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Powdery mildew significantly hampers pea yield and deteriorate its quality as well. The resistance breakdown remained the
main reason for failure in each attempt to incorporate powdery mildew resistance in well adapted pea cultivars. A precise
selection of powdery mildew resistant source is the key to develop high yielding and stable powdery mildew resistant
cultivars. Field screening alone is not an efficient method for making selection for powdery mildew resistance. Different
physiological parameters viz., the concentration of total chlorophyll, chlorophyll b, chlorophyll a: chlorophyll b and the
number of stomata were found to be in a tight positive correlation with disease severity while, the concentration of
chlorophyll a had negative correlation. The differential behaviour of these traits in powdery mildew susceptible and resistant
genotypes has suggested their use as reliable criteria for screening against powdery mildew. A 1-5 scale has been devised for
screening against powdery mildew in pea; where score 1 is for highly resistant and 5 for highly susceptible genotype. The
suggested scale is reliable and reproducible in making selections for powdery mildew resistance
Muhammad Abubakkar Azmat, Asif Ali Khan, Shahid Niaz. (2016) Stomatal Density And Chlorophyll Concentration As An Indicator Of Powdery Mildew Resistance In Pea (Pisum Sativum L.), , Volume-53, Issue-4.
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