INTERNATIONAL JOURNAL OF MODERN AGRICULTURE ISSN 2305-7246

 

 

 

 

 

 

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International Journal of Modern Agriculture, Volume 8, No.2, 2019

ISSN: 2305-7246

 

Inheritance of gene action for yield component traits in bread wheat under normal and drought stress conditions.

 

El-Sherbeny, G. A. R., Khaled, G. A. A., and Haitham, M. A. Elsayed*.

 

Dept. of  Genetics, Fac. Agric., Sohag University, Sohag 82786, Egypt.

*Corresponding author (e-mail: dhaithamm@agr.sohag.edu.eg)

 

Abstract

Twenty eight half diallel crosses among eight diverse parental genotypes of bread wheat were evaluated. The main objective of this study is to identify the gene action of inheritance for the yield component traits. The results demonstrated that, the mean squares of all studied traits were highly significant under normal, drought stress and combined data. The majority of cross combinations had positive significant heterosis over better parent under each environment and combined data, reflecting the prevalence of heterotic effects and non-additive effects.  Non-additive gene action (σ2D) was found to play the major role in the inheritance of studied traits under each environment and their combined data. The parents P1, P3, P6, P7 and P8 were the best general combiner for all the studied traits under the two environments and combined data. The promising crosses which showed desirable specific combining ability (SCA) effects gave also high estimate of useful heterosis.

 

Keywords; Wheat, drought stress, yield component traits, heterosis, half diallel analysis.

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EVALUATION TEA CLONES BASED ON DROUGHT TOLERANCE INDICES AND MULTIVARIATE ANALYSIS

 

Mehdi Rahimi1,*, SanamSafaei-Chaeikar2, Ali Seraji2and Reza Azadi2

 

1Department of Biotechnology, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran.

2Tea Reaserch Center, Horticultural Sciences Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Lahijan, Iran.

*Corresponding author (e-mail: mehdi83ra@gmail.com; mehdi83ra@yahoo.com)

 

Abstract

Drought is one of the problems of today's society and reduces the yield of plants, including tea. A randomized complete block design with 14 tea clones and two replications in two separate designs (drought stress and normal conditions) was done to identify tolerant drought tea clones in year 2017 at Fashalem station, Rasht Iran. The tea leaf yield of clones was measured in both conditions to calculate different indices of drought tolerance. The correlation of GMP, MP, STI and HM indices with normal and drought leaf yield was significantly positive and so were recognized as the best indices for screening tolerant genotypes. Based on cluster analysis as well as biplot results, the tea clones were grouped into three sensitive, semi-sensitive and tolerant groups. Clones 100, 399 and Bazri were identified as tolerant clones. It is also suggested based on the results that grouping of genotypes based on stress tolerance indices and using multivariate statistical methods can be a suitable method for separating tolerant groups of plants to use in breeding programs.

 

Keywords: Cluster analysis, drought Stress; tea; tolerance indices; yield.

 

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