scholarly journals Different Host Plants Distinctly Influence the Feeding Ability of the Brown Citrus Aphid Toxoptera citricida

Insects ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 864
Author(s):  
Runa Zhao ◽  
Chengxu Wu ◽  
Yingqin He ◽  
Chun Yu ◽  
Jianfeng Liu ◽  
...  
Keyword(s):  
Host Plants ◽  
Total Duration ◽  
Population Development ◽  
Population Number ◽  
Susceptible Host ◽  
Rough Lemon ◽  
Crop Resistance ◽  
Valencia Orange ◽  
Citrus Junos ◽  
Toxoptera Citricida

Piercing–sucking insects are important crop pests, and an understanding of their feeding behavior and population development plays a crucial role in studying insect population dynamics and crop resistance. In our study, we examined the probing behavior of the brown citrus aphid, Toxoptera citricida, using electropenetrography and assessed its population development after 8 days on seven host plants: Yuzu, Citrus junos Sieb. ex Tanaka; Rough Lemon, C. jambhiri Lush.; ‘Luofu’ kumquat, Fortunella margarita Swingle; ‘Olinda’ valencia orange, C. sinensis (L.) Osbeck; ‘Yanxiwanlu’ Ponkan, C. reticulata Blanco; ‘Rohde Red’ valencia orange, C. sinensis; and ‘Eureka’ lemon, C. limon (L.) Osbeck. The results demonstrated that probing by the brown citrus aphid differed significantly according to the target hosts. Toxoptera citricida produced significantly more pathway activities on Eureka than on Rough Lemon and Yuzu. Toxoptera citricida spent more time from the first probe to first salivation into phloem sieve elements on Eureka compared to Yuzu. In addition, the total duration of ingestion from sieve cells of each aphid in the phloem-feeding phase was shortest on Eureka, and this was significantly shorter than that on Yuzu, Rough Lemon, Luofu, and Olinda. The population number of T. citricida on Eureka after 8 days was significantly lower than that on the other hosts. Overall, Eureka was found to have obvious resistance to T. citricida, whereas Yuzu and Rough Lemon were susceptible host plants. These results provide a theoretical basis for exploring aphid-resistant fruit tree resources using resistant varieties.

Feeding responses of the brown planthopper, Nilaparvata lugens (Stål) (Hemiptera: Delphacidae), to resistant and susceptible host-plants

1989 ◽  
Vol 79 (2) ◽  
pp. 309-318 ◽  
Author(s):  
D. E. Padgham ◽  
S. Woodhead ◽  
H. R. Rapusas
Keyword(s):  
Resistance Genes ◽  
Host Plants ◽  
Brown Planthopper ◽  
Nilaparvata Lugens ◽  
Resistance Mechanisms ◽  
Population Development ◽  
Rice Varieties ◽  
Susceptible Host ◽  
Insect Activity ◽  
Nilaparvata Lugens Stål

AbstractThe feeding responses, growth and population development of Nilaparvata lugens (Stål) are quantified on a range of twelve susceptible or resistant host-plants. Paris of rice varieties carrying the Bph1, bph2 and Bph3 resistance genes are compared as hosts for N. lugens, and it is concluded that such notations do not adequately describe the diversity of plant resistance mechanisms. Evidence is presented for resistance mechanisms involving enhanced insect activity and gustatory responses to unacceptable phloem.

Ultrastructural changes in roots of peppers resistant and susceptible to Phytophthora capsici

1995 ◽  
Vol 53 ◽  
pp. 982-983
Author(s):  
H. Ilarslan ◽  
A.S. Ustun ◽  
R. Yilmazer
Keyword(s):  
Root Rot ◽  
Host Plants ◽  
Phytophthora Capsici ◽  
Host Cells ◽  
Ultrastructural Changes ◽  
Ultrastructural Examination ◽  
Susceptible Host ◽  
Ultrastructural Studies ◽  
Foliar Blight ◽  
Crown And Root Rot

