Variation for kernel number and related traits in triticale (x Triticosecale Wittmack)
Rosella Motzo A B , Simona Bassu A and Francesco Giunta A
+ Author Affiliations
- Author Affiliations
A Dipartimento di Scienze agronomiche e Genetica vegetale agraria, Facoltà di Agraria, Università di Sassari, Italy, Via De Nicola, 07100 Sassari, Italy.
B Corresponding author. Email: motzo@uniss.it
Crop and Pasture Science 62(10) 823-829 https://doi.org/10.1071/CP11192
Submitted: 21 July 2011 Accepted: 10 November 2011 Published: 6 December 2011
Abstract
Assessing the existence and extent of genetic variation in kernel number per m2 (KNO) and in KNO-related traits is necessary both for overcoming sink limitations through breeding and in order to correctly model triticale grain yield. A set of 112 advanced breeding lines derived from various crosses between winter and spring hexaploid triticales was grown for 2 years in a field experiment to evaluate genetic variation and heritability for KNO, chaff weight per m2 at maturity (CHAFFW) and number of kernels per unit weight of chaff (K/CHAFF). Genetic correlations were also calculated between these traits and grain weight and yield. K/CHAFF (but not CHAFFW) exhibited a high level of genetic variation and a low contribution of the genotype by environment interaction component to the overall variance and was highly heritable. There was no detectable genetic correlation between K/CHAFF and CHAFFW; however, K/CHAFF was correlated with KNO (r = 0.66, P < 0.001). K/CHAFF fulfils the major requirements of an indirect screening trait for KNO and of a genetic coefficient in modelling.
Additional keywords: chaff weight per m2, genetic coefficient, genetic correlations, heritability, indirect selection, kernels per g of chaff, modelling.
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