Premium
Loci controlling partial resistance to rice blast do not show marked QTL × environment interaction when plant nitrogen status alters disease severity
Author(s) -
Talukder Zahirul I.,
McDonald A James S.,
Price Adam H.
Publication year - 2005
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.2005.01507.x
Subject(s) - quantitative trait locus , biology , resistance (ecology) , nitrogen , plant disease resistance , blast disease , disease , genetics , agronomy , gene , chemistry , medicine , organic chemistry
Summary• Plant disease susceptibility is often increased by nitrogen (N) application. Therefore, it is important to know if resistance loci are effective in different plant N environments. • One‐hundred lines of the Bala × Azucena rice ( Oryza sativa ) mapping population were grown in two N treatments and tested for partial resistance to blast ( Magnaporthe grisea ) isolate CD100. Disease severity (DS), the number and size of lesions and plant N and C concentrations were measured and the results subject to quantitative trait loci (QTL) and QTL × environment analysis. • There was a 66% higher plant N concentration in the high N treatment and DS increased significantly, mostly as a result of increased numbers of lesions. Nine regions contained QTL for disease traits but only one showed evidence of statistically significant QTL × treatment interaction. This was a large effect quantitative trait locus at marker R1933 on chromosome 12 which was less effective at high N. • Apparently, blast disease is increased by higher plant N, but the efficacy of partial resistance genes is not greatly affected by N application.