The infection by Phytophthora capsici Leonian causes foliar blight and crown and root rot of pepper plants. The ultrastructural examination of resistant and susceptible host-pathogen interactions was conducted in the pepper cultivars Ince Sivri-35, PM217, and PM702=CM 334 following inoculation with Phytophthora capsici. Responses were characterized and compared with healthy non-inoculated controls at 2,4 and 6 days after inoculation. Numerous ultrastructural studies have been made of the interaction of various host plants Phytophthora spp. No ultrastructural studies comparing the resistant and susceptible reactions of pepper cultivars to P. capsici. have been reported. It is important to examine the ultrastructural changes in inoculated and infected tissue of resistant and susceptible pepper cultivars to P. capsici. Information reported here characterizes the processes of pathogen containment in resistant interactions and compares these with the processes occuring in susceptible interactions.After 2 days in susceptible interactions, the pathogen grew intercellularly in roots, whereas in resistant interactions only a few intercellular hyphae were observed penetrating the host cells and forming haustoria.

Rootstock and scion effects on the leaf nutrient composition of citrus trees

1993 ◽  
Vol 33 (3) ◽  
pp. 363 ◽  
Author(s):  
BK Taylor ◽  
RT Dimsey
Keyword(s):  
Sweet Orange ◽  
Nutrient Composition ◽  
Poncirus Trifoliata ◽  
Navel Orange ◽  
Rangpur Lime ◽  
Rough Lemon ◽  
Valencia Orange ◽  
Citrus Rootstock ◽  
Leaf N ◽  
High Range

Four long-term citrus rootstock trials (navel orange, mandarin, Valencia orange, and lime soil trial) established at Irymple, in the Sunraysia district of Victoria, were tested for leaf nutrient composition in each of 2 years. Scion or rootstock significantly influenced leaf nutrient composition in orange and mandarin trees in all 4 trials. Poncirus trifoliata and citrange rootstocks and Ellendale tangor scion resulted in high to moderate leaf N, P, and K concentrations, while Symons sweet orange rootstock and Dancy mandarin gave low leaf nitrogen (N), phosphorus (P), and potassium (K) concentrations. Potassium concentrations of navel and Valencia oranges on rough lemon rootstock were lower than on most of the other rootstocks tested. For all rootstocks, however, leaf N, P, and K concentrations were in the high range in the navel orange and Valencia orange trials, while leaf K concentrations were in the high range in the mandarin trial. Citrange rootstocks and Ellendale scion also had higher concentrations of leaf magnesium (Mg), while Symons sweet orange, Cox sweet orange, and Rangpur lime had lower leaf Mg concentrations than other rootstocks and scions. In the Valencia rootstock trial, rough lemon and Rangpur lime induced the highest leaf sulfur concentrations, while citrange rootstocks gave the lowest. Soil depth in the lime soil trial influenced foliar P and K levels in Valencia orange trees but these differences were small. In all trials, rootstock, but not scion, strongly influenced chloride (Cl) concentrations of citrus leaves. Poncirus trifoliata rootstock accumulated high concentrations of Cl, and the citrange rootstocks moderate, while Cleopatra mandarin rootstock showed consistently low leaf C1 concentrations in all trials. Rough lemon rootstock was not consistently good at excluding C1, and Rangpur lime showed good C1 exclusion only in the Valencia rootstock trial. There was no evidence of a negative relationship between uptake of N and C1 by citrus rootstocks. Poncirus trifoliata had a lower uptake of sodium (Na) in the Valencia rootstock trial, while Cleopatra and Emperor mandarin rootstocks showed slightly higher leaf Na levels than most other rootstocks tested. The 2 citranges, mandarin, rough lemon, and Rangpur lime rootstocks induced higher boron (B) concentrations in leaves of navel orange compared with other rootstocks but they were still in the adequate range for citrus (Reuter and Robinson 1986), while sweet orange rootstocks had lower levels. Emperor mandarin scion on all rootstocks tested had the lowest B levels. Concentrations of iron and copper were rarely influenced by scion or rootstock. Rootstock significantly influenced leaf manganese (Mn) and zinc (Zn) levels in a number of trials, but scion effects were minor. In comparison with all other rootstocks, rough lemon induced higher Mn levels in some cases; sweet orange rootstocks gave higher leaf Zn levels in other cases; while Rangpur lime induced higher Mn and Zn levels in trees grown in the lime soil trial. In the first 3 trials, concentrations of Zn and Mn were low in many of the rootstocks and scions, indicating a need for a second micronutrient spray per growing season.

