The role of nitrogen, amino acids and phenols in resistance of tomato to root-knot nematodes


  • Y. D. Narayana
  • D. D. R. Reddy


Narayana and Reddy (1980) have shown that the tomato variety NTDR-1 exhibited a high degree of resistance to Meloidogyne incognita and M. javanica by limiting larval invasion and preventing development of any nematodes within the roots. Free amino acids content of the host tissue has been related to susceptibility or resistance of plants to various organisms (Lakshminarayan, 1955; Myuge, 1956). Increased phenolic content was considered to be contributory factor in the resistance to various nematode infections (Zuckerman, 1971; Singh and Choudhury, 1973; Sivapalan and Sivanatharajan, 1974). The present study was made to determine whether there are any differences in the total nitrogen, the quality and quantity of total amino acids, and the quantity of free total phenolics and chlorogenic acid in shoots and roots of tomato «NTDR-1 » resistant to root-knot nematodes, compared with the susceptible « Pus a Ruby».