Zafar, Zafar Ullah , Athar, Habib-ur-Rehman .
Does Nitrogen Nutrition Modulate Resistance to leaf curl virus (CLCuV) in cotton (Gossypium hirsutum L.)?
Responses of two cultivars of cotton (Gossypium hirsutum L.), S-12 (CLCuV-susceptible) and CIM-448 (CLCuV-resistant), to varying concentrations of N were examined. Plants of the two cultivars were subjected to 224, 114 and 56 mg N L-1 in Hoagland’s nutrient solution. CIM-448 remained free from disease symptoms throughout the experiment, whereas S-12 showed disease symptoms. However, severity of disease symptoms decreased with decreasing external N supply. Growth of both cotton cultivars was increased by increasing external N supply. CLCuV-resistant cultivar, CIM-448 was higher in growth as compared to virus susceptible cultivar S-12 at all external nitrogen regimes. Leaf epicuticular wax content was greater in CIM-448 as compared to that of healthy leaves of S-12. However, the diseased leaves of S-12 had higher epicuticular wax content as compared to those of healthy S-12 and CIM-448. Leaf K+ decreased with decrease in N regimes in both cultivars. However, diseased leaves of S-12 had significantly higher leaf K+ and Ca2+ as compared to those of healthy S-12 and CIM-448. Leaf Mg2+ concentration was higher in CIM-448 as compared that in to diseased or healthy leaves of S-12 at all external N regimes. Accumulation of N decreased significantly with decrease in N levels of the growth medium. However, CIM-448 had higher N content as compared to healthy or diseased leaves of S-12. Leaf P content was inconsistent in both cultivars at varying N regimes. In conclusion, growth of both cotton cultivars increased with increase in external N nutrition, which in turn associated with higher accumulation of N and K accumulation. However, vigorous growth of S-12 cultivar with high N supply enhanced the disease susceptibility due to change in pattern of N and K accumulation at varying external N regimes, whereas disease resistance of CIM-448 remained unaffected at varying external N regimes.
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1 - Bahauddin Zakariya University, Institute of pure and Applied Biology, Multan, 60800, Pakistan
2 - Bahauddin Zakariya University, Institute of pure and Applied Biology, Habib-ur-Rehman Athar, Assistant Professor in Botany,, Inst Pure Appl Biol, Bahauddin Zakariya University, Multan, 60800, Pakistan
cotton leaf curl virus
leaf epicuticular wax
Presentation Type: Oral Paper:Papers for Topics
Date: Wednesday, July 30th, 2008
Time: 1:30 PM