Adaptability and stability of wheat genotypes according to the phenotypic index of seed vigor

Vinícius Jardel Szareski,Tiago Zanatta Aumonde,Velci Queiróz De Souza,Tiago Pedó,Maicon Nardino,Alexandre Moscarelli Levien,Gustavo Henrique Demari,Francisco Amaral Villela,Kassiana Kehl,Ivan Ricardo Carvalho,Francine Lautenchleger,Simone Morgan Dellagostin

doi:10.1590/s0100-204x2018000600009

Abstract

Abstract: The objective of this work was to evaluate the adaptability and multi-trait stability of wheat (Triticum aestivum) genotypes according to the phenotypic index of seed vigor (PIV). Thirty wheat genotypes were grown in seven environments in the state of Rio Grande do Sul, Brazil, during one crop season. In each environment, a randomized complete block design with three replicates was used. The PIV was elaborated from the following traits: first germination count, germination percentage, accelerated aging, and electrical conductivity. The evaluated phenotypic index makes it possible to define macroenvironments for the production of wheat seeds with high physiological potential and to understand the implications of the genotype x environment interaction. The phenotypic index of seed vigor is effective to rank genotypes considering multi-trait selection related to the vigor of wheat seeds produced in Southern Brazil.

Highlights

Low vigor seeds may result in reduced germination speed and seedling emergence uniformity, which can affect the initial establishment of the crop and the final plant stand, significantly compromising grain yield (Peske et al, 2012)
The analysis of variance revealed a significant interaction among growing environments and wheat genotypes (G x E) for phenotypic index of seed vigor (PIV) estimates
The AMMI analysis showed that only the first axis of the main components representing the sum of squares of the interaction (EPCA1) was significant, explaining 39.6% of the existing variation

Summary

Introduction

Low vigor seeds may result in reduced germination speed and seedling emergence uniformity, which can affect the initial establishment of the crop and the final plant stand, significantly compromising grain yield (Peske et al, 2012). The identification of more stable and adapted genotypes can improve the production of wheat seeds with high physiological performance. The use of isolated methods to measure the physiological attributes of wheat seeds can lead to different interpretations of the physiological potential of a. In this context, the use of the phenotypic index of seed vigor (PIV) can provide an estimative of the multi-trait response of important seed quality traits, such as first count, germination, accelerated aging, and electrical conductivity, in order to obtain accurate and reliable estimates of the physiological performance of wheat seeds. The multi-trait approach has been used in passion fruit (Oliveira et al, 2008) and eucalyptus (Nunes, 2015; Santos et al, 2016); no works dealing with this phenotype index for wheat were found in the literature

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Results