Research Article

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03/19/2002
Lactuca sativa L.; Lettuce; Meloidogyne javanica; Nematode; Resistance

Resistance to the root-knot nematodes Meloidogyne spp. would be a valuable attribute of lettuce Lactuca sativa L. cultivars grown in tropical regions. The looseleaf lettuce ‘Grand Rapids’ is resistant to both M. incognita and M. javanica. Resistance to M. incognita has a high heritability, under the control of a single gene locus, in which the ... more

W.Roberto Maluf; S.Márcio Azevedo; L.Antonio Au Gomes; A.Cláudia B. de Oliveira
05/31/2011
Anatomic change; Cassava root anatomy; Manihot anatomy; Manihot fortalezensis; Root secondary growth

Cassava rootstocks of varieties UnB 201 and UnB 122 grafted with scions of Manihot fortalezensis were prepared for anatomic study. The roots were cut, stained with safranin and alcian blue, and examined microscopically, comparing them with sections taken from ungrafted roots. There was a significant decrease in number of pericyclic fibers, vascular vessels and tyloses in ... more

N. Bomfim; D.G. Ribeiro; N.M.A. Nassar
04/05/2011
Manihot esculenta; Manihot fortalezensis; Manihot glaziovii; Primary growth; Xylem poles

An anatomical study of roots was conducted on two wild Manihot species, namely M. glaziovii and M. fortalezensis, and two cassava varieties, M. esculenta Crantz variety UnB 201 and M. esculenta variety UnB 122, to identify taxonomic differences in primary growth. Anatomical characters of cassava roots have been rarely investigated. Their study ... more

N.N. Bomfim; D. Graciano-Ribeiro; N.M.A. Nassar
02/10/2014
Interspecies epigenetic interaction; Manihot fortalezensis; Root size; Starch quality; Stem apical meristem; Wild Manihot

Plant periclinal chimeras are genotypic mosaics arranged concentrically. Trials to produce them to combine different species have been done, but pratical results have not been achieved. We report for the second time the development of a very productive interspecific periclinal chimera in cassava. It has very large edible roots up to 14 kg per plant at one year old compared to 2-3 kg in ... more

N. Bomfim; N.M.A. Nassar
09/25/2015
Castanea mollissima; Dryocosmus kuriphilus; Phenylalanine ammonia-lyase; Resistance

The resistance of Castanea mollissima Shuhe-WYL strain to Dryocosmus kuriphilus and its molecular mechanism were examined. The larvae of D. kuriphilus were inoculated on the Shuhe-WYL and Qingzha strains, and mortality was observed and compared; the relative mRNA content of the OsCDPK2, receptor-like protein, OsNAC6 protein, KH ... more

G.M. Geng; C.C. Zhu; J.Y. Zhou
12/16/2015
Eggplant; Genetic variation; Phomopsis blight; Random amplified polymorphic DNA; Resistance

Disease susceptibility and genetic variability in 10 eggplant genotypes were studied after inoculating Phomopsis vexans under confined field conditions. Random amplified polymorphic DNA (RAPD) markers were used to assess genetic variation and relationships among eggplant genotypes. The disease index of leaves ranged 0.208-13.79%, while fruit infection ranged 2.15-42.76%. Two varieties ... more

H.A. Asad; M.B. Meah; S.N. Begum; M.I. Khalil; M.Y. Rafii; M.A. Latif
03/24/2016
Repellence test; Behavior; Resistance; S. lycopersicum var. cerasiforme

Several studies have been conducted on resistance sources to improve the genetic resistance of farm-grown tomatoes to arthropod pests, including phytophagous mites. In the present study, we evaluate the behavior of the two-spotted spider mite on different cherry tomato accessions to identify possible sources of resistance (repellent effect) to this pest. Sixty-four accessions of cherry ... more

T. Lucini; J.T.V. Resende; J.R.F. Oliveira; C.J. Scabeni; A.R. Zeist; N.C.V. Resende; T. Lucini; J.T.V. Resende; J.R.F. Oliveira; C.J. Scabeni; A.R. Zeist; N.C.V. Resende; T. Lucini; J.T.V. Resende; J.R.F. Oliveira; C.J. Scabeni; A.R. Zeist; N.C.V. Resende
01/31/2021
genetic breeding; Passion fruit; Passion fruit woodiness disease; REML/BLUP; Resistance

The woodiness disease induced by the Cowpea aphid-borne mosaic virus (CABMV) is regarded as a limiting factor for passion fruit production. We estimated genetic parameters for resistance and agronomic performance-related traits and selected genotypes resistant to CABMV in segregating populations of passion fruit. The experiment was a randomized-block ... more

S.C. Preisigke; A.P. Viana; E.A. Santos; P.Rdos Santos; N.R. Cavalcante; M. Ambrósio; J.Cde O. Freitas; R. Rodrigues