Plant Productions

Effects of Different Concentrations of Cytokinin and Auxin Hormones on Yield and Yield Components of Grain Maize (Zea mays L.) in Salinity Conditions

D. Davani; M. Nabipour; H. Roshanfekr Dezfouli

Volume 40, Issue 1 , June 2017, , Pages 69-80

https://doi.org/10.22055/ppd.2016.12433

Abstract

Background and Objectives Maize (Zea mays L.) belongs to the family of Poaceae and it is the third important cereal crop of the World after wheat and rice. Salinity is one of the major ... Read More Background and Objectives Maize (Zea mays L.) belongs to the family of Poaceae and it is the third important cereal crop of the World after wheat and rice. Salinity is one of the major environmental factors limiting plant growth and productivity. Maize is sensitive to salinity. Ba is one of the cytokinins known to significantly improve the growth of crop plants grown under salinity. IBA is also known to play a significant role in plant tolerance to salt stress. However, little information appears to be available on the relationship between salinity tolerance and auxin or cytokinins levels in plants. In this respect, the objective of this study was to study the effects of sprying of cytokinin and auxin hormones on yield and yield components of grain maize in saline conditions. Materials and Methods To study the effects of cytokinin (0, 75 and 100 mg.l-1) and auxin (0, 15, 20 mg.l-1) hormones on yield and its components of grain maize (Zea mays L.) under saline conditions, an experiment was conducted during 2013 in the research station of Bushehr Agricultural and Natural Resources Research Center in a factorial design based on randomized complete design with three replications. Cytokinin (Benzyl Adenine, Merck) and Auxin (Indole-3-Butiric Acid, Merck) were sprayed on the entire plant in the evening. Data was analyzed using the SAS (Ver.9.1) and significance of the differences between the means was conducted using LSD test. Results Results of Analysis of Variance showed that the highest grain yield was obtained by application of cytokinin and auxin with concentrations of 100 and 20 mg.l-1, respectively. The characteristics of plant height, stem diameter, ear length, row number per Ear and biological yield increased by sprying 100 mg.l-1 cytokine. In the treatment of without spraying auxin, the highest kernel number per row was obtained by spraying cytokinin at 75 mg.l-1 while in the treatment spraying auxin at 15 and 20 mg.l-1 the highest kernel number per row was obtained by sprying 100 mg.l-1 cytokinin. In three levels of cytokinin, application of auxin increased 1000 kernel weight. The highest harvest index was obtained by application of auxin at 20 mg.l-1. Discussions It has been found that both auxin and cytokinin may have a role in mediating cell division in the endosperm during the grain-filling stage. Therefore, these hormones might regulate the grain capacity (sink size) for the accumulation of carbohydrates. It was found that IAA actively participated in the mobilization and accumulation of carbohydrates in seeds. Auxin and cytokinins hormones are also thought to be involved in regulating sink strength either by mediating the division and enlargement of endosperm cells or by controlling the import of assimilates to the sink. Results of this study demonstrated that sprying cytokinin at 100 mg.l-1 and auxin at 20 mg.l-1 reduced the effects of salinity on yield and increased the grain yield.

Relationship between accumulation of nitrogen compounds and sugars, and salt tolerance in rapeseed plant (Brassica napus L.)

V. Atlassi Pak; M. Nabipour; M. Meskarbashee

Volume 39, Issue 1 , June 2016, , Pages 1-1

https://doi.org/10.22055/ppd.2016.11951

Abstract

Abiotic stresses, like salinity, cause an increase in nitrogen compounds such as proline and soluble proteins in plant. In order to investigate the role of these compounds in salt tolerance, ... Read More

Investigating of grain growth and contribution of stem reserves in grain yield of barley (Hordeum vulgare L.) cultivars under terminal drought conditions.

M. Pureisa; M. Nabipour; M. Meskarbashee

Volume 38, Issue 1 , May 2015, , Pages 41-53

https://doi.org/10.22055/ppd.2015.11117

Abstract

The duration of grain filling period and the rate of this period determines final grain weight in barley. In this study, in order to investigate the effect of final drought stress on ... Read More

Effect of different levels of potassium on soluble carbohydrate remobilization in two bread wheat cultivars (Triticum aestivum L.)

A. Alizadeh; M. Nabipoor; A. Rahnama

Volume 37, Issue 3 , December 2014, , Pages 69-82

Abstract

Side transportation of storage carbohydrates is one of the most important physiological indices in yield formation. In order to study potassium variation levels (200, 300 and 400 mg ... Read More

Responses of bread wheat genotypes to heat stress during grain filling period under Ahvaz conditions

M. Mojtabaie Zamani; M. Nabipour; M. Meskarbashee

Volume 37, Issue 4 , March 2014, , Pages 119-130

Abstract

In order to study the effect of heat stress during grain filling period on yield, yield components, grain filling rate and duration, a field experiment was carried out during 2010-2011 ... Read More

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Author = M. Nabipour

Effects of Different Concentrations of Cytokinin and Auxin Hormones on Yield and Yield Components of Grain Maize (Zea mays L.) in Salinity Conditions

Abstract

Relationship between accumulation of nitrogen compounds and sugars, and salt tolerance in rapeseed plant (Brassica napus L.)

Abstract

Investigating of grain growth and contribution of stem reserves in grain yield of barley (Hordeum vulgare L.) cultivars under terminal drought conditions.

Abstract

Effect of different levels of potassium on soluble carbohydrate remobilization in two bread wheat cultivars (Triticum aestivum L.)

Abstract

Responses of bread wheat genotypes to heat stress during grain filling period under Ahvaz conditions

Abstract