International Journal of Industrial Entomology and Biomaterials

Korean Society of Sericultural Science (한국잠사학회)
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Post Infection Physiobiochemical Alteration at Various Intensities of Leaf spot (Myrothecium roridum) in Mulberry

  • Kumar, P.M.Pratheesh (Regional Sericultural Research Station) ;
  • Qadri, S.M.H. (Regional Sericultural Research Station) ;
  • Pal, S.C. (School of Life Sciences, Visva-Bharati) ;
  • Mishra, A.K. (Central Sericultural Research ＆ Training Institute) ;
  • Urs, S.Raje (Central Sericultural Research ＆ Training Institute)
  • Published : 2003.12.01
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Abstract

Changes in biochemical constituents and physiological alteration were studied in various intensities (1-5%, 6-15%, 16-30%, 31-50% and ＞ 50%) of leaf spot (Myrothecium roridum) on mulberry leaves and compared with healthy leaves. Chlorophyll, total soluble sugar and total protein were decreased (P ＜ 0.01), but total phenol increased due to pathogen infection. Changes in biochemical constituents showed significant correlation with intensity of disease. Chlorophyll ($r^2$= 0.92), and protein (($r^2$= 0.83) possessed negative while phenol (($r^2$= 0.61) possessed positive correlation. Photosynthetic rate, transpiration rate, stomatal conductance, moisture content (%) and physiological water use efficiency (pWUE) were decreased, but stomatal resistance increased in the infected leaves. Physiological parameters also possessed significant (P ＜ 0.01) correlation with disease intensity. Photosynthetic rate (($r^2$= 0.96), transpiration rate ($r^2$=0.88), stomatal conductance (($r^2$= = 0.65), physiological water use efficiency (($r^2$= 0.88) and moisture content (r = 0.85) were negatively but stomatal resistance (($r^2$= 0.75) was positively correlated to disease intensities.

Keywords

References

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