Screening and Evaluation of New Rootstocks from Local Mit-Ghamr Peach for Resistance to Root-Knot Nematodes (Meloidogyne incognita) | ||||
| Damietta Journal of Agricultural Sciences | ||||
| Article 6, Volume 1, Issue 2, July 2022, Page 51-64 PDF (943.67 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/djas.2022.405934 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Elrefaey Eldengawy  1; Galal Eliwa1; Samir Gad2; Hanan Mohamed1
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| 1Pomology Department, Faculty of Agriculture, Damietta University, Egypt | ||||
| 2Zoology Department, Faculty of Agriculture, Mansoura University, Egypt | ||||
| Abstract | ||||
| A greenhouse experiment was conducted to evaluate resistance behavior of six local Mit-Ghamr peach (Prunus persica L.) genotypes (SL = Sultani late, SM= Sultani medium, SE =Sultani early maturity, N= Neely, F = Fark and MA =Mawy) to root-knot nematode (M. incognita) infection, during two successive seasons (2017/18 and 2018/19). The evaluation was carried out by conducting several nematode assays on the root system of the tested peach seedlings, the most important of which was the total damage index (TDI), as well as vegetative and biochemical characteristics (phenols and proline contents in the leaves and roots of seedlings). Nematode and biochemical measurements were dominant in judging the resistance behavior of the tested genotypes, although the vegetative results (seedling length, leaf area increment and root system growth coefficient) showed differences between the tested genotypes. Three genotypes SL, SM and F recorded the highest number of galls, egg masses and second-stage juveniles on the roots of infected seedlings, while MA genotype recorded the lowest values in this regard. The MA genotype was rated as highly resistant (HR) to M. incognita. Also, SE and N genotypes were resistant (R), and all of them recorded TDI significantly lower than SL, SM and F genotypes, which obtained a medium, Susceptible or highly susceptible rank (HS, S or MS) to the nematode, respectively. The proline and phenolic contents of the seedling leaves and roots of resistant genotypes SE, N and MA were much higher than the corresponding values in the other non-resistant genotypes' SL and SM. A significant negative correlation was also observed between the proline content of leaves and roots and TDI. | ||||
| Keywords | ||||
| Peach rootstocks; Root; knot nematode; Resistant; Susceptibility; Proline; Total damage index | ||||
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