Presença de nematoides em plantas de soja: relação com a ocorrência de sementes esverdeadas e seu potencial fisiológico

Forti, Victor Augusto

doi:10.11606/t.11.2013.tde-27052013-161336

Cited by 1 publication

(1 citation statement)

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“…Despite this, the ascendent movement of A. besseyi was well characterised by the increase in the population density found inside roots from stems + petioles + inflorescences and leaves, reaching mean rates of more than 123, 330 and 430%, respectively, in a month. This suggests a flux of nematode movement from roots to shoots during the soybean development, with a great accumulation of specimens in the leaves at the end of the experimental period, which was already reported in soybean plants (Favoreto et al, 2015(Favoreto et al, , 2017; however, previous studies did not stain nematodes inside plant tissues to confirm this hypothesis. In addition, from 19 DAI eggs were observed in the tissues but in higher numbers in the nodes and inflorescences, suggesting that these regions are preferable for feeding and multiplication of A. besseyi in soybean.…”

Section: Discussionsupporting

confidence: 62%

Host-parasite relationship between Aphelenchoides besseyi and soybean

et al. 2022

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Summary Aphelenchoides besseyi is a concern to Brazilian agriculture, since the losses caused by the green stem and foliar retention syndrome in soybean, especially in hot and humid climates, could reach high levels. However, limited information is available regarding the host-parasite relationship. The objective of this study was to evaluate the capacity of A. besseyi to penetrate soybean roots and its movement in soybean tissues until reaching the top parts. Plants inoculated with 1000 A. besseyi were evaluated for root penetration from 1-28 days after inoculation (DAI), and post-penetration and movement inside tissues by staining them with acid fuchsin. Plant development, chronology of the symptoms and the number of pods were also evaluated at 60 DAI. Aphelenchoides besseyi was found in the cortex and xylem vessels of roots from 1 DAI. During the experimental period, the number of nematodes from roots to shoots increased more than 123, 330 and 430%, respectively, for roots, stems + petioles + inflorescences, and leaves, demonstrating the ascendent movement of A. besseyi. Necrotic lesions in young leaves and apical tissues were observed from 8 DAI; the typical symptom of ‘amachamiento’ was observed from 10 DAI, with enlargement of nodes and lesions in inflorescences and, at 30 DAI, stunted plants were detected. At 60 DAI, inoculated plants had lower numbers of pods and exhibited severe symptoms including abortion of flowers and tissue splitting and cortical lesions in a few pods and roots. These observations emphasise the importance of A. besseyi for Brazilian soybean production.

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Section: Discussionsupporting

confidence: 62%