New Zealand Journal of Crop and Horticultural Science
abstracts
Promising genetic resources for resistance to powdery mildew in chestnut rose
(Rosa roxburghii) and its relatives in China
X. Wen
National Key Laboratory of Crop Genetic Improvement
Huazhong Agricultural University
Wuhan 430070, People’s Republic of China
Guizhou Key Laboratory of Agricultural Bioengineering
Guizhou University
Guiyang 550025, People’s Republic of China
Q. Xu
Q. Cao
X. Deng
National Key Laboratory of Crop Genetic Improvement
Huazhong Agricultural University
Wuhan 430070, People’s Republic of China
email: xxdeng@mail.hzau.edu.cn
Abstract Chestnut rose (Rosa roxburghii) shows promising
prospects both in fruit exploitation and ornamental plant genetic improvement.
Powdery mildew is the most destructive fungal disease of this species and its
relatives. The infection date, disease duration, peak disease indexes (PDI),
and area under the disease progress curve (AUDPC) values were used to rate
the resistance to powdery mildew disease in seven genotypes of chestnut rose
and their eight relatives. R.
sterilis, R. kweichonensis, R. laevigata, R. lucidissima,
and R. chinensis were free from powdery mildew, whereas R. multiflora var. multiflora and R.
multiflora var. cathayensis were the most susceptible to this
disease. Of the genotypes from R. roxburghii, ‘Guinong No. 6’ exhibited a
significantly high level of resistance with striking brown necrotic lesions
in its leaves, whereas ‘Guinong No. 5’ and ‘Guinong No. 2’ showed
the most susceptibility. The resistance ratings identified by AUDPC
were significantly correlated with those characterised by PDI. Therefore, it
is suggested that the latter is used in the resistance ratings because of its
simplicity.
Keywords powdery mildew; relatives; resistance; chestnut rose; Rosa
roxburghii
New Zealand Journal of Crop and Horticultural Science, 2006, Vol. 34:
183–188
0014–0671/06/3402–0183 © The Royal
Society of New Zealand 2006
H05105; Online publication date 27 April 2006. Received 9 September
2005; accepted 18 January 2006
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