Search Results

You are looking at 1 - 10 of 977 items for :

  • genotype reaction x
  • Refine by Access: All x
Clear All
Free access

Marcos R. Sachet, Idemir Citadin, Silvia Scariotto, Idalmir dos Santos, Pedro H. Zydek, and Maria do Carmo B. Raseira

be possible to incorporate it into new peach selections ( Topp et al., 1993 ). The aim of the present research was to classify peach genotypes based on their susceptibility to BLS and to examine the correlation between bacterial reaction and

Free access

Y. Shi, C. Rom, and J.C. Correll

Disease reactions of 11 apple genotypes (Braeburn, Empire, Gala, Granny Smith, Golden Delicious, Jonathan, Jonagold, MacIntosh, Red Delicious, Red Rome and Spartan) to 3 genetically distinct bitter rot pathogens (Colletotrichum gloeosporioides [teleomorph (T) and nonteleomorph (NT)] and C. acutatum) were examined. Fruit were surface sterilized, and then inoculated either by placing a 100 ul spore suspension (2×104 spores/ml) into wounds or spraying the inoculum onto unwounded fruit. Inoculated fruit were incubated at 26C and 100% RH. Disease reactions were quantified by measuring lesion diameter and depth in wounded fruit, or counting the number of lesions on unwounded fruit. There was a significant interaction between apple genotypes and all 3 pathogenic isolates. The T isolate was the most virulent on all genotypes. In general, cultivars with the smallest lesions in the wound test had the fewest lesions in the unwounded test. Lesion number and size were significantly lower on Granny Smith, Jonagold, Jonathan, Red Delicious and Red Rome. Of the genotypes tested, Braeburn, Gala and MacIntosh apparently were the most susceptible.

Free access

J.C. Cervantes-Flores, G.C. Yencho, and E.L. Davis

Sweetpotato [Ipomoea batatas (L.) Lam.] genotypes were evaluated for resistance to North Carolina root-knot nematode populations: Meloidogyne arenaria (Neal) Chitwood races 1 and 2; M. incognita (Kofoid & White) Chitwood races 1, 2, 3, and 4; and M. javanica (Treub) Chitwood. Resistance screening was conducted using 150-cm3 Conetainers containing 3 sand: 1 soil mix. Nematode infection and reproduction were assessed as the number of egg masses produced by root-knot nematodes per root system. Host suitability for the root-knot nematode populations differed among the 27 sweetpotato genotypes studied. Five genotypes (`Beauregard', L86-33, PDM P6, `Porto Rico', and `Pelican Processor') were selected for further study based on their differential reaction to the different root-knot nematodes tested. Two African landraces (`Tanzania' and `Wagabolige') were also selected because they were resistant to all the nematode species tested. The host status was tested against the four original M. incognita races, and an additional eight populations belonging to four host races, but collected from different geographical regions. The virulence of root-knot nematode populations of the same host race varied among and within sweetpotato genotypes. `Beauregard', L86-33, and PDM P6 were hosts for all 12 M. incognita populations, but differences in the aggressiveness of the isolates were observed. `Porto Rico' and `Pelican Processor' had different reactions to the M. incognita populations, regardless of the host race. Several clones showed resistance to all M. incognita populations tested. These responses suggest that different genes could be involved in the resistance of sweetpotato to root-knot nematodes. The results also suggest that testing Meloidogyne populations against several different sweetpotato hosts may be useful in determining the pathotypes affecting sweetpotato.

Free access

Amnon Levi, William P. Wechter, Karen R. Harris, Angela R. Davis, and Zhangjun Fei

et al., 2001 , 2006b , 2009 ), which may not be readily detected by random primers. In fact, DNA polymorphism among watermelon cultivars could be detected with expressed sequence tag (EST)-polymerase chain reaction (PCR) and sequence

Full access

Brian M. Irish, Ricardo Goenaga, Sirena Montalvo-Katz, Bernardo Chaves-Cordoba, and Inge Van den Bergh

International to field-evaluate, under the framework of the IMTP, a set of promising banana hybrids and cultivar genotypes for their host reaction to BLS and to assess their agronomic traits and production potential. Materials and Methods Plant material. Nine

Free access

Kadir Uğurtan Yılmaz, Sezai Ercişli, Bayram Murat Asma, Yıldız Doğan, and Salih Kafkas

Institute of Ministry of Agriculture in the Malatya province of Turkey. Table 1. Cultivars/genotypes of Prunus assayed with intersimple sequence repeat markers in the present study. DNA extraction and polymerase chain reaction procedure. Genomic DNA was

Free access

Jianming Sun, Yiming Liu, Xianglin Li, and Bingru Huang

-tolerant genotypes (RU9) and drought-sensitive genotype (RU18). All those differentially expressed proteins in the two genotypes (photosystem I reaction center subunit II, Rubisco small subunit, GADPH and transketolase) were found to be involved in photosynthesis

Free access

Lingyun Yuan, Yujie Yuan, Shan Liu, Jie Wang, Shidong Zhu, Guohu Chen, Jinfeng Hou, and Chenggang Wang

of enzymatic reactions in the cell ( Hemantaranjan et al., 2014 ). Diminished photosynthetic capacity is a primary damage effect by HT. Therefore, research on photosynthetic capacity in vegetable plants has become a crucial approach to evaluate the

Free access

Júlia Halász, Andrzej Pedryc, Sezai Ercisli, Kadir Ugurtan Yilmaz, and Attila Hegedűs

growth analyses have led to uncertainty of the self-incompatibility genotypes for many Turkish cultivars ( Misirli et al., 2006 ). In this study, we used polymerase chain reaction (PCR) amplification of the S-RNase intron regions to determine their

Free access

Wendy K. Hoashi-Erhardt, Patrick P. Moore, Gwenyth E. Windom, and Peter R. Bristow

Methods of screening raspberries for resistance to phytophthora root rot Acta Hort. 352 569 578 Lévesque, C.A. Daubeny, H.A. 1999 Variation in reaction to Phytophthora fragariae var. rubi in raspberry genotypes