Morphological and Morphometric Characterization of Pratylenchus Species in Sugarcane Cropping Areas of Pernambuco State

Abstract

The root-lesion nematodes Pratylenchus spp. have a wide geographic distribution and a large number of host plants. These migratory endoparasites are found associated with sugarcane around the world causing diseases that induce permanent losses in productivity. Although this genus has ordinarily been reported in low-producing sugarcane areas in northeastern Brazil, studies of the species occurrence are few and restricted to a very low number of sites and samples. This study aimed to morphologically and morphometrically characterize Pratylenchus species from different sugarcane regions of Pernambuco state, where composite samples of soil and roots were collected on 30 farms from three sugarcane mills. The external morphological characters of the nematode body from different populations had a diagnostic value compatible with those obtained in the literature, showing the dominance of P. zeae (87%) in the region. Atypical populations of the genus Pratylenchus were also found.

Nematodes associated with andean papaya (Carica pubescens L.) in Sandia, Puno, Peru

“…In crops of coffee in the Sandia district, Pratylenchus body length is shorter (Mayta, 2017). On the other hand, in samples from potato and corn it has been found body lengths of 682 and 555 µm, respectively (Flores et al, 2017; Lima et al, 2017); those figures are close to ours and inside the range described by Lira et al (2014), De Souza (2018) and De Jesus et al (2020). Morphometric studies that detected variations between populations of Pratylenchus attributed to origin (geographical area or host plant) the cause of differences (Olowe and Corbett, 1984).…”

The phytonematodes species on sugarcane plants (Saccharum officinarum L.) at Subang Sugar Factory PT PG Rajawali II, West Java

“…P. zeae became the dominant phytonematode with the abundant population in sugarcane root and soil samples, this has also been reported in sugarcane in Tanzania and Brazil [10,12]. In addition, the abundance of Helicotylenchus sp.…”

“…(Figure 3). The morphology of Pratylenchus zeae is characterized by flat lips, lip region is not set off from the body, slightly squared, short stylet, flat stylet knob, oval median bulb, monodelphic vulva position, vulva splitting, and splitting protruding from the cuticle of the body, vulva position 60-77%, spermatheca round and small, post-vulval uterus sac is short, tail slightly tapered at the end, and this nematode is parthenogenic [10]. The female morphology of Xiphinema setariae is characterized by having an odontostile type, a body that is longer than other nematodes, in the anterior stylet, there is a needle-shaped odontostile that extends towards the anterior lip, the lip region has an indentation that separated it from the rest of the body, and tail shaped like a conoid with digitate terminus [18].…”

“…Phytonematodes as the cause of plant diseases are widely reported in almost all sugarcane growing countries [5]. Phytonematodes in sugarcane have been widely reported in several other countries, including China [6], South Africa [7], India [8], Nigeria [4], Japan [9], and Brazil [10]. In Indonesia, the initial study of phytonematodes in sugarcane was first reported in 1976-1978 in seven sugar mill areas in East Java [11].…”