Year: 2013 | Month: December | Volume 6 | Issue 4
Reaction of Banana Hybrids (Phase-II) for Resistance to Meloidogyne incognita
Abstract: <div>Plant parasitic nematodes are one of the major biotic stresses affecting banana production. Breeding works carried out at the Department of Fruit crops, Tamil Nadu Agricultural University (TNAU), India. The potential diploids and hybrids developed were crossed with commercial triploids to develop primary tetraploids and improved diploids. The susceptible check cultivar used was</div><div>Rasthali (AAB), while the resistant reference cultivar used Pisang Lilin (AA). Banana suckers of uniform size and weight were collected, pared and planted in earthen part containing 5 kg sterilized pot mixture. Egg masses of M. incognita were picked from roots, allowed to hatch in a beaker of distilled water and the hatched juveniles (J2) were inoculated in the rhizosphere of the</div><div>hybrids by soil injection method @ 5,000 nematodes / pot. Same set of replicated banana hybrids were also maintained as uninoculated check. The reactions of nineteen new synthetic banana phase II hybrids to Meloidogyne incognita was studied under field conditions as well as in controlled inoculation tests in pots. Hybrid H 531 (Poovan x Pisang Lilin) was found to be resistant and six hybrids, H-02-34, H-03-05, H-03-13, H-04-12, H-04-24 and NPH-02-01 were found to be toterant to the root-knot nematode, Meloidogyne incognita while the remaining were rated as susceptible and highly susceptible ones. Total phenols and PO, PPO, PAL and enzymatic activity of the hybrids in defense mechanism in response to nematode invasion indicated higher activities in resistant genotypes compare to susceptible ones. Hybrid H 531 had the maximum biochemical content and enzyme</div><div>activity among the hybrids included in this study. The resistant and tolerant hybrids had enhanced contents of total phenol, PO, PPO and PAL.</div>
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