Natural Infection Rate of Known Tomato Chlorosis Virus-Susceptible Hosts and the Influence of the Host Plant on the Virus Relationship With Bemisia tabaci MEAM1

Plant Disease ◽  
2020 ◽  
Author(s):  
Arnaldo Esquivel-Fariña ◽  
Jorge Alberto Marques Rezende ◽  
William M. Wintermantel ◽  
Laura Jenkins Hladky ◽  
Daiana Bampi
Keyword(s):  
Infection Rate ◽  
Bemisia Tabaci ◽  
Host Plants ◽  
Natural Infection ◽  
Sao Paulo ◽  
Cultivated Plants ◽  
São Paulo ◽  
Susceptible Host ◽  
External Sources ◽  
Tomato Chlorosis Virus

Tomato chlorosis virus (ToCV; genus Crinivirus, family Closteroviridae) was identified in tomato crops in the state of São Paulo, Brazil in 2006. Management strategies to control external sources of inoculum are necessary, because chemical control of the whitefly vector Bemisia tabaci MEAM1 has not efficiently prevented virus infections and no commercial tomato cultivars or hybrids are resistant to this crinivirus. We first evaluated the natural infection rate of some known wild and cultivated ToCV-susceptible hosts and their attractiveness for B. tabaci MEAM1 oviposition. Physalis angulata was the most susceptible to natural infection in all six exposures in 2018 and 2019. No plants of Capsicum annuum (cv. Dahra) or Chenopodium album became infected. Solanum melongena (cv. Napoli) had only two infected plants of 60 exposed. C. annuum and C. album were the least preferred, and Nicotiana tabacum and S. melongena were the most preferred for whitefly oviposition. In addition, from 2016 to 2019, we surveyed different tomato crops and the surrounding vegetation to identify ToCV in weeds and cultivated plants in the region of Sumaré, São Paulo state. Only Solanum americanum, vila vila (S. sisymbriifolium) and C. album were found naturally infected, with incidences of 18%, 20% and 1.4%, respectively. Finally, we estimated the ToCV titer (isolates ToCV-FL, USA and ToCV-SP, Brazil) by RT-qPCR in different ToCV-susceptible host plants and evaluated the relationship between virus acquisition and transmission by B. tabaci MEAM1. The results clearly showed significant differences in ToCV concentrations in the tissues of ToCV-susceptible host plants, which appeared to be influenced by the virus isolate. The concentration of the virus in plant tissues, in turn, directly influenced the ToCV-B. tabaci MEAM1 relationship and subsequent transmission to tomato plants. To minimize or prevent the damage from the tomato yellowing disease through management of external sources of ToCV, it is necessary to correctly identify the potentially important ToCV-susceptible hosts in the vicinity of new plantings.

scholarly journals Tandem protein kinases emerge as new regulators of plant immunity

2021 ◽  
Author(s):  
Valentyna Klymiuk ◽  
Gitta Coaker ◽  
Tzion Fahima ◽  
Curtis Pozniak
Keyword(s):  
Immune Responses ◽  
Host Plants ◽  
Current Knowledge ◽  
Plant Immunity ◽  
Susceptible Host ◽  
Future Studies ◽  
Receptor Proteins ◽  
Pathogen Effectors ◽  
Intracellular Proteins ◽  
Plant Pathogen Interactions

