Aly,, A., Tag E I-Din, M., Mansour, M., Hussein, E. (2005). USE OF AMINO ACID COMPOSITION OF SEED TO QUANTIFY RESISTANCE OF FLAX CULTIVARS TO POWDERY MILDEW DISEASE. Journal of Plant Production, 30(2), 861-868. doi: 10.21608/jpp.2005.237133
A. A. Aly,; M. A. Tag E I-Din; M. T.M. Mansour; E. M. Hussein. "USE OF AMINO ACID COMPOSITION OF SEED TO QUANTIFY RESISTANCE OF FLAX CULTIVARS TO POWDERY MILDEW DISEASE". Journal of Plant Production, 30, 2, 2005, 861-868. doi: 10.21608/jpp.2005.237133
Aly,, A., Tag E I-Din, M., Mansour, M., Hussein, E. (2005). 'USE OF AMINO ACID COMPOSITION OF SEED TO QUANTIFY RESISTANCE OF FLAX CULTIVARS TO POWDERY MILDEW DISEASE', Journal of Plant Production, 30(2), pp. 861-868. doi: 10.21608/jpp.2005.237133
Aly,, A., Tag E I-Din, M., Mansour, M., Hussein, E. USE OF AMINO ACID COMPOSITION OF SEED TO QUANTIFY RESISTANCE OF FLAX CULTIVARS TO POWDERY MILDEW DISEASE. Journal of Plant Production, 2005; 30(2): 861-868. doi: 10.21608/jpp.2005.237133
USE OF AMINO ACID COMPOSITION OF SEED TO QUANTIFY RESISTANCE OF FLAX CULTIVARS TO POWDERY MILDEW DISEASE
1Plant Pathology Research Institute, Agricultural Research Center, Giza, Egypt.
2Department of Agricultural Biochemistry, Faculty of Agriculture, Am Shams Univ., Shoubra El-Rheima, Cairo, Egypt.
Abstract
A field trial was conducted in 2002/2003 and 2003/2004 growing seasons at
Giza Agricultural Research Station to evaluate the reactions of ten flax cultivars to
powdery mildew (PM) disease. In general, the tested cultivars could be divided into
four distinct groups, i.e., highly resistant (Ottowa 770 B, Dakota, and Bombay),
resistant (Cass, Wilden, and Clay), susceptible (Koto and Marshall), and highly
susceptibie (Cortland and C.l. 2008). The cultivais showed considerable variation in
disease severity (DS) ranged from 3.69 on Bombay to 100% on Ci. 2008. GLC
analysis of amino acid composition of cultivar seeds revealed the presence of 18
amino acids. Regarding mean percentages of the separated amino acids, glutamic
add showed the highest value (2029%), while tryptophan showed the lowest value
(0.45%). The other amino acids showed intermediate values between these two
extremes. DS was positively correlated with serine (r= 0.858, P< 0.01). On the other
hand, none of the other amino acids was significantly correlated with DS. Data for DS
ratings and amounts of amino acids were entered into a computerized stepwise
multiple regression analysis. Using the predictors supplied by stepwise regression, a
six-factor model was constructed to predict PM severity. This model showed that PM
severity differences were due largely to the amino acids serine, threonine, isoleucine,
leucine, alanine and valine, which accounted for 99.83% of the total variation in DS.
These results indicate that amino acid composition of linseed may provide a
supplementary assay to greenhouse and field tests to distinguish quantitatively
between. PM resistant and susceptible genotypes.
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