada que as atividades dessas enzimas variaram em função da fonte de nitrogênio utilizada. Chanda et al (1998) obtiveram resultados com plântulas de mostarda, mostrando que o ácido giberélico (GA 3 ) estimulou a atividade da GS na raiz e no coleóptilo e inibiu nos cotilédones. Isso indica que a atividade das enzimas GS e GOGAT pode apresentar algum tipo de regulação hormonal.…”

Section: Introductionunclassified

“…Há evidências de que a GS poderia estar sujeita a diversos tipos de controles, dentre os quais estão a repressão e ativação em resposta a diferentes aminoácidos e fitormônios (Chanda et al 1998).…”

Section: Introductionunclassified

Efeito do ácido giberélico e diferentes aminoácidos sobre as atividades da sintetase da glutamina e sintase do glutamato e sobre o crescimento de frutos de soja

Nascimento¹,

Mosquim²

2004

Rev. bras. Bot.

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-(Effect of the gibberellic acid and different aminoacids on the activities of glutamine synthetase and glutamate synthase, and on growth of soybean fruits). The work had as objective to evaluate the effect of different aminoacids and of the gibberelic acid (GA) on the activity of glutamine synthetase (GS) and glutamate synthase (GOGAT) and the growth of soybean fruits. Immature fruits were cultivated with different paclobutrazol (PBZ) concentrations, inhibitor gibberellin synthesis, which it inhibited the growth of the fruits in up to 80%. In a second stage, the effect of the GA was evaluated on the growth of the soybean fruits cultivated with PBZ. The growth regulator reestablished the growth of the cultivated fruits with 0,034 mM PBZ. However, with 0,85 mM PBZ it was not obtained the same positive effect, indicating a possible level phytotoxic. Following fruits was cultivated during eight days, with glutamine, asparagine or allantoine, with or without GA, after which the enzymatic activities were determined. The enzymes of assimilation of the nitrogen went more active under presence of the allantoine. The GA inhibited the GS activity and it stimulated the of Fd-GOGAT and of NADH-GOGAT. The Fd-GOGAT activity went superior of the NADH-GOGAT, perhaps due to reduced ferredoxin in the cultivated fruits under constant illumination, advent of the photosynthetic. The results indicate that, probably, gibberellins are involved in the growth of immature fruits of soybean and in regulation enzymatic activities of the GS and GOGAT in that fruits.Key words -aminoacids, gibberellin, growth regulator, nitrogen, paclobutrazol RESUMO -(Efeito do ácido giberélico e diferentes aminoácidos sobre as atividades da sintetase da glutamina e sintase do glutamato e sobre o crescimento de frutos de soja). O trabalho teve como objetivo avaliar o efeito de diferentes aminoácidos e do ácido giberélico (GA) sobre a atividade da glutamina sintetase (GS) e da glutamato sintase (GOGAT) e o crescimento de frutos de soja. Frutos imaturos foram cultivados com diferentes concentrações de paclobutrazol (PBZ), inibidor da biossíntese de giberelinas, o qual inibiu o crescimento dos frutos em até 80%. Em seguida foi avaliado o efeito do GA sobre o crescimento dos frutos de soja cultivados com PBZ. O regulador de crescimento restabeleceu o crescimento dos frutos cultivados com 0,034 mM de PBZ. Entretanto, com 0,85 mM de PBZ não se obteve o mesmo efeito positivo, indicando um possível nível fitotóxico. Posteriormente os frutos foram cultivados durante oito dias com glutamina, asparagina ou alantoína, na presença ou não de GA, após o que determinaram-se as atividades enzimáticas. As enzimas de assimilação do nitrogênio foram mais ativas na presença da alantoína. O GA inibiu a atividade da GS e estimulou as da Fd-GOGAT e da NADH-GOGAT. A atividade da Fd-GOGAT foi superior à da NADH-GOGAT, talvez devido à ferredoxina reduzida presente nos frutos cultivados sob iluminação constante, advinda da atividade fotossintética. Os resultados obtidos permite...

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Influence of plant growth regulators on some enzymes of nitrogen assimilation in mustard seedlings

Cited by 10 publications

References 20 publications

Nitrogen Metabolism in Pepper Plants Applied with Different Bioregulators

Nitrogen Metabolism in Pepper Plants Applied with Different Bioregulators

Augmentation of Dry Matter Production, Photosynthetic Enzymes, Yield Attributes and Quality Parameters of Sunflower through Seed Priming Effect of Gibberellic Acid—A Multifaceted Hormone

Efeito do ácido giberélico e diferentes aminoácidos sobre as atividades da sintetase da glutamina e sintase do glutamato e sobre o crescimento de frutos de soja

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