Plant-pathogen interactions result in disease development in a susceptible host. Plants actively resist pathogens via a complex immune system comprised of both surface-localized receptors that sense the extracellular space as well as intracellular receptors recognizing pathogen effectors. To date, the majority of cloned resistance genes encode intracellular nucleotide-binding leucine-rich repeat (NLR) receptor proteins. Recent discoveries have revealed Tandem Kinase Proteins (TKPs) as another important family of intracellular proteins involved in plant immune responses. Five TKP genes, barley Rpg1 and wheat WTK1 (Yr15), WTK2 (Sr60), WTK3 (Pm24), and WTK4 protect against devastating fungal diseases. Moreover, a large diversity and numerous putative TKPs exist across the plant kingdom. This review explores our current knowledge of TKPs and serves as a basis for future studies that aim to develop and exploit a deeper understanding of innate plant immunity receptor proteins.

scholarly journals Uptake Patterns of 11 Elements of Orange Trees in Solution Culture

HortScience ◽  
1997 ◽  
Vol 32 (3) ◽  
pp. 486B-486
Author(s):  
H.K. Wutscher
Keyword(s):  
Nutrient Solution ◽  
Citrus Sinensis ◽  
Soil Extract ◽  
Solution Culture ◽  
Field Soil ◽  
Rough Lemon ◽  
Valencia Orange ◽  
Orange Trees ◽  
Solution Change ◽  
Complete Nutrient Solution

Three trees each of `Valencia' orange (Citrus sinensis L. Osbeck) on rough lemon (C. limon L. Burm. f.) rootstocks that had been grown in solution culture since July 1989 were grown in two solutions from Oct. 1995 to Sept.1996. Solution 1 was a soil extract made by boiling field soil (1:2 soil:water) for 20 min and filtering. Solution 2 was a complete nutrient solution. The solutions were analyzed every 7 days and changed every 28 days. At each solution change, the newly prepared solutions were analyzed for 11 elements and their depletion was determined by weekly analysis. Nearly all the N, K, and Mn in Solution 1 was absorbed in the first 7 days after each solution change; in Solution 2, N and Mn were also absorbed in 7 days, but K absorption was variable; single trees sometimes needed 4 weeks to absorb all the potassium. Calcium and Mg were never completely absorbed and in contrast to Mn, traces of Fe, Zn, and Cu remained in both solutions after 4 weeks.

scholarly journals Distinct Transcriptional Programs Underlie Differences in Virulence of Isolates on Host Plants in a Fungal Pathogen, Colletotrichum gloeosporioides

2021 ◽  
Vol 12 ◽  
Author(s):  
Wonsu Cheon ◽  
Young Soo Kim ◽  
Kotnala Balaraju ◽  
Younmi Lee ◽  
Hyeok Tae Kwon ◽  
...  
Keyword(s):  
Fungal Pathogens ◽  
Host Plants ◽  
Colletotrichum Gloeosporioides ◽  
Isocitrate Lyase ◽  
Glyoxylate Cycle ◽  
Virulence Gene ◽  
Rna Seq ◽  
Susceptible Host ◽  
Factors Affecting ◽  
Different Types

Susceptible host plants challenged by fungal pathogens can display different types of lesions, which can be attributed to environmental factors affecting the nature of interactions between the host and pathogen. During our survey of apple anthracnose in Korea, two distinct types of disease symptoms, designated as progressive (PS) and static symptoms (SS), were recognized. PS is a typical, rapidly enlarging symptom of apple anthracnose, while SS is a small, dark speck that does not expand further until the harvesting season. Isolation and genotyping of pathogens from disease lesions suggested that all of them belong to Colletotrichum gloeosporioides, a well-known causal agent of apple anthracnose. Two types of isolates were comparable in growth on media, spore germination and appressorium formation, virulence test on fruits at various temperature conditions. Furthermore, they were analyzed at the molecular level by a phylogenetic tree, RNA-seq, and expression of virulence gene. However, the SS isolates were defective in appressorium-mediated penetration into the underlying substratum. RNA-seq analysis of PS and SS isolates showed that distinct transcriptional programs underlie the development of different types of anthracnose symptoms in host plants. One downregulated gene in SS encoded isocitrate lyase is essential for disease development via its involvement in the glyoxylate cycle. It partly explains why SS is less virulent than PS on host plants. Overall, our work challenges the traditional view on the development of different lesion types and provides valuable insights into variations that exist in the pathogen population.

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