Abstract:
:The vascular pathogen Xanthomonas oryzae pv. oryzae (Xoo) and nonvascular pathogen Xanthomonas oryzae pv. oryzicola (Xoc) cause bacterial blight (BB) and bacterial leaf streak (BLS) diseases of rice, respectively. We have previously identified the avirulence gene avrXa27 from Xoo PXO99(A), which specifically induces the expression of the rice resistance gene Xa27, ultimately leading to resistance against BB disease in rice. In this study, we have generated a transgenic rice line (L24) that expresses avrXa27 constitutively under the control of the PR1 promoter, and have examined its role in the host-pathogen interaction. L24 is not more susceptible to BB, indicating that avrXa27 does not contribute to virulence. AvrXa27 retains avirulence activity in L24 and, after crossing with a line containing Xa27, progeny display phenotypic changes including inhibition of tillering, delay in flowering, stiff leaves, early leaf senescence and activation of pathogenesis-related (PR) genes. On challenge with a variety of compatible strains of Xoo and Xoc strain L8, lines with both avrXa27 and Xa27 also show enhanced resistance to bacterial infection. The induction of Xa27 and subsequent inhibition of Xoc growth in Xa27 plants are observed on inoculation with Xoc L8 harbouring avrXa27. Our results indicate that the heterologous expression of avrXa27 in rice containing Xa27 triggers R gene-specific resistance and, at the same time, confers enhanced resistance to compatible strains of Xoo and Xoc. The expression of AvrXa27 and related proteins in plants has the potential to generate broad resistance in plants.
journal_name
Mol Plant Patholjournal_title
Molecular plant pathologyauthors
Tian D,Yin Zdoi
10.1111/j.1364-3703.2008.00509.xsubject
Has Abstractpub_date
2009-01-01 00:00:00pages
29-39issue
1eissn
1464-6722issn
1364-3703pii
MPP509journal_volume
10pub_type
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