Changes in root-shoot ratio and ion uptake of maize (Zea mays L.) from soil as influenced by a plant growth regulator

Salt stress negatively affects maize growth and yield. Application of plant growth regulator is an effective way to improve crop salt tolerance, therefore reducing yield loss by salt stress. Here, we used a novel plant growth regulator B2, which is a functional analogue of ABA. With the aim to determine whether B2 alleviates salt stress on maize, we studied its function under hydroponic conditions. When the second leaf was fully developed, it was pretreated with 100 µM ABA, 0.01 µM B2, 0.1 µM B2, and 1 µM B2, independently. After 5 days treatment, NaCl was added into the nutrient solution for salt stress. Our results showed that B2 could enhance salt tolerance in maize, especially when the concentration was 1.0 µMol·L−1. Exogenous application of B2 significantly enhanced root growth, and the root/shoot ratio increased by 7.6% after 6 days treatment under salt stress. Compared with control, the ABA level also decreased by 31% after 6 days, which might have resulted in the root development. What is more, B2 maintained higher photosynthetic capacity in maize leaves under salt stress conditions and increased the activity of antioxidant enzymes and decreased the generation rate of reactive oxygen species by 16.48%. On the other hand, B2 can enhance its water absorption ability by increasing the expression of aquaporin genes ZmPIP1-1 and ZmPIP1-5. In conclusion, the novel plant growth regulator B2 can effectively improve the salt tolerance in maize.

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AÇÃO DE BIOESTIMULANTE NO DESENVOLVIMENTO INICIAL DO MILHO DOCE SUBMETIDO AO ESTRESSE SALINO

Irriga ◽

10.15809/irriga.2016v1n01p191-204 ◽

2018 ◽

Vol 1 (01) ◽

pp. 191

Author(s):

Rafaela Cristina da Cunha ◽

Francisco De Assis de Oliveira ◽

Maria Williane de Lima Souza ◽

José Francismar de Medeiros ◽

Luan Alves Lima ◽

...

Keyword(s):

Zea Mays ◽

Salt Stress ◽

Plant Growth ◽

Growth Regulator ◽

Irrigation Water ◽

Plant Growth Regulator ◽

Seed Treatment ◽

Sweet Corn ◽

Dry Weight ◽

Saline Irrigation

AÇÃO DE BIOESTIMULANTE NO DESENVOLVIMENTO INICIAL DO MILHO DOCE SUBMETIDO AO ESTRESSE SALINO RAFAELA CRISTINA DA CUNHA1; FRANCISCO DE ASSIS DE OLIVEIRA1; MARIA WILLIANE DE LIMA SOUZA1; JOSÉ FRANCISMAR DE MEDEIROS1; LUAN ALVES LIMA1; MYCHELLE KARLA TEIXEIRA DE OLIVEIRA1 1 Departamento de Ciências Ambientais e Tecnológicas, UFERSA; Avenida Francisco Mota, 572, 59625-900, Bairro Costa e Silva, Mossoró, RN, Brasil, e-mail: [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected] 1 RESUMO A utilização de água salina na agricultura é um grande desafio para pesquisadores e agricultores, pois sua utilização está condicionada a adoção de tecnologias que minimizem o efeito do estresse salino sobre as plantas. Neste contexto, o presente trabalho foi desenvolvido com o objetivo de avaliar o uso de bioestimulante como agente amenizador do estresse salino na cultura do milho doce. O delineamento experimental utilizado foi inteiramente casualizado, em esquema fatorial 2 x 4, sendo dois níveis de salinidade da água de irrigação (0,5 e 4,5 dS m-1) e quatro doses de bioestimulante aplicado via tratamento de sementes (0, 5, 10 e 20 mL kg-1 de sementes). A avaliação das plantas foi realizada aos 45 dias após a semeadura, analisado as seguintes variáveis: altura de plantas, diâmetro do colmo, número de folhas, área foliar, massa seca de colmo, massa seca de folhas, massa seca de raiz, massa seca de pendão e massa seca total. A utilização de água salina na irrigação provocou redução na maioria das variáveis de crescimento do milho doce, sendo o efeito mais expressivo sobre o desenvolvimento foliar. O tratamento de sementes com Stimulate® promove o desenvolvimento de plantas de milho doce apenas na ausência de estresse salino, não sendo eficiente como agente atenuador do efeito da salinidade, além disto, o uso de água salina na irrigação do milho inibiu o efeito benéfico do Stimulate® no desenvolvimento do milho doce. Palavras-chave: Zea mays, fitorregulador, qualidade de água CUNHA, R. C; OLIVEIRA, F. A.; SOUZA, M. W. L.; MEDEIROS, J. F.; LIMA, L. A.; OLIVEIRA, M. K. T.ACTION BIOSTIMULANT NO INITIAL DEVELOPMENT OF SWEET CORN UNDER SALT STRESS 2 ABSTRACT The use of saline water in agriculture is a major challenge for researchers and farmers, because its use is subject to the adoption of technologies that minimize the effect of salt stress on plants. In this context, the present work was intended to evaluate the use of plant growth regulator as softening agent of salinity stress on the sweet corn crop. The experimental design was completely randomized, factorial 2 x 4, with two salinity levels of irrigation water (0.5 and 4.5 dS m-1) and four doses of plant growth regulator applied as seed treatment (0, 5, 10 and 20 ml kg-1 seed). The evaluation of the plants was carried out 45 days after sowing, and the following variables were analyzed: plant height, stem diameter, number of leaves, leaf area, dry weight of stem, leaf dry weight, root dry weight, dry weight tassel and total dry mass. The use of saline irrigation water caused a reduction in most growth variables of sweet corn, the most significant effect being on leaf development. The seed treatment Stimulate® promotes the development of sweet corn plants only in the absence of salt stress, there being effective for diminishing the effect of salinity agent, moreover, the use of saline irrigation water in maize inhibit the beneficial effect of Stimulate® in the development of sweet corn. Keywords: Zea mays, plant regulators, water quality

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Influence of plant growth regulator and rhizobial inoculation on nodulation and soybean nitrogen contant

Cereal Research Communications ◽

10.1556/crc.35.2007.2.207 ◽

2007 ◽

Vol 35 (2) ◽

pp. 993-996 ◽

Cited By ~ 1

Author(s):

Sulejman Redžepović ◽

Sanja Sikora ◽

Josip Čolo ◽

Mihaela Blažinkov ◽

Marija Pecina

Keyword(s):

Plant Growth ◽

Growth Regulator ◽

Plant Growth Regulator ◽

Rhizobial Inoculation

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Effect of plant growth promoting bacteria and drought on spring maize (Zea mays L.)

Pakistan Journal of Botany ◽

10.30848/pjb2021-2(38) ◽

2020 ◽

Vol 53 (2) ◽

Author(s):

Muhammad Mubeen ◽

Asghari Bano ◽

Barkat Ali ◽

Zia Ul Islam ◽

Ashfaq Ahmad ◽

...

Keyword(s):

Zea Mays ◽

Plant Growth ◽

Zea Mays L ◽

Plant Growth Promoting Bacteria ◽

Spring Maize ◽

Plant Growth Promoting ◽

Growth Promoting

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Potential Toxicity of Plant Growth Regulator Gibberellic acid (GA3) on the Pancreatic Structures and Functions in the albino rat

Academia Anatomica International ◽

10.21276/aanat.2016.2.2.4 ◽

2016 ◽

Vol 2 (2) ◽

Cited By ~ 1

Author(s):

Olfat A. Abd-El- Aty ◽

Rehab A. Masoud

Keyword(s):

Plant Growth ◽

Gibberellic Acid ◽

Growth Regulator ◽

Plant Growth Regulator ◽

Potential Toxicity ◽

Albino Rat

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Gluconacetobacter diazotrophicus Pal5 Enhances Plant Robustness Status under the Combination of Moderate Drought and Low Nitrogen Stress in Zea mays L.

Microorganisms ◽

10.3390/microorganisms9040870 ◽

2021 ◽

Vol 9 (4) ◽

pp. 870

Author(s):

Muhammad Aammar Tufail ◽

María Touceda-González ◽

Ilaria Pertot ◽

Ralf-Udo Ehlers

Keyword(s):

Zea Mays ◽

Plant Growth ◽

Zea Mays L ◽

Growth Promotion ◽

Nitrogen Stress ◽

Rrna Gene ◽

N Fixation ◽

Gluconacetobacter Diazotrophicus ◽

Maize Plants ◽

Low Nitrogen

Plant growth promoting endophytic bacteria, which can fix nitrogen, plays a vital role in plant growth promotion. Previous authors have evaluated the effect of Gluconacetobacter diazotrophicus Pal5 inoculation on plants subjected to different sources of abiotic stress on an individual basis. The present study aimed to appraise the effect of G. diazotrophicus inoculation on the amelioration of the individual and combined effects of drought and nitrogen stress in maize plants (Zea mays L.). A pot experiment was conducted whereby treatments consisted of maize plants cultivated under drought stress, in soil with a low nitrogen concentration and these two stress sources combined, with and without G. diazotrophicus seed inoculation. The inoculated plants showed increased plant biomass, chlorophyll content, plant nitrogen uptake, and water use efficiency. A general increase in copy numbers of G. diazotrophicus, based on 16S rRNA gene quantification, was detected under combined moderate stress, in addition to an increase in the abundance of genes involved in N fixation (nifH). Endophytic colonization of bacteria was negatively affected by severe stress treatments. Overall, G. diazotrophicus Pal5 can be considered as an effective tool to increase maize crop production under drought conditions with low application of nitrogen fertilizer.

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