Genotype-environment interactions affecting preflowering physiological and morphological traits of Brassica rapa grown in two watering regimes.
J Exp Bot
; 65(2): 697-708, 2014 Feb.
Article
de En
| MEDLINE
| ID: mdl-24474811
ABSTRACT
Plant growth and productivity are greatly affected by drought, which is likely to become more threatening with the predicted global temperature increase. Understanding the genetic architecture of complex quantitative traits and their interaction with water availability may lead to improved crop adaptation to a wide range of environments. Here, the genetic basis of 20 physiological and morphological traits is explored by describing plant performance and growth in a Brassica rapa recombinant inbred line (RIL) population grown on a sandy substrate supplemented with nutrient solution, under control and drought conditions. Altogether, 54 quantitative trait loci (QTL) were identified, of which many colocated in 11 QTL clusters. Seventeen QTL showed significant QTL-environment interaction (Q×E), indicating genetic variation for phenotypic plasticity. Of the measured traits, only hypocotyl length did not show significant genotype-environment interaction (G×E) in both environments in all experiments. Correlation analysis showed that, in the control environment, stomatal conductance was positively correlated with total leaf dry weight (DW) and aboveground DW, whereas in the drought environment, stomatal conductance showed a significant negative correlation with total leaf DW and aboveground DW. This correlation was explained by antagonistic fitness effects in the drought environment, controlled by a QTL cluster on chromosome A7. These results demonstrate that Q×E is an important component of the genetic variance and can play a great role in improving drought tolerance in future breeding programmes.
Mots clés
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Brassica
/
Eau
/
Caractère quantitatif héréditaire
/
Fleurs
/
Environnement
Type d'étude:
Prognostic_studies
Langue:
En
Journal:
J Exp Bot
Sujet du journal:
BOTANICA
Année:
2014
Type de document:
Article
Pays d'affiliation:
Pays-